12th Standard Physics State Board (Tamilnadu) - study material, free online tests, previous year question papers, answer keys, topper answers, centum question paper, exam tips

TN 11th Physics Gravitation Important 2 Marks Questions With Answers Book Back and Creative - by Sneha - Jul 31, 2024 - View & Read

TN 12th Physics Wave Optics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 27, 2024 - View & Read

TN 12th Physics Recent Developments in Physics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 27, 2024 - View & Read

TN 12th Physics Ray Optics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 27, 2024 - View & Read

TN 12th Physics Magnetism and Magnetic Effects of Electric Current Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 27, 2024 - View & Read

TN 12th Physics Wave Optics Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Recent Developments in Physics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Recent Developments in Physics Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Ray Optics Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Magnetism and Magnetic Effects of Electric Current 50 Important 1 Marks Questions With Answers( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electrostatics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electrostatics 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electronics and Communication Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electronics and Communication 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electromagnetic Waves Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electromagnetic Waves 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electromagnetic Induction and Alternating Current Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Dual Nature of Radiation and Matter Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Current Electricity Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Atomic and Nuclear physics Important 2 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Electromagnetic Induction and Alternating Current 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Dual Nature of Radiation and Matter 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 24, 2024 - View & Read

TN 12th Physics Current Electricity 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 23, 2024 - View & Read

TN 12th Physics Atomic and Nuclear physics 50 Important 1 Marks Questions With Answers ( Book Back and Creative ) - by Sneha - Jul 23, 2024 - View & Read

12th Standard English Medium Physics Subject Electrostatics Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.
2)
Four charges are arranged at the corners of the square PQRS of side an as shown in the figure.
(a) Find the work required to assemble these charges in the given configuration.
(b) Suppose a charge q is brought to the center of the square, by keeping the four charges fixed at the corners, how much extra work is required for this?
3)
Calculate the electric flux through the rectangle of sides 5 cm and 10 cm kept in the region of a uniform electric field 100 NC^-1. The angle θ is 60°. If θ becomes zero, what is the electric flux?
4)
A small ball of conducting material having a charge +q and mass m is thrown upward at an angle θ to horizontal surface with an initial speed v_o as shown in the figure. There exists an uniform electric field E downward along with the gravitational field g. Calculate the range, maximum height and time of flight in the motion of this charged ball. Neglect the effect of air and treat the ball as a point mass.
5)
A parallel plate capacitor filled with mica having ε_r = 5 is connected to a 10 V battery. The area of the parallel plate is 6 cm² and separation distance is 6 mm.
(a) Find the capacitance and stored charge.
(b) After the capacitor is fully charged, the battery is disconnected and the dielectric is removed carefully.
Calculate the new values of capacitance, stored energy and charge.

12th Standard English Medium Physics Subject Electrostatics Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Consider an electron travelling with a speed v_o and entering into a uniform electric field \(\vec{E}\) which is perpendicular to \(\vec { { v }_{ 0 } } \) as shown in the Figure. Ignoring gravity, obtain the electron’s acceleration, velocity and position as functions of time.
2)
The electrostatic potential is given as a function of x in figure (i) and (ii). (a) Calculate the corresponding electric fields in regions A, B, C and D for the Figure (i). (b) Plot the electric field as a function of x for the figure (ii).
3)
A point charge of +10 μC is placed at a distance of 20 cm from another identical point charge of +10 μC. A point charge of -2 μC is moved from point a to b as shown in the figure. Calculate the change in potential energy of the system? Interpret your result.
4)
An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage 5 V and separation distance h = 1 mm as shown in the figure.

(a) Calculate the time of flight for both electron and proton
(b) Suppose if a neutron is allowed to fall, what is the time of flight?
(c) Among the three, which one will reach the bottom first? (Take m_p = 1.6 x 10^-27 kg, m_e = 9.1 x 10^-31 kg and g = 10 m s^-2)
5)
For the given capacitor configuration
(a) Find the charges on each capacitor
(b) potential difference across them
(c) energy stored in each capacitor

12th Standard English Medium Physics Subject Current Electricity Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will get fused?
2)
From the given circuit,

Find
i) Equivalent emf of the combination
ii) Equivalent internal resistance
iii) Total current
iv) Potential difference across external resistance
v) Potential difference across each cell
3)
For the given circuit find the value of I.
4)
Calculate the current that flows in the 1 Ω resistor in the following circuit.
5)
What is the value of x when the Wheatstone’s network is balanced?
P = 500 Ω, Q = 800 Ω, R = x + 400, S = 1000 Ω

12th Standard English Medium Physics Subject Current Electricity Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A battery has an emf of 12 V and connected to a resistor of 3 Ω. The current in the circuit is 3.93 A. Calculate
(a) terminal voltage and the internal resistance of the battery
(b) power delivered by the battery and power delivered to the resistor
2)
For the given circuit

Find
i) Equivalent emf
ii) Equivalent internal resistance
iii) Total current (I)
iv) Potential difference across each cell
v) Current from each cell
3)
The following figure shows a complex network of conductors which can be divided into two closed loops like EACE and ABCA. Apply Kirchoff’s voltage rule(KVR)
4)
In a Wheatstone’s bridge P = 100 Ω, Q = 1000 Ω and R = 40 Ω. If the galvanometer shows zero deflection, determine the value of S.
5)
In a meter bridge experiment with a standard resistance of 15 Ω in the right gap, the ratio of balancing length is 3:2. Find the value of the other resistance.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A particle of charge q moves with velocity\(\vec { v } \) along positive y-direction in a magnetic field \(\vec { B } \) .Compute the Lorentz force experienced by the particle
(a) when magnetic field is along positive y - direction
(b) when magnetic field points in positive z - direction
(c) when magnetic field is in zy - plane and making an angle θ with velocity of the particle. Mark the direction of magnetic force in each case
2)
An electron moving perpendicular to a uniform magnetic field 0.500 T undergoes circular motion of radius 2.50 mm. What is the speed of electron?
3)
Two singly ionized isotopes of uranium \(_{ 92 }^{ 235 }{ U \ and \ _{ 92 }^{ 238 }{ U } }\) (isotopes have same atomic number but different mass number) are sent with velocity 1.00 x 10⁵ m s^–1 into a magnetic field of strength 0.500 T normally. Compute the distance between the two isotopes after they complete a semi-circle. Also, compute the time taken by each isotope to complete one semi-circular path. (Given: masses of the isotopes: m₂₃₅ = 3.90 x 10^–25 kg and m₂₃₈ = 3.95 x 10^–25 kg)
4)
Suppose a cyclotron is operated to accelerate protons with a magnetic field of strength 1 T. Calculate the frequency in which the electric field between two Dees could be reversed.
5)
Consider a circular wire loop of radius R, mass m kept at rest on a rough surface. Let I be the current flowing through the loop and be the magnetic field acting along horizontal as shown in Figure. Estimate the current I that should be applied so that one edge of the loop is lifted off the surface?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Show that for a straight conductor, the magnetic field
\(\overset { \rightarrow }{ B } =\frac { { \mu }_{ ° }I }{ 4\pi a } (cos\varphi _{ 1 }-cos\varphi _{ 2 })\hat { n } \)
\(=\frac { { \mu }_{ ° }I }{ 4\pi a } (sin{ \theta }_{ 1 }+sin{ \theta }_{ 2 })\hat { n } \)
2)
Compute the magnitude of the magnetic field of a long, straight wire carrying a current of 1 A at distance of 1m from it. Compare it with Earth’s magnetic field.
3)
A particle of charge q moves with velocity\(\vec { v } \) along positive y-direction in a magnetic field \(\vec { B } \) .Compute the Lorentz force experienced by the particle
(a) when magnetic field is along positive y - direction
(b) when magnetic field points in positive z - direction
(c) when magnetic field is in zy - plane and making an angle θ with velocity of the particle. Mark the direction of magnetic force in each case
4)
An electron moving perpendicular to a uniform magnetic field 0.500 T undergoes circular motion of radius 2.50 mm. What is the speed of electron?
5)
Two singly ionized isotopes of uranium \(_{ 92 }^{ 235 }{ U \ and \ _{ 92 }^{ 238 }{ U } }\) (isotopes have same atomic number but different mass number) are sent with velocity 1.00 x 10⁵ m s^–1 into a magnetic field of strength 0.500 T normally. Compute the distance between the two isotopes after they complete a semi-circle. Also, compute the time taken by each isotope to complete one semi-circular path. (Given: masses of the isotopes: m₂₃₅ = 3.90 x 10^–25 kg and m₂₃₈ = 3.95 x 10^–25 kg)

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The 300 turn primary of a transformer has resistance 0.82 Ω and the resistance of its secondary of 1200 turns is 6.2 Ω. Find the voltage across the primary if the power output from the secondary at 1600V is 32 kW. Calculate the power losses in both coils when the transformer efficiency is 80%.
2)
A graph between the magnitude of the magnetic flux linked with a closed loop and time is given in the figure. Arrange the regions of the graph in ascending order of the magnitude of induced emf in the loop.
3)
A flexible metallic loop abcd in the shape of a square is kept in a magnetic field with its plane perpendicular to the field. The magnetic field is directed into the paper normally. Find the direction of the induced current when the square loop is crushed into an irregular shape as shown in the figure.
4)
In series LC circuit, the voltages across L and C are 180° out of phase. Is it correct? Explain.
5)
Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
If the particle of a solid is of size less than 100 nm, it is said to be a ____________
2)
_______ is synthesized top down approach
3)
George Devel invented the first digitally operated programmable robot called ____________.
4)
The size of the Nano robots is reduced to ________ level to perform a task in very small space.
5)
In __________ it was established that atoms are made up of electrons, protons and neutrons

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An ideal transformer has 460 and 40,000 turns in the primary and secondary coils respectively. Find the voltage developed per turn of the secondary if the transformer is connected to a 230 V AC mains. The secondary is given to a load of resistance 10⁴ Ω. Calculate the power delivered to the load.
2)
Write down the equation for a sinusoidal voltage of 50 Hz and its peak value is 20 V. Draw the corresponding voltage versus time graph.
3)
The equation for an alternating current is given by i = 77 sin 314t. Find the peak current, frequency, time period and instantaneous value of current at t = 2 ms.
4)
A capacitor of capacitance \(\\ \frac { { 10 }^{ 2 } }{ \pi } \mu F\\ \) is connected across a 220 V, 50 Hz A.C. mains. Calculate the capacitive reactance, RMS value of current and write down the equations of voltage and current.
5)
A series RLC circuit which resonates at 400 kHz has 80 μH inductors, 2000 pF capacitor and 50 Ω resistor. Calculate
(i) Q-factor of the circuit
(ii) the new value of capacitance when the value of inductance is doubled and
(iii) the new Q-factor.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 x 10⁴N C^–1 and 2 x 10^–4 T, respectively.
2)
Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.
3)
A pulse of light of duration 10⁻⁶s is absorbed completely by a small object initially at rest. If the power of the pulse is 60\(\times\) 10⁻³ W. Calculate the final momentum of the object.
4)
Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y-direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.
5)
If the relative permeability and relative permittivity of a medium are 1.0 and 2.25 respectively, find the speed of the electromagnetic wave in this medium.

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Best example for applications of nanotechnology is ______________.
2)
Muscle wires can contract by _________ when electric current is passed through them.
3)
Chinese scientists have created the world's first autonomous _________ to combat caner tumours.
4)
Zno is an example of __________
5)
Bulk particles of nanoparticles are synthesized by ___________

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 x 10⁴N C^–1 and 2 x 10^–4 T, respectively.
2)
A magnetron in a microwave oven emits electromagnetic waves (em waves) with frequency f = 2450 MHz. What magnetic field strength is required for electrons to move in circular paths with this frequency?
3)
Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.
4)
A transmitter consists of LC circuit with an inductance of 1 µH and a capacitance of 1 µF. What is the wavelength of the electromagnetic waves it emits?
5)
Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y-direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.

12th Standard English Medium Physics Subject Electronics and Communication Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The behaviour of Ge as semi-conductor is due to width of ___________.
2)
For a transistor \(\frac{I_C}{I_E}\) = 0.96, then CE current gain is ______________.
3)
In Si-crystal, impurity donor atom have valency ________________.
4)
A full wave rectifier is operating at 50 Hz, 220v the fundamental frequency of ripple will be __________.
5)
Digital circuits can be made to be respective use of ______________.

12th Standard English Medium Physics Subject Ray Optics Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two polaroids are kept with their transmission axes inclined at 30^o. Unpolarised light of intensity I falls on the first polaroid. Find out the intensity of light emerging from the second polaroid.
2)
Find the polarizing angles for
(i) glass of refractive index 1.5 and
(ii) water of refractive index 1.33.
3)
A man with a near point of 25 cm reads a book which has small print using a magnifying lens of focal length 5 cm.
(a) What are the closest and the farthest distances at which he should keep the lens from the book?
(b) What are the maximum and the minimum magnification possible?
4)
A small telescope has an objective lens of focal length 125 cm and an eyepiece of focal length 2 cm.
(a) What is the magnification of the telescope?
(b) What is the separation between the objective and the eyepiece?
(c) What is the angular separation between two stars when viewed through this telescope if they subtend 1' for bare eye?
5)
A person has farsightedness with the far distance he could see clearly is 75 cm. Calculate the power of the lens of the spectacles needed to rectify the defect.

12th Standard English Medium Physics Subject Electronics and Communication Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In FM, frequency variation of the carrier wave depends upon the ___________ amplitude of the signal.
2)
The change in the resting frequency of a FM transmitter is called ________
3)
FM signal has a resting frequency of 105 MHz and the highest frequency of 105.03 MHz when modulated by a signal. Then the carrier swing is ____________.
4)
In FM, the centre frequency is allotted to the _________.
5)
Noise is a form of __________ variation.

12th Standard English Medium Physics Subject Ray Optics Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the object distance if the image obtained is magnified 4 times.
2)
An object is placed in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.
3)
A thin converging lens of refractive index 1.5 has a power of + 5.0 D. When this lens is immersed in a liquid of refractive index n, it acts as a divergent lens of focal length 100 cm. What must be the value of n?
4)
In Young's double-slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two-wavelength λ₀= 750 nm and λ = 900mm. What is the minimum distance from the common central bright fringe on a screen 2 m from the slits where a bright fringe from one interference pattern coincides with a . bright fringe from the other?
5)
Two light sources with amplitudes 5 units and 3 units respectively interfere with each other. Calculate the ratio of maximum and minimum intensities.

12th Standard English Medium Physics Subject Electrostatics Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are induced dipoles.
2)
What is a Capacitor?
3)
(i) Two insulated charged copper spheres A & B of identical size have charges qn and -3q_A respectively. When they are brought in contact with each other and then separated. What are the new charges on them?
(ii) When third sphere of some size but uncharged is brought in contact with first and then second and finally removed? What are the new charges.
4)
A charge Q μC is placed at the centre of a cube what would be the
(i) flux through one face?
(ii) flux passing through two opposite faces of the cube?
Electric flux through whole cube \(\frac { Q }{ { \varepsilon }_{ 0 } } \)
5)
(i) Electric field lines donot have sudden breaks why is it so?
(ii) Explain why two field lines never cross each other at any point.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
At the given point of time, the earth receives energy from sun at 4 cal cm^–2min^–1. Determine the number of photons received on the surface of the Earth per cm² per minute. (Given: Mean wavelength of sun light = 5500 Å )
2)
Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10^–15 J. (Given: mass of proton is 1836 times that of electron).
3)
The ratio between the de Broglie wavelength associated with proton, accelerated through a potential of 512 V and that of alpha particle accelerated through a potential of X volts is found to be one. Find the value of X.
4)
Find the de Broglie wavelength associated with an alpha particle which is accelerated through a potential difference of 400 V. Given that the mass of the proton is 1.67 x 10^–27kg.
5)
Calculate the cut-off wavelength and cutoff frequency of x-rays from an x-ray tube of accelerating potential 20,000 V.

12th Standard English Medium Physics Subject Electrostatics Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is the work zone by the field in moving a small positive charge from A to P? Given reason.
2)
What are the factors on which the capacity of a parallel plate capacitor with dielectric depend?
3)
The graph shown here shows the variation of total energy (E) stored in a capacitor against the value of the capacitance (c) itself. Which of the two is kept constant for this graph, whatever the charge an capacitor of the potential used to charge it?
4)
Gauss law is true for any closed surface, no matter what its shape or size is. Justify.
5)
The given graph shows the variation of charge q versus potential difference V for 2 capacitors C, & C₂. The two capacitors have same plate separation but the area of plate C₂, is twice that of C₁, which of the two graphs P & Q correspond to capacitors C₁ & C₂, why?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the maximum kinetic energy and maximum velocity of the photoelectrons emitted when the stopping potential is 81 V for the photoelectric emission experiment.
2)
A 150 W lamp emits light of mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.
3)
What should be the velocity of the electron so that its momentum equals that of 4000 Å wavelength photon.
4)
When a 6000Å light falls on the cathode of a photo cell, photoemission takes place. If a potential of 0.8 V is required to stop emission of electron, then determine the
(i) frequency of the light
(ii) energy of the incident photon
(iii) work function of the cathode material
(iv) threshold frequency and
(v) net energy of the electron after it leaves the surface.
5)
At the given point of time, the earth receives energy from sun at 4 cal cm^–2min^–1. Determine the number of photons received on the surface of the Earth per cm² per minute. (Given: Mean wavelength of sun light = 5500 Å )

12th Standard English Medium Physics Subject Current Electricity Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Distinguish between ohmic & non-ohmic device.
2)
What is the effective resistance of resistors connected in series?
3)
Define the term electric power and circuit its SI unit.
4)
Define electric energy state its commercial units.
5)
What do you mean by a series combination of cells?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the radius of the earth if the density of the earth is equal to the density of the nucleus.[mass of earth 5.97 x 10²⁴ kg].
2)
Half lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. Calculate the ratio of decayed numbers of A and B nuclei after 80 minutes.
3)
Calculate the time required for 60% of a sample of radon undergo decay. Given T_1/2of radon = 3.8 days.
4)
Show that the mass of radium \((_{ 88 }^{ 226 }{ Ra })\) with an activity of 1 curie is almost a gram. Given T_1/2 = 1600 years.
5)
Compute the binding energy of \(_{ 2 }^{ 4 }{ He }\) nucleus using the following data: Atomic mass of Helium atom M_A(He) = 4.00260u and that of hydrogen atom, m_H= 1.00785u.

12th Standard English Medium Physics Subject Current Electricity Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What happens to the drift velocity of electron and to the resistance if length of conductor and to the resistance if length of conductor unchanged?
2)
Draw V - I graph for ohmic & non -ohmic materials. Give example.
3)
Mention are limitation of carbon resistors.
4)
Two wires A & B are of the same metal of the same length have area of the cross-section in the ratio of 2: 1. If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?
5)
Show variation of resistivity of
(i) conductor (i.e. copper)
(ii) semiconductor
(ii) with temperature in a graph. Give reason.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Consider two hydrogen atoms H_A and H_B in ground state. Assume that hydrogen atom H_A is at rest and hydrogen atom H_B is moving with a speed and make head-on collision with the stationary hydrogen atom H_A. After the collision, both of them move together. What is minimum value of the kinetic energy of the moving hydrogen atom H_B, such that any one of the hydrogen atoms reaches first excitation state.
2)
(a) A hydrogen atom is excited by radiation of wavelength 97.5 nm. Find the principal quantum number of the excited state
(b) Show that the total number of lines in emission spectrum is \(\frac { n(n-1) }{ 2 } \) Compute the total number of possible lines in emission spectrum as given in(a).
3)
Calculate the mass defect and the binding energy per nucleon of the \(_{ 47 }^{ 108 }{ Ag }\) nucleus. [atomic mass of Ag = 107.905949]
4)
On your birthday, you measure the activity of the sample ²¹⁰Bi which has a half-life of 5.01 days. The initial activity that you measure is 1µCi.
(a) What is the approximate activity of the sample on your next birthday? Calculate
(b) the decay constant
(c) the mean life
(d) initial number of atoms.
5)
Assuming that energy released by the fission of a single \(_{ 92 }^{ 235 }{ U }\) nucleus is 200MeV, calculate the number of fissions per second required to produce 1-watt power.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the Similarities between Coulomb's law and Biot-Savort's law.
2)
What is magnetic Lorentz force?
3)
What is Cyclotron? State the principle of Cyclotron.
4)
When is a galvanometer said to be sensitive?
5)
State the factors on which the current sensitivity of a galvanometer is increased.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The current gain of a common emitter transistor circuit shown in figure is 120. Draw the DC load line and mark the Q point on it. (V_BEto be ignored).
2)
Calculate the range of the variable capacitor that is to be used in a tuned-collector oscillator which has a fixed inductance of 150 μH. The frequency band is from 500 kHz to 1500 kHz.
3)
What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?
4)
In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.
5)
Prove the Boolean identity AC + ABC = AC and give its circuit description.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
State the factors on which the current sensitivity of a galvanometer is increased.
2)
Define Voltage sensitivity?
3)
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic when kept in an external magnetic field?
4)
What is magnetic Lorentz force?
5)
The magnetic field lines prefer to pass through iron than why?

12th Standard English Medium Physics Subject Electronics and Communication Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R₁.
2)
Four silicon diodes and a 10 Ω resistor are connected as shown in figure below. Each diode has a resistance of 1Ω. Find the current flows through the 10Ω resistor.
3)
A transistor having α = 0.99 and V_BE = 0.7V, is connected in the common-cmiitter configuration as shown in figure. If the transister is in saturation region, find the value of the collector current.
4)
In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter-base voltage V_EB = 600 mV, calculate the emitter-collector voltage V_EC(in volts).

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the application of series RLC resonant circut
2)
What is the signifienance of Quality factor or Q-factor.
3)
Define power factor?
4)
State the law that gives the polarity of the induced emf.
5)
Find the direction of the induced current in the rectangular loop P&RS is moving into a uniform magnetic field acting at right angles to the plane of the paper.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain the use of transformers in long distance transmission of electric power.
2)
What is meant by Sinusoidal alternating voltage and current? Give its expression.
3)
Distinguish between AC and DC.
4)
Draw a graph showing variation of current with changing frequency of applied voltage in a series LCR circuit for two different values of resistance R1 & R2 (I₁ > I₂) fr - resonant frequency.
5)
When does the phenomenon of resonance is possibble in the circuit?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the uses of Radio waves.
2)
(i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and
(ii) Do Electromagnetic waves carry energy and momentum?
3)
Arrange the Electromagnetic waves in order of
(i) increasing frequency
(ii) decreasing wavelength.
4)
Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?
5)
Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the uses of Micro waves.
2)
(i) In which situation is there a displacement current but no conduction current?
(ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.
3)
Why are Infrared radiation referred to as heatwaves? Name the radiations, which are next to these radiation having
(i) shorter λ
(ii) longer λ.
4)
Which part of Electromagnetic is absorbed from sunlight by ozone layer?
(i) Write its source and
(ii) mention its uses.
5)
What is the orgin of displacement currtent?

12th Standard English Medium Physics Subject Ray Optics Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Define centre of curvature.
2)
Define pole.
3)
What is meant by focal plane?
4)
What are the assumptions made while considering refraction at spherical surfaces?
5)
What is simultaneous reflection?

12th Standard English Medium Physics Subject Ray Optics Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled?
2)
The image of a candle formed by a convex lens is obtained on a screen. Will full size of the image be obtained if the lower half of the lens is painted completely opaque?
3)
For the same angle of incidence, the angles of refraction in media P, Q and R are 35°, 25°, 15° respectively. In which medium will the velocity of light be minimum?
4)
The image of an object formed by a lens on the screen is not in sharp focus. Suggest a method to get a dear focussing of the image on the screen without disturbing the positions of the object, the lens or the screen.
5)
A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the surfaces of the lens facing the object and image are interchanged will the position of the image change?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Work function of aluminium is 4.2 eV. If two photons, each of energy 2.5 eV, are incident on It surtace, will the emission of electrons take place? Justify your answer
2)
Define the term 'stopping potential' in relation to photoelectric effect.
3)
The stopping potential in an experiment on photoelectric effect is 2V. What is the maximum kinetic energy of the photoelectrons emitted?
4)
Define intensity of radiation on the basis of photon picture of light. Write its SI unit.
5)
If the intensity of radiation in a photocell is increased how does the stopping potential vary?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Does the stopping potential in photoelectric emission depend upon
(i) the intensity of the incident radiation in a photocell
(ii) the frequency of the incident radiation?
2)
With what purpose was famous Davisson-Germer experiment with electrons performed?
3)
Which of the two :
(i) light or
(ii) moving material particle is concerned with de-Broglie hypothesis?
4)
If the intensity of light falling on a metal plate is doubled, what will be the effect on photocurrent and maximum kinetic energy of emitted photoelectrons?
5)
The de Broglie wavelength associated with an electron accelerated through a potential difference V is λ. What will be its wavelength when the accelerating potential is increased to 4V?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Why neutrons in the nucleus are stable?
2)
What causes the sun to expand?
3)
The ground state energy of hydrogen atom is -13.6 eV. What are k.E & P.E of the electron in this state?
4)
What are thermal neutrons? Why are neutrons considered as ideal particles for nuclear fission?
5)
Give the mass number and atomic number of elements on the right-hand side of the decay process \(_{ 86 }^{ 220 }{ Rn }\) ⇾ Po + He.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Which ray has high ionising power? Why?
2)
What is nuclear chain reaction?
3)
What are the essential parts of a nuclear reactor?
4)
Define Roentgen.
5)
What is the reason for using lighter nuclei as moderators?

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are God particles?
2)
Write thekey components of robot.
3)
What is the use of industrial robots?
4)
Define nano solid?
5)
What is use of robotics?

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is the two important phenomena that govern the nano particles?
2)
How does the manipulation of colours obtain in nanoscale structure?
3)
What is the use of nano paints?
4)
Who invented Unimate?
5)
What are the material used to make robots?

12th Standard Physics English Medium Electrostatics Important Questions updated Sample Question Papers - by Question Bank Software - May 13, 2022 - View & Read

1)
Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?
2)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
3)
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = V_o – V_A, where V_o is the potential at the origin and V_A is the potential at x = 2 m is _____.
4)
Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is
5)
The electrostatic force obeys _______.

12th Standard English Medium Physics Subject Wave Optics Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Why is the interference pattern not detected when two coherent sources are far apart?
2)
A telescope has been adjusted for relaxed eye. You are asked to adjust it for least distance of distinct vision, then how will you change the distance between two lenses?
3)
Does the magnifying power of a microscope depend on the colour of the light used? Justify your answer.
4)
How does the fringe width of interference fringes change, when the whole apparatus Young's experiment is kept in water (refractive index 4/3)?
5)
What are coherent sources of light?

12th Standard English Medium Physics Subject Wave Optics Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is astigmatism? What is its remedy?
2)
What is known as constructive interference?
3)
Define bandwidth.
4)
Write the expression for angular resolution.
5)
Define interference of light.

12th Standard English Medium Physics Subject Electronics and Communication Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is barrier potential?
2)
Define forward bias.
3)
What is forward V-I characteristics?
4)
What is meant by efficiency (η)?
5)
Mention any three application Zener diode.

12th Standard English Medium Physics Subject Electronics and Communication Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What do you mean by communication?
2)
Write the function of Repeater.
3)
Why sky waves are not used in the transmission of T.V. signals?
4)
What is modulated wave?
5)
What do you mean by noise in communication?

12th Standard English Medium Physics Subject Electrostatics Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Define potential difference and derive.
2)
How is electric flux is related to electric field.
3)
Deduce electric flus for closed surfaces.
4)
What is dielectrics or insulators.
5)
Define and derive an expression for the energy density in parallel plate capacitor.

12th Standard English Medium Physics Subject Electrostatics Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Deduce an expression for the electric field due to the system of point charges.
2)
What is principle used in Microwave oven? Explain.
3)
Derive the expressions for the potential energy of a system of point charges.
4)
Derive an expression for electric flus in a non uniform electric field and an arbitrarily shaped area.
5)
Write the special features of Gauss law.

12th Standard English Medium Physics Subject Current Electricity Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Derive an expression of drift velocity and write the relation between drift velocity and mobility.
2)
(a) Distinguish between electric cells and batteries.
(b) Explain its function.
3)
Derive a relation between internal resisance and emf of a cell.
4)
Find the expression for the equivalent emf & internal resistance of the series combination of cells.
5)
Explain Peltier effect.

12th Standard English Medium Physics Subject Current Electricity Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are carbon resistors? What does the colour indicates?
2)
How does one can understand the temperature dependence of resistivity of a conductor?
3)
What is meant by electromotive force?
4)
In a circuit containing internal resistance r. Find the power delivered.
5)
State Joule's law.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the types of magnets? Give example.
2)
Write the Properties of magnet.
3)
Mention the properties of Magnetic field lines?
4)
Tabulate the difference between Coulomb's law and Biot-Savort's law.
5)
State that a current carrying loop behaves as a magnetic dipole. Hence write an expression for its magnetic dipole moment.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two identical charged produces moving with the same speed enter a region of uniform magnetic field. If one of these enters normal to the field direction and the other enters along a direction at 30° with the field. What would be the ratio of their angular frequencies.
2)
A long straight wire AB carries a current I. A proton P travels with a speed v, parallel to the wire, at a distance d from it in a direction opposite to the current as shown in figure what is the force experienced by the proton and what is its direction?
3)
Can a galvanometer be used for measuring the current? Explain.
4)
A given galvanometer is to be converted into
(i) an ammeter
(ii) a voltmeter.
In which case will the required resistance be
(i) least
(ii) highest and why?
5)
State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is Phasort and How to draw phasor diagram.
2)
How does the capacitive reactance depend on frequency? & What is the reactance of a capacitor at hertz to the study at?
3)
What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.
4)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.
5)
What is the phase difference between
(i) the voltage across L and C in an LCR circuit connected to an a.c source
(ii) applied a.c voltage and current in LCR circuit at resonance?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Distinguish between average & rms value of an AC.
2)
What is Phasort and How to draw phasor diagram.
3)
How does the capacitive reactance depend on frequency? & What is the reactance of a capacitor at hertz to the study at?
4)
What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.
5)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The charge on a parallel plate capacitor varies as q = q_o cos 2\(\pi \gamma \)t. The plates are very large and close together. (area - A. separation - d) find the displacement current through the capacitor?
2)
A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.
3)
How does Ampere - Maxwell law expalain the flux of current trough a capacitor when it is being charged by a battery? write the expression for the displacement current in terms of the rate of change of electric flux.
4)
Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10^-4m and write their uses.
5)
Name the parts of Electromagnetic spectrum which is
(i) used to destroy becteria.
(ii) produced by where is a sudden deceleration of high speed electrons.
(iii) used in food industry.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write an expression for the momentum of Electromagnetic wave.
2)
Write the uses of Infrared radiation
3)
Write the frequency source of production and uses of Ultraviolet radiation.
4)
Write the production of gamma rays and mention its properties and uses.
5)
Identify the following Electromagnetic radiations
(a) 10⁹ Hz
(b) 10¹¹ Hz. Give one application of each.

12th Standard English Medium Physics Subject Ray Optics Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the conditions for nature of objects and images.
2)
What is focus (or) focal point of a mirror?
3)
Define refractive index of a medium.
4)
An object is placed at the principal focus of a convex lens. Determine the position of the image making use of the lens equation.
5)
The image of a candle is formed by a convex lens on a screen. The lower half of the lens is painted black to make it completely opaque. Draw the ray diagram to show the image formation. How will this image be different from the one obtained when the lens is not painted black?

12th Standard English Medium Physics Subject Ray Optics Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is principal axis of the mirror?
2)
What is focus (or) focal point of a mirror?
3)
Write the difference between paraxial rays and marginal rays.
4)
What is thin lens?
5)
Use the lens equation to deduce algebraically the following:
"An object placed within the focus of a convex lens produces a virtual and enlarged image".

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
List out the laws of photoelectric effect. (or) Write any three Laws of Photoelectric Effect
2)
When the electron orbiting in a hydrogen atom in its ground state moves to the third excited state, show how the de Broglie wavelength associated with it would be affected?
3)
The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B. Which one of the two has higher value of workfunction? Justify your answer.
4)
Show the variation of photocurrent with collector plate potential for different frequencies but same intensity of incident radiation.
5)
(i) Draw a graph showing variation of photoelectric current (I) with anode potential (V) for different intensities of incident radiation. Name the characteristic of the incident radiation that is kept constant in this experiment.
(ii) If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃having frequencies v₁, v₂ and v₃ respective incident on a photosensitive surface.
The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃ having frequencies v₁,v_2, and v₃ respective incident on a photosensitive surface.
2)
The frequency V of incident radiation is greater than threshold frequency (v_o) in a photocell. How will the stopping potential vary if frequency (v) is increased, keeping other factors constant?
3)
Two metals A and B have work functions 4eV and 10eV respectively. Which metal has the higher threshold wavelength?
4)
de Broglie wavelength associated with an electron accelerated through a potential difference V is \(\lambda\). What will be the de Broglie wavelength when the accelerating potential is increased to 4 V?
5)
Red light however bright it is, cannot produce the emission of electrons from a clean zinc surface, but even weak ultraviolet radiation can do so; why?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What does a neutron moderator do?
2)
What is the diameter of H₂ atom?
3)
Digine atomic mass unit. Find its energy equivalent in MeV
4)
Energy released per fission of a nucleus is of the order of 200 MeV whereas that per fusion, is of the order of 10 MeV. But a fusion bomb (Hydrogen bomb) is said to be more powerful than a fission bomb. Explain why?
5)
What are radioactive elements? What are the factors that affect radio activity?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the properties of neutrino?
2)
Show that the decay rate 'R' of a sample of a radionuclide is related to the number of radioactive nuclei 'N' at the same instant by the expression R = λN.
3)
Digine atomic mass unit. Find its energy equivalent in MeV
4)
If the total number of neutrons and protons in a nuclear reaction is conserved how than is the energy absorbed or evolved in the reaction? Explain.
5)
With respect to power generation, what are the relative advantages and disadvantages of fusion type and Fission type reactors?

12th Standard English Medium Physics Subject Wave Optics Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the conditions for obtaining clear and broad interference bands?
2)
Discuss diffraction at single slit and obtain the condition for n^th maximum.
3)
What are Airy's discs?
4)
Write the drawbacks of Nicol prism.

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the application of nano robots in medical field?
2)
What is particle physics?
3)
Write the two ways of preparing the nano materials.
4)
Write the aim of artificial intelligence in robots.
5)
What is robotics?

12th Standard English Medium Physics Subject Electronics and Communication Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write the limitations of AM.
2)
Write the limitations of FM.
3)
Write the applications of internet.
4)
Explain why TV transmission towers made high.
5)
Why ground wave cannot be used for long distance communication using high frequency?

12th Standard English Medium Physics Subject Electronics and Communication Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the advantages and Limitations of FM?
2)
What are the advantages of FM
3)
What are the application of satellite communication?
4)
Why space wave propagation is limited upto small distance over earth's surface?
5)
What does the term LOS communication mean? Name the types of waves that are used for this communication. What is the range of their frequency?

12th Standard English Medium Physics Subject Electrostatics Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
It requires 50 μJ of work to carry a 2C charge from point R to S. What is the potential difference between these points?
2)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
3)
Three points A, B & C lie in a uniform electric field (E) of 5 x 10³ NC^-1Find the potential difference between A & C.
4)
A copper slab of mass 2g contains 2 x 10²² atoms. The charge on the nucleus of each atom is 29 e. What fraction of the electrons must be removed from the sphere to give it a charge of +2μC?
5)
A metal sphere has a charge of -6μC. When 5 x 10¹² electrons are removed from the sphere. What would be net charge on it?

12th Standard English Medium Physics Subject Electrostatics Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
2)
A capacitor of capacity 10μF is subjected to charge by a battery of 10V. Calculate the energy stored in the capacitor.
3)
A parallel plate capacitor has plate area, 25 cm⁺² and a separation of 2 mm between the plates. The capacitor is connected to a battery of 12V. Find the charge on the capacitor.
4)
In the circuit shown in figure. Find
(i) The equivalent capacitance and
(ii) The charge stored in each capacitor
5)
Two insulated charged copper sphere A and B have their centres separated by a distance of 50cm.
(i) What is the force of electrostatic repulsion, if the charge on each is 6.5 x 10^-7C and the radii of A and B are negligible compared to the distance of separation?
(ii) What is the force of repulsion, if each sphere is charged double the above amount and the distance between them is halved?

12th Standard English Medium Physics Subject Current Electricity Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the effect internal resistance in series and parallel.
2)
Explain the variation of resistivity of conductor and semiconductor with change in temperature.
3)
A conductor of length I is connected to d.c. source of potential V. If the length of the conductor is doubled by treating it, keeping V constant, explain how do the following factors vary in the conductor
(i) Drift velocity.
(ii) Resistor
(iii) Resistivity.
4)
The lengths & radii of three wires of the same metal in the radio 2: 3 : 4 & 3 : 4: 5 respectively. They are joined in parallel & included in a circuit having a 5 A current. Find current in each wire.
5)
In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.

12th Standard English Medium Physics Subject Current Electricity Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.
2)
An aluminium wire of diameter 0.24 cm is connected in series to a copper wire of diameter 0.16 cm. The wires carry an electric current of 10 A. Determine the current density in aluminium wire.
3)
In a wheat stone bridge circuit P = 7, Q = 8 , R = 12 & s = 7. Find the additional resistance to be used in series with S, so that the bridge is balanced.
4)
Using Kirchhoff's laws in the given circuit determine
(i) the voltage drop across the unknown resistor 'R'
(ii) the current 'I' in the ohm EF.
5)
Calculate the value of the resistance 'R' in the circuit shown in the figure so that the current in the circuit is 0.2 A. What would be the potential difference between points A and B?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Drive an expression of Potential energy of a bar magnet in a uniform magnetic field.
2)
Explain magnetic dipole moment of a revolving electron.
3)
Describe the motion of a charged particle in a uniform magnetic field.
4)
Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.
5)
Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.

12th Standard English Medium Physics Subject Book Back 5 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.
2)
Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will get fused?
3)
What is the magnetic field at the centre of the loop shown in figure?
4)
A rectangular coil of area 70 cm² having 600 turns rotates about an axis perpendicular to a magnetic field of 0.4 Wb m^–2.If the coil completes 500 revolutions in a minute, calculate the instantaneous emf when the plane of the coil is
(i) perpendicular to the field
(ii) parallel to the field and
(iii) inclined at 60^o with the field.
5)
A 400 mH coil of negligible resistance is connected to an AC circuit in which an effective current of 6 mA is flowing. Find out the voltage across the coil if the frequency is 1000 Hz.

12th Standard English Medium Physics Subject Book Back 5 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A water molecule has an electric dipole moment of 6.3 x 10^-30 Cm. A sample contains 10²² water molecules, with all the dipole moments aligned parallel to the external electric field of magnitude 3 x 10⁵ NC^-1. How much work is required to rotate all the water molecules from θ = 0° to 90°?
2)
A parallel plate capacitor filled with mica having ε_r = 5 is connected to a 10 V battery. The area of the parallel plate is 6 cm² and separation distance is 6 mm.
(a) Find the capacitance and stored charge.
(b) After the capacitor is fully charged, the battery is disconnected and the dielectric is removed carefully.
Calculate the new values of capacitance, stored energy and charge.
3)
The total number of electrons in the human body is typically in the order of 10²⁸. Suppose, due to some reason, you and your friend lost 1% of this number of electrons. Calculate the electrostatic force between you and your friend separated at a distance of 1m. Compare this with your weight. Assume mass of each person is 60 kg and use point charge approximation.
4)
A point charge of +10 μC is placed at a distance of 20 cm from another identical point charge of +10 μC. A point charge of -2 μC is moved from point a to b as shown in the figure. Calculate the change in potential energy of the system? Interpret your result.
5)
For the given capacitor configuration
(a) Find the charges on each capacitor
(b) potential difference across them
(c) energy stored in each capacitor

12th Standard English Medium Physics Subject Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 x 10^–11 m. The magnitude of charges on the electron and proton are 1.6 x 10^–19 C. Mass of the electron is m_e = 9.1 x 10^–31 kg and mass of proton is m_p = 1.6 x 10^–27 kg.
2)
A block of mass m carrying a positive charge q is placed on an insulated frictionless inclined plane as shown in the figure. A uniform electric field E is applied parallel to the inclined surface such that the block is at rest. Calculate the magnitude of the electric field E.
3)
Discuss the various properties of conductors in electrostatic equilibrium.
4)
Describe the microscopic model of current and obtain general form of Ohm’s law.
5)
The repulsive force between two magnetic poles in air is 9 x 10^–3 N. If the two poles are equal in strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.

12th Standard English Medium Physics Subject Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the number of electrons in one coulomb of negative charge.
2)
Calculate the electric field at points P, Q for the following two cases, as shown in the figure.
(a) A positive point charge +1 μC is placed at the origin.
(b) A negative point charge -2 μC is placed at the origin.
3)
Derive an expression for the torque experienced by a dipole due to a uniform electric field.
4)
Obtain the expression for energy stored in the parallel plate capacitor.
5)
The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Drive an expression of Potential energy of a bar magnet in a uniform magnetic field.
2)
Explain magnetic dipole moment of a revolving electron.
3)
Describe the motion of a charged particle in a uniform magnetic field.
4)
Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.
5)
Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.

12th Standard English Medium Physics Subject Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Write down Coulomb’s law in vector form and mention what each term represents.
2)
Write a short note on superconductors?
3)
Define ampere.
4)
What is meant by mutual induction?
5)
What is principle of reversibility?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Straight in LC oscillations, the sum of energies stored in capacitor & the inductors is constant in time.
2)
Write the analogies between electrical and mechanical quantities
3)
Explain the mutual induction between two long solenoids. Obtain an expression for the mutual inductance.
4)
In an a.c circuit R = 4Ω; z = 5Ω, V_rms = 200V and I_rms = 1.5A calculate the average power consumed over a full cycle.
5)
The instantaneous current and voltage of an a.c circuit are given by i = 10 sin 314t A and V = 50 sin (314t + π/2)V. What is the power dissipation in the circuit?

12th Standard English Medium Physics Subject Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The electric field lines never intersect. Justify.
2)
What is dielectric strength?
3)
Define electrical resistivity.
4)
What is Thomson effect?
5)
State Biot-Savart’s law.

12th Standard English Medium Physics Subject Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Which charge configuration produces a uniform electric field?
2)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
3)
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
4)
A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is ______.
5)
A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the centre of the spiral is ______.

12th Standard English Medium Physics Subject Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
2)
Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?
3)
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
4)
A flat dielectric disc of radius R carries an excess charge on its surface. The surface charge density is σ. The disc rotates about an axis perpendicular to its plane passing through the center with angular velocity ω. Find the magnitude of the torque on the disc if it is placed in a uniform magnetic field whose strength is B which is directed perpendicular to the axis of rotation.
5)
The flux linked with a coil at any instant t is given by \(\Phi\)_B = 10t²− 50t + 250. The induced emf at t = 3s is

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The magnetic flux through a coil perpendicular to the plane is given by Φ = 5t³ +4t² +2t calculate the induced emf through the coil at t = 2S
2)
A circular coil of radius 8.0 cm and 20 turns rotated about its vertical diameter with an angular speed of 50 rads in a uniform horizontal magnetic field of magnitude 3 X 10^-2T. Obtain the maximum and average emf induced in the coil if the coil forms a closed loop of resistance 10Ω then calculate the average power loss due to joule heating.
3)
In the circuit diagram shown in figure, R = 10W, L = 5H, E = 20V. I = 2A. This current is decreasing at a rate of -1.0A/S. Find VAB at this instant.
4)
An AC generator consists of a coil of 1000 turns and cross sectional area of 100 cm2, rotating at an angular speed of 100 rpm in a uniform magnetic field of 1.6 x 10^-2 T calculate the maximum emf produced in the coil.
5)
The instantaneous current from an AC source is given by I = 5 sin 314 t. What is the rms value of the current?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The oscillating magnetic field in a plane Electromagnetic wave is given by
B = (8 x 10^-6) sin (2 x 10¹¹t + 300 πx) T
(i) Calculate the λ of Electromagnetic wave.
(ii) Find the amplitude of electric field.
2)
The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10^-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.
3)
In which way you can establish an instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μf capacitor?
4)
A plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?
5)
Use the formula E = h૪ (for energy of a quantum of radiation photon) and obtain the photon energy in units of ev for different parts of the Electromagnetic spectrum. In what ways are the different scales of photon energies that you obtain related to the sources of Electromagnetic radiation?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Show how to generalize Ampere's circuital law to include the term due to displacement current?
2)
In an Electromagnetic wave propagating along the X - direction, the magnetic field oscillates at a frequency. 5 x 10⁸ Hz and has an amplitude of 10^-7 tesla, acting along the Y-direction.
(i) What is the wavelength of the wave?
(ii) Write the expression representing the corresponding oscillating electric field.
3)
In a plane Electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 1.5 x 10¹⁰Hz with & an amplitude of 36 Vm^-1.
(i) What is the wavelength of a wave?
(ii) What the amplitude of the oscillating magnetic field?
(iii) Straight the average energy density of the electric field \(\left( \overrightarrow { E } \right) \), is equal to average energy density of the magnetic field \(\left( \overrightarrow { B } \right) \)
4)
In an electric circuit, there is a capacitor of reactance 100 Ω connected across the source of 220 V, find the displacement current.
5)
An electromagnetic wave is traveling in vacuum with a speed 3 x 10⁸ m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1 respectively.

12th Standard English Medium Physics Subject Ray Optics Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
(I) Calculate the distance of an object of height h from a concave mirror of radius of curvature 20 cm, so as to obtain a real image of magnification 2. Find the location of image also.
(ii) Using mirror formula, explain why does a convex mirror always produce a virtual image.
2)
An object is placed 40 cm from a convex lens of focal length 30 cm, If a concave lens of focal length 50 cm is introduced between the convex lens and the image formed such that it is 20 cm from the convex lens, find the change in the position of the image.
3)
A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of the ray through the prism. From which face will the ray emerge? Justify your answer.
4)
Draw a plot showing the variation of power of a lens with the wavelength of the incident light.
5)
A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm. Find the power of concave lens.

12th Standard English Medium Physics Subject Ray Optics Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the angle of dispersion between red and violet colours produced by a flint glass prism of refracting angle of 600. Given μ_v= 1.633 and = μ_r 1.622.
2)
Lightly falls from glass (μ = 1.5) to air. Find the angle of incidence for which the angle of deviation is 90^o.
3)
What is the focal length of a convex lens (μ = 1.5) with radii of curvature R.
4)
A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15cm from this lens, find the position of the image formed.
5)
Draw and explain the image formation in spherical mirrors.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The ground state energy of the hydrogen atom is -13.6 eV. If an electron makes a transition from an energy level -1.51 eV to -3.4 eV, calculate the wavelength of the spectral line emitted and name the series of hydrogen spectrum to which it belongs.
2)
Write the application of x-rays.
3)
For photo electronic effect in sodium, the figure shows the plot of cut-off voltage versus frequency of incident radiation. Calculate
(i) threshold frequency
(ii) work function for sodium.
4)
Determine the value of the de Broglie wavelength associated with the electron orbiting in the ground state of hydrogen atom (Given En = -(13.6 n²) eV and Bohr radius r₀ = 0.53 Å). How will the de Broglie wavelength change when it is in the first excited state?
5)
Write briefly the underlying principle used in Davison-Germer experiment to verify wave nature of electrons experimentally. What is the de-Broglie wavelength of an electron with kinetic energy (KE) 120 eV?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which
(a) an electron and
(b) a neutron would have the same Broglie wavelength.
2)
An ∝ - particle and a proton are accelerated from rest through the same potential difference V. Find the ratio of de Broglie wavelength associated with them.
3)
An electron and photon have same energy 100 eV. which has greater associated wavelength?
4)
Plot a graph showing the variation of photoelectric current with the intensity of light. The work function for the following metals is given. Na: 2.75 eV and Mo: 4.175 eV. Which of these will not give photoelectron emission from a radiation of wavelength 3300 Å from a laser bean?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the drawbacks of Rutherford atom model?
2)
Explain Chain reaction.
3)
Two stable isotopes of lithium \(_{ 3 }^{ 6 }{ Li }\) and \(_{ 3 }^{ 7 }{ Li }\) have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. Find the atomic mass of lithium.
4)
In a nuclear reactor, \(_{ }^{ 235 }U{ }\) undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces 1000 MW power. If the reactor is to function for 10 years, find the total mass of uranium required.
5)
The binding energies per nucleon for deuteron \((_{ 1 }^{ 2 }{ H })\) and helium \((_{ 2 }^{ 4 }{ He) }\) are 1.1 MeV and 7 MeV respectively. Determine the energy released when two deuterons fuse to form a helium nucleus \((_{ 2 }^{ 4 }{ He) }\)

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A radioactive sample contains 2.2 mg pure \(_{ 6 }^{ 11 }{ C }\) which has half-life period of 1224 second Calculate.
(i) the number of atoms present initially.
(ii) the activity when 5 μg of the sample will be left.
2)
A nucleus of UX₁ has a half-life of 24.1 days. How long a sample of UX₁ will take to change 90% of it to UX₂?
3)
A certain radioactive element disintegrates for an interval of time equal to mean life. What fraction of element disappears? What fraction of element is left?
4)
A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to 3.125% of its original value?
5)
Determine the distance of closest approach when an alpha particle of kinetic energy 4.5 MeV strikes a nucleus of Z = 80, stops and reverses its direction.

12th Standard English Medium Physics Subject Wave Optics Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The critical angle for a given piece of glass is 45°. Calculate the polarising angle for it. Also calculate the angle of refraction when light is incident on this glass at an angle of incident equal to i_p.
2)
The total magnification produced by a compound microscope is 20. The magnification produced by the eyepiece is 5. The microscope is focused on a certain object. The distance between the objective and eyepiece is observed to be 14 cm. If the least distance of distinct vision is 20 cm, calculate the focal length of the objective and the eyepiece.
3)
In young's double slit experiment, the angular width of a fringe is found to be 0.2^o on a screen placed 1m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water? Take refractive index of water as \(\cfrac { 4 }{ 3 } \).
4)
Light of wavelength 600 nm that falls on a pair of slits producing interference pattern on a screen in which the bright fringes are separated by 7.2 mm. What must be the wavelength of another light which produces bright fringes separated by 8.1 mm with the same apparatus?
5)
An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 cm when the eye is least strained. (a) Whether it is a microscope or a telescope? (b) What is the angular magnification produced?

12th Standard English Medium Physics Subject Wave Optics Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 cm when the eye is least strained. (a) Whether it is a microscope or a telescope? (b) What is the angular magnification produced?
2)
The eyepiece and objective of a microscope having focal lengths of 0.03 m and 0.04 m respectively are separated by a distance 0.2 m. Now the eyepiece and the objective are to be interchanged such that the angular magnification of the instrument remains the same. What is the separation between the lenses?
3)
Two polaroids are set in crossed positions. A third polaroid is placed between the two making an angle e with the pass axis of the first polaroid. Write the expression for the intensity of light transmitted from the second polaroid. In what orientations will the transmitted intensity be
(i) minimum and
(ii) maximum.
4)
Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light? For what angle of incidence is the reflected ray normal to the incident ray?
5)
Prove the laws of reflection using Huygen's principle.

12th Standard English Medium Physics Subject Electronics and Communication Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
How does the change in temperature and application of electric field affect the behavior of materials and write the range of resistivity for each materials.
2)
Explain current transfer characteristics.
3)
For a BJT, the common - base current gain α = 0.98 and the collector base junction reverse bias saturation I_CU = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_D= 20 μA. The collector current I_C for this mode of operating is
4)
What is RADAR? Explain its function. State its applications
5)
What is meant by satellite communication? Give its applications.

12th Standard English Medium Physics Subject Electronics and Communication Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain and classify transistor as an oscillator.
2)
Write any two distinguishing features between Insulators, Metals and semiconductors and insulators an the basis of energy band diagrams.
3)
For a BJT, the common - base current gain α = 0.98 and the collector base junction reverse bias saturation I_CU = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_D= 20 μA. The collector current I_C for this mode of operating is
4)
For a BJT circuit shown, assume that the 'β' of the transistor is very large and V_BE= 0.7 V. The mode of operation.
5)
Write the applications of mobile communication.

12th Standard English Medium Physics Subject Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The value of constant 'K' in coulomb law is _____________.
2)
An electron gun in a TV shoots out a beam of electrons. The beam current is 10\(\mu\)A. The charge that strikes the screen in 1 minute is ______________.
3)
The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.
4)
When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its center will become _____________.
5)
An emf of 12V is induced when the current in the coil changes at the rate of 40 A S^-1. The coefficient of self-induction of the coil is _______________.

12th Standard English Medium Physics Subject Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The intensity of electric field at a point is
2)
The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is ______________.
3)
A current carrying conductor is associated with _______________.
4)
Which of the following cannot be stepped up in a transformer?
5)
The electric and magnetic field of an EM wave are _____________.

12th Standard English Medium Physics Subject Creative 2 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are Polar molecules? Give examples.
2)
What is thermoelectric effect?
3)
Define magnetic flux density.
4)
Draw a graph showing variation of current with changing frequency of applied voltage in a series LCR circuit for two different values of resistance R1 & R2 (I₁ > I₂) fr - resonant frequency.
5)
Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

12th Standard English Medium Physics Subject Creative 2 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Why is terminal voltage of a cell less than its emf?
2)
State the factors on which the current sensitivity of a galvanometer is increased.
3)
The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet what is the cause of this damping?
4)
Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.
5)
How does focal length of a lens change when red light is replaced by blue light?

12th Standard English Medium Physics Subject Creative 3 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is principle used in Microwave oven? Explain.
2)
How does one can understand the temperature dependence of resistivity of a conductor?
3)
What are the types of magnets? Give example.
4)
What is the phase relationship between current & voltage in an inductive? Draw
(i) Phosor diagram and
(ii) wave diagram.
5)
Write the frequency source of production and uses of Ultraviolet radiation.

Stateboard 12th Standard Physics Subject Public Question Paper - March 2022 updated Previous Year Question Papers - by QB Admin - May 13, 2022 - View & Read

12th Standard English Medium Physics Subject Creative 3 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In a circuit containing internal resistance r. Find the power delivered.
2)
State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?
3)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.
4)
Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10^-4m and write their uses.
5)
What is principal axis of the mirror?

Stateboard 12th Standard Physics Subject Public Question Paper - March 2022 updated Previous Year Question Papers - by QB Admin - May 13, 2022 - View & Read

12th Standard English Medium Physics Subject Creative 5 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
2)
Explain the variation of resistivity of conductor and semiconductor with change in temperature.
3)
A potential difference of 3 V is applied across a conductor through which the 5 A of current is flowing. Determine the resistance of the conductor.
4)
Describe the motion of a charged particle in a uniform magnetic field.
5)
Derive an expression for the RMS value of AC.

Stateboard 12th Standard Physics Subject English Medium Public Answer Key - March 2022 updated Previous Year Question Papers - by QB Admin - May 13, 2022 - View & Read

12th Standard English Medium Physics Subject Creative 5 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the potential at a point P due to charge of 5 x 10^-7Clocated 11cm away.
2)
Two metallic wires P₁ & P₂ of the same material & same length but different cross sectional areas A₁ & A₂ are joined together & connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected
(i) in series &
(ii) in parallel.
3)
A cyclotron's frequency is 8 μHz. What should be the operating magnetic field for accelerating protons? If the radius of its dees is 50cm. Calculate the k.E (is μeV) of the proton beam produced by the accelerator.
4)
The magnetic flux through a coil perpendicular to the plane is given by Φ = 5t³ +4t² +2t calculate the induced emf through the coil at t = 2S
5)
A plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?

Stateboard 12th Standard Physics Subject English Medium Public Answer Key - March 2022 updated Previous Year Question Papers - by QB Admin - May 13, 2022 - View & Read

12th Standard English Medium Physics Subject Electrostatics Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The electrostatic force obeys _______.
2)
The value of constant 'K' in coulomb law is _____________.
3)
The relative permittivity of water is _______.
4)
The figure shows tow parallel equipotential surface A and B kept at a small distance 'r' a part from each other. A point change of Q coulomb is taken from the surface A to B. The amount of net work done will be
5)
An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be ______________

12th Standard English Medium Physics Subject Electrostatics Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The electric flux is ________ if the electric field lines enter the closed surface.
2)
Which of the following is a scalar quantity?
3)
When a point charge of 6mC is moved between two points in an electric field, the work done is 1.8 x 10^-5 J. The potential difference between the two points is
4)
When the amber is rubbed with fur, it absorbs bits of papers. This was invented by_______.
5)
The charge of an electron is _________.

12th Standard English Medium Physics Subject Current Electricity Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
If the specific resistance of a potentiometer wire is 10^-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10^-6 m², then potential gradient will be ________________.
2)
In an electrical arrangement as shown the equivalent resistance between X and Y will be
3)
A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?
4)
An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?
5)
How many 160 \(\Omega \) resistor in parallel are required to carry a current of 5 A on a 100 V line?

12th Standard English Medium Physics Subject Current Electricity Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The specific resistance of silicon is__________
2)
The electrical resistivity drops to zero for__________
3)
The phenomenon of superconductivity was first observed by__________
4)
The first theoretical explanation superconductivity was given by_______
5)
Super conductors can be used as storage elements in_________

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The angle of dip at a place, when horizontal and vertical components of earth's field are equal is ______________.
2)
When current is doubled deflection is also doubled in ______________.
3)
A long straight conductor carrying a current lies along the axis of a ring. The conductor will exert a force on the ring if _______________.
4)
The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.
5)
Consider the motion of a charged particle in a uniform magnetic field directed into the paper. If velocity v of the particle is in the plane of the paper, the charged particle will describe a _____________.

12th Standard English Medium Physics Subject Electrostatics Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
2)
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = V_o – V_A, where V_o is the potential at the origin and V_A is the potential at x = 2 m is _____.
3)
Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.
4)
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
5)
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 \(\times\) 10^-2 C and 5 \(\times\) 10^-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The magnitude of the magnetic Lorentz force does not depend on ______
2)
Force on unit length of two parallel wires carrying equal current kept apart by 3m in air is 2 x10^-7 N, then the current in each wire is ______
3)
No current flows between two charged particles when connected if they have same ______
4)
Torque acting on a coil is maximum when the coil is ______
5)
If a current 0.5mA produces a deflection of 156°, then the galvanometer constant is about, ______

12th Standard English Medium Physics Subject Electrostatics Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Which charge configuration produces a uniform electric field?
2)
An electric dipole is placed at an alignment angle of 30^o with an electric field of 2 x 10⁵ NC^-1. It experiences a torque equal to 8 N m. The charge on the dipole if the dipole length is 1 cm is
3)
The total electric flux for the following closed surface which is kept inside water
4)
Rank the electrostatic potential energies for the given system of charges in increasing order
5)
A thin conducting spherical shell of radius R has a charge Q which is uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is _____.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Which of the following cannot be stepped up in a transformer?
2)
If a secondary coil has 40 turns, and a primary coil with 20 turns is charged with 50V of potential difference, then potential difference in secondary would be ________________.
3)
Which current- time graph represents the steady movement of short magnet through a coil XY?
4)
The unit of self inductance is ________________.
5)
The self-inductance Lof a solenoid is given as _________________.

12th Standard English Medium Physics Subject Current Electricity Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The following graph shows current versus voltage values of some unknown conductor. What is the resistance of this conductor?
2)
A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.
3)
What is the value of resistance of the following resistor?
4)
A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is ______.
5)
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW are connected. The voltage of electric mains is 220 V. The maximum capacity of the main fuse of the building will be ______.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The unit of impedance is ________________
2)
For normal frequencies, the range of Q- factor is from _____________.
3)
The power factor of an a.c, circuit is _________
4)
In an LCR series a.c, circuit, the phase difference between current and voltage is 60°. If the net reactance of the circuit is 17.32Ω, the value of the resistance is ______________.
5)
The instantaneous current in an AC circuit containing a pure inductor is i = I_o sinωt, The instantaneous emf is ___________________.

12th Standard English Medium Physics Subject Current Electricity Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?
2)
In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be ______.
3)
There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?
4)
The temperature coefficient of resistance of a wire is 0.00125 per °C. At 20°C, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at ______.
5)
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ______.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The electric and magnetic field of an EM wave are _____________.
2)
Which EM waves are used in medicine to destroy cancer cells?
3)
The existence of E.M. waves was confirmed experimentally by __________________.
4)
A magnetic field is produced by ____________.
5)
Electromagnetic waves are discovered by _______________.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An electron moves in a straight line inside a charged parallel plate capacitor of uniform charge density σ. The time taken by the electron to cross the parallel plate capacitor undeflected when the plates of the capacitor are kept under constant magnetic field of induction \((\vec{B})\) is
2)
A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly ____.
3)
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
4)
A wire of length l carrying a current I along the Y direction is kept in a magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is _____.
5)
A non-conducting charged ring carrying a charge of q, mass m and radius r is rotated about its axis with constant angular speed ω. Find the ratio of its magnetic moment with angular momentum is _____.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
We can make long distance photographs using _________.
2)
_________ emission spectrum is used to identify the gas used.
3)
Carbon are produces ________ spectrum.
4)
A pure green glass plate when, placed in the path of white light, absorbs________.
5)
_________ spectra are used for making dyes

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Two identical coils, each with N turns and radius R are placed coaxially at a distance R as shown in the figure. If I is the current passing through the loops in the same direction, then the magnetic field at a point P at a distance of R/2 from the centre of each coil is _____.
2)
A bar magnet of length l and magnetic moment p_m is bent in the form of an arc as shown in Figure. The new magnetic dipole moment will be
3)
The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is _____.
4)
The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?
5)
A simple pendulum with charged bob is oscillating with time period T and lets θ be the angular displacement. If the uniform magnetic field switched ON in a direction perpendicular to the plane of oscillation then ___________.

12th Standard English Medium Physics Subject Ray Optics Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is _____________.
2)
Two plane mirrors are at right angles to each other. A man stands between them and combs hair with his right hand. In how many of the images will he be seen using his right-hand __________.
3)
A plane mirror produces a magnification of ____________.
4)
What should be the angle between two plane mirror so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other _____________.
5)
It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focused for a distance of ___________.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?
2)
The flux linked with a coil at any instant t is given by \(\Phi\)_B = 10t²− 50t + 250. The induced emf at t = 3s is
3)
The current i flowing in a coil varies with time as shown in the figure. The variation of induced emf with time would be
4)
In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is
5)
In an electrical circuit, R, L, C, and AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and current in the circuit is \(\frac{\pi}{3}\). Instead, if C is removed from the circuit, the phase difference is again \(\frac{\pi}{3}\). The power factor of the circuit is

12th Standard English Medium Physics Subject Ray Optics Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The light reflected by plane mirror may form a real images ____________.
2)
A small object is placed 10 cm in front of a plane mirror. If you stand behind the object 30 cm from the object and look at its image, the distance forced for your eye will be ____________.
3)
A ray of light is incident normally on a lane mirror. The angle of reflection will be _____________.
4)
When a plane mirror is rotated through an angle θ , then the reflected ray turns through the angle 2θ, then the size of the image _____________.
5)
Ray optics is valid, when characteristic dimensions are ______________.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A circular coil with a cross-sectional area of 4 cm² has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm². The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
2)
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
3)
In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between the voltage and current in the circuit is
4)
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series across a source of emf V = 10 sin 340 t. The power loss in AC circuit is
5)
In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
An electron of mass m and charge e is accelerated from rest through a potential difference of V volt in a vacuum. Its final speed will be ______________.
2)
Einstein's work on photoelectric effect gives support to _______________.
3)
Gases begin to conduct electricity at low pressure because ______________.
4)
The value of stopping potential when the frequency of light is equal to the threshold frequency is _________________.
5)
According to special theory of relativity the only constant in all frames is _____________.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
If the amplitude of the magnetic field is 3 x 10⁻⁶ T, then amplitude of the electric field for a electromagnetic waves is _____.
2)
Which of the following is false for electromagnetic waves
3)
The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.
4)
During the propagation of electromagnetic waves in a medium __________________.
5)
A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
If the potential difference is increased by 9 times, the de-Broglie wavelength becomes ________ times the original.
2)
Find the energy released when 5.5 g of matter is used.
3)
The length of a moving scale is 6 m, whose velocity is 2 x 10⁷ m/s. Find its rest length.
4)
The highest magnification order that can be achieved using optical microscope is _________
5)
The number of de Broglie waves of an electron in the nth orbit of an atom is ___________.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In an electromagnetic wave traveling in free space the rms value of the electric field is 3 V m⁻¹. The peak value of the magnetic field is _____.
2)
If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?
3)
Which of the following is an electromagnetic wave?
4)
If E = E_o sin[10⁶ x -ωt] be the electric field of a plane electromagnetic wave, the value of ω is_____.
5)
The electric and magnetic fields of an electromagnetic wave are _____.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 1 Mark Questions with Solution Part - I updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The unit of Rydberg constant is ______________.
2)
A Coolidge tube operates at 18600 V. The maximum frequency of X-radiation emitted from it is ______.
3)
The spectral series of hydrogen atom in UV region is called ____________.
4)
In a discharge tube, the source of positive rays is ________________.
5)
The ionisation potential of hydrogen atom is ______________.

12th Standard English Medium Physics Subject Ray Optics Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The speed of light in an isotropic medium depends on, ______.
2)
An object is placed in front of a convex mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.
3)
If the velocity and wavelength of light in air is V_a and λ_a and that in water is V_w and λ_w, then the refractive index of water is______.
4)
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as plane sheet of glass. This implies that the liquid must have refractive index, ______.
5)
An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is ______.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 1 Mark Questions with Solution Part - II updated Creative Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Oxides of Plutonium and Uranium are used as fuel for ________ reactors.
2)
Graphite is used as a __________ in nuclear reactors.
3)
The moderator used in nuclear reactor is ________________.
4)
In a nuclear reactor, cadmium rods are used to _____________
5)
The explosion of hydrogen bomb is based on the principle of _________________.

12th Standard English Medium Physics Subject Ray Optics Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is, ______.
2)
For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is, ______.
3)
Stars twinkle due to, ______.
4)
The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be, ______.
5)
A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45^o . The ray can undergo total internal reflection for the following n, ______.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would _____.
2)
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is _____.
3)
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ /2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the material is _____.
4)
Two radiations with photon energies 0.9 eV and 3.3 eV respectively are falling on a metallic surface successively. If the work function of the metal is 0.6 eV, then the ratio of maximum speeds of emitted electrons in the two cases will be _____.
5)
If the mean wavelength of light from sun is taken as 550 nm and its mean power as 3.8 x 10²⁶W, then the number of photons emitted per second from the sun is of the order of _____.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be _____.
2)
A light source of wavelength 520 nm emits 1.04 x 10¹⁵photons per second while the second source of 460 nm produces 1.38 x 10¹⁵ photons per second. Then the ratio of power of second source to that of first source is _____.
3)
The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.
4)
Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is _____.
5)
Emission of electrons by the absorption of heat energy is called ______ emission.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus of atomic number Z, then the distance of closest approach of alpha particle to the nucleus is _____.
2)
Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is _____.
3)
The charge of cathode rays particle is _____.
4)
The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li⁺⁺, He⁺and H is _____.
5)
If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate nuclear radius of ⁶⁴Cu, in femi is _____.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In J.J. Thomson e/m experiment, electrons are accelerated through 2.6 kV enter the region of crossed electric field and magnetic field of strength 3.0 x 10⁴ Vm^-1 and 1.0 x 10^-3 T, respectively, and pass through it and undeflected, then the specific charge is _____.
2)
The electric potential of an electron is given by \(V={ V }_{ 0 } \ In\left( \frac { r }{ { r }_{ 0 } } \right) \), where r₀ is a constant. If Bohr atom model is valid, then variation of radius of n^th orbit r_n with the principal quantum number n is _____.
3)
The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as _____.
4)
M_p denotes the mass of the proton and M_n denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by _____.(where c is the speed of light)
5)
The half-life period of a radioactive element A is same as the mean life time of another radioactive element B. Initially both have the same number of atoms. Then _____.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Which one of the following is the natural nanomaterial.
2)
The method of making nanomaterial by assembling the atoms is called _____.
3)
The materials used in Robotics are _____.
4)
The technology used for stopping the brain from processing pain is _____.
5)
The gravitational waves were theoretically proposed by _____.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The particle size of ZnO material is 30 nm. Based on the dimension it is classified as _____.
2)
The blue print for making ultra durable synthetic material is mimicked from _____.
3)
“Sky wax” is an application of nano product in the field of _____.
4)
The alloys used for muscle wires in Robots are _____.
5)
The particle which gives mass to protons and neutrons are _____.

12th Standard English Medium Physics Subject Wave Optics Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is _____.
2)
Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are _____.
3)
First diffraction minimum due to a single slit of width 1.0 x 10^–5 cm is at 30^o. Then wavelength of light used is,_____.
4)
One of the of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,_____.
5)
The transverse nature of light is shown in,

12th Standard English Medium Physics Subject Wave Optics Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to, _____.
2)
When light is incident on a soap film of thickness 5 x 10^–5 cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be, _____.
3)
First diffraction minimum due to a single slit of width 1.0 x 10^–5 cm is at 30^o. Then wavelength of light used is,_____.
4)
A ray of light strikes a glass plate at an angle 60^o. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is, _____.
5)
Light transmitted by Nicol prism is, _____.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 1 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The barrier potential of a silicon diode is approximately, ______.
2)
A forward biased diode is treated as ________________.
3)
The zener diode is primarily used as ______.
4)
The light emitted in an LED is due to ______.
5)
The specific characteristic of a common emitter amplifier is _______________.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 1 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
If the input to the NOT gate is A = 1011, its output is ______.
2)
Which one of the following represents forward bias diode?
3)
The output of the following circuit is 1 when the input ABC is______.
4)
The signal is aff ected by noise in a communication system _____________.
5)
The internationally accepted frequency deviation for the purpose of FM broadcasts ____________.

12th Standard English Medium Physics Subject Electrostatics Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is meant by quantisation of charges?
2)
What are the differences between Coulomb force and gravitational force?
3)
Define ‘electric field’
4)
The electric field lines never intersect. Justify.
5)
Write the general definition of electric dipole moment for a collection of point charge.

12th Standard English Medium Physics Subject Electrostatics Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the properties of an equipotential surface?
2)
Define ‘electrostatic potential energy’.
3)
What is meant by electrostatic energy density?
4)
What is polarisation?
5)
Define ‘capacitance’. Give its unit.

12th Standard English Medium Physics Subject Current Electricity Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Distinguish between drift velocity and mobility.
2)
State macroscopic form of Ohm’s law.
3)
Define electrical resistivity.
4)
Write a short note on superconductors?
5)
Define current density.

12th Standard English Medium Physics Subject Current Electricity Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Why current is a scalar?
2)
State microscopic form of Ohm’s law.
3)
What are ohmic and non ohmic devices?
4)
Define temperature coefficient of resistance.
5)
What is electric power and electric energy?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Define magnetic dipole moment.
2)
What is magnetic susceptibility?
3)
What is magnetic permeability?
4)
Compare dia, para and ferro-magnetism.
5)
Define ampere.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is meant by magnetic induction?
2)
Define magnetic dipole moment.
3)
What is magnetic susceptibility?
4)
What is magnetic permeability?
5)
Compare dia, para and ferro-magnetism.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are step-up and step-down transformers?
2)
How will you define RMS value of an alternating current?
3)
Define electric resonance.
4)
How will you define Q-factor?
5)
Give any one definition of power factor.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is meant by electromagnetic induction?
2)
State Lenz’s law.
3)
How is Eddy current produced? How do they flow in a conductor?
4)
What for an inductor is used? Give some examples.
5)
What is meant by mutual induction?

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is displacement current?
2)
What are electromagnetic waves?
3)
Write down the integral form of modified Ampere’s circuital law.
4)
Explain the concept of intensity of electromagnetic waves.
5)
What is meant by Fraunhofer lines?

12th Standard English Medium Physics Subject Ray Optics Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are resolution and resolving power?
2)
Discuss about simple microscope and obtain the equations for magnification for near point focusing and normal focusing.
3)
Why are dish antennas curved?
4)
It is possible for two lenses to produce zero power?
5)
Why is yellow light preferred to during fog?

12th Standard English Medium Physics Subject Ray Optics Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
How does an endoscope work?
2)
What are the sign conventions followed for lenses?
3)
Obtain the equation for lateral magnification of thin lens.
4)
Derive the equation for effective focal length for lenses in contact.
5)
What is dispersion?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Why do metals have a large number of free electrons?
2)
What is photoelectric effect?
3)
Give the definition of intensity of light according to quantum concept and its unit.
4)
What is a photo cell? Mention the different types of photocells.
5)
Why we do not see the wave properties of a baseball?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
How will you define threshold frequency?
2)
State de Broglie hypothesis.
3)
A proton and an electron have same kinetic energy. Which one has greater de Broglie wavelength. Justify.
4)
Name an experiment that shows the wave nature of the electron. Which phenomenon was observed in this experiment using an electron beam?
5)
A deuteron and an alpha particle are accelerated with the same potential. Which one of the two has i) greater value of de Broglie wavelength associated with it and ii) less kinetic energy? Explain.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Define the ionization energy and ionization potential.
2)
What is distance of closest approach?
3)
Write a general notation of nucleus of element X. What does each term denote?
4)
What is isotone? Give an example.
5)
Define atomic mass unit u.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is isobar? Give an example.
2)
Show that nuclear density is almost constant for nuclei with Z > 10.
3)
What is binding energy of a nucleus? Give its expression.
4)
Give the physical meaning of binding energy per nucleon.
5)
Give the symbolic representation of alpha decay, beta decay and gamma decay.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What is the difference between Nano materials and Bulk materials?
2)
Mention any two advantages and disadvantages of Robotics.
3)
Why steel is preferred in making Robots?
4)
What are black holes?
5)
What are sub atomic particles?

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Distinguish between Nanoscience and Nanotechnology.
2)
What is the difference between Nano materials and Bulk materials?
3)
Give any two examples for “Nano” in nature.
4)
Why steel is preferred in making Robots?
5)
What are sub atomic particles?

12th Standard English Medium Physics Subject Wave Optics Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Mention the differences between interference and diffraction.
2)
What is polarisation?
3)
Discuss polarisation by selective absorption.
4)
What are plane polarised, unpolarized and partially polarised light?
5)
List the uses of polaroids.

12th Standard English Medium Physics Subject Wave Optics Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What are the salient features of corpuscular theory of light?
2)
What is interference of light?
3)
Obtain the relation between phase difference and path difference.
4)
How does wavefront division provide coherent sources?
5)
What is bandwidth of interference pattern?

12th Standard English Medium Physics Subject Electronics and Communication Book Back 2 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Discuss the biasing polarities in an NPN and PNP transistors
2)
What is the phase relationship between the AC input and output voltages in a common emitter amplifier? What is the reason for the phase reversal?
3)
Give circuit symbol, logical operation, truth table, and Boolean expression of
i) AND gate
ii) OR gate
iii) NOT gate
iv) NAND gate
v) NOR gate and
vi) EX-OR gate.
4)
Define bandwidth of transmission system.
5)
What is mobile communication?

12th Standard English Medium Physics Subject Electronics and Communication Book Back 2 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
What do you mean by Internet of Things?
2)
Distinguish between intrinsic and extrinsic semiconductors.
3)
How electron-hole pairs are created in a semiconductor material?
4)
What do you mean by leakage current in a diode?
5)
Distinguish between avalanche breakdown and Zener breakdown.

12th Standard English Medium Physics Subject Electrostatics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Obtain an expression for potential energy due to a collection of three point charges which are separated by finite distances.
2)
Obtain Gauss law from Coulomb’s law.
3)
Obtain the expression for electric field due to an charged infinite plane sheet.
4)
Discuss the various properties of conductors in electrostatic equilibrium.
5)
Explain dielectrics in detail and how an electric field is induced inside a dielectric.

12th Standard English Medium Physics Subject Electrostatics Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Calculate the number of electrons in one coulomb of negative charge.
2)
Consider two point charges q₁ and q₂ at rest as shown in the figure.

They are separated by a distance of 1m. Calculate the force experienced by the two charges for the following cases:
(a) q₁ = +2μC and q₂ = +3μC
(b) q₁ = +2μC and q₂ = -3μC
(c) q₁= +2μC and q₂ = -3μC kept in water (ε_r = 80)
3)
Two small-sized identical equally charged spheres, each having mass 1 g are hanging in equilibrium as shown in the figure. The length of each string is 10 cm and the angle θ is 30° with the vertical. Calculate the magnitude of the charge in each sphere. (Take g = 10 ms⁻²)
4)
Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 x 10^–11 m. The magnitude of charges on the electron and proton are 1.6 x 10^–19 C. Mass of the electron is m_e = 9.1 x 10^–31 kg and mass of proton is m_p = 1.6 x 10^–27 kg.
5)
Consider four equal charges q₁, q₂, q₃ and q₄ = q = +1 μC located at four different points on a circle of radius 1m, as shown in the figure. Calculate the total force acting on the charge q₁ due to all the other charges.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Deduce the relation for the magnetic field at a point due to an infinitely long straight conductor carrying current using Biot-Savart law.
2)
Compute the torque experienced by a magnetic needle in a uniform magnetic field.
3)
Obtain the magnetic field at a point on the equatorial line of a bar magnet.
4)
Discuss the working of cyclotron in detail.
5)
Explain the principle and working of a moving coil galvanometer.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Let the magnetic moment of a bar magnet be \(\overset { \rightarrow }{ { p }_{ m } } \) whose magnetic length is d = 2l and pole strength is q_m. Compute the magnetic moment of the bar magnet when it is cut into two pieces
(a) along its length
(b) perpendicular to its length.
2)
Calculate the magnetic flux coming out from closed surface containing magnetic dipole (say, a bar magnet) as shown in figure.
3)
A short bar magnet has a magnetic moment of 0.5 J T^–1. Calculate magnitude and direction of the magnetic field produced by the bar magnet which is kept at a distance of 0.1 m from the centre of the bar magnet along
(a) axial line of the bar magnet and
(b) normal bisector of the bar magnet.
4)
Consider a magnetic dipole which on switching ON external magnetic field orient only in two possible ways i.e., one along the direction of the magnetic field (parallel to the field) and another anti-parallel to magnetic field. Compute the energy for the possible orientation.
5)
Compute the intensity of magnetisation of the bar magnet whose mass, magnetic moment and density are 200 g, 2 A m² and 8 g cm^–3, respectively.

12th Standard English Medium Physics Subject Current Electricity Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?
2)
The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?
3)
Consider a rectangular block of metal of height A, width B and length C as shown in the figure.

If a potential difference of V is applied between the two faces A and B of the block (figure (a)), the current I_AB is observed. Find the current that flows if the same potential difference V is applied between the two faces B and C of the block (figure (b)). Give your answers in terms of I_AB.
4)
Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across each resistors in the circuit.
5)
Calculate the equivalent resistance in the following circuit and also find the values of current I, I₁ and I₂ in the given circuit.

12th Standard English Medium Physics Subject Current Electricity Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Resistance of a material at 20^oC and 40^oC are 45 Ω and 85 Ω respectively. Find its temperature coefficient of resistivity.
2)
Describe the microscopic model of current and obtain general form of Ohm’s law.
3)
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
4)
Explain the equivalent resistance of a series and parallel resistor network.
5)
Explain the determination of the internal resistance of a cell using voltmeter.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A circular antenna of area 3 m² is installed at a place in Madurai. The plane of the area of antenna is inclined at 47^o with the direction of Earth’s magnetic field. If the magnitude of Earth’s field at that place is 4.1 x 10^–5 T find the magnetic flux linked with the antenna.
2)
A cylindrical bar magnet is kept along the axis of a circular solenoid. If the magnet is rotated about its axis, find out whether an electric current is induced in the coil.
3)
A straight conducting wire is dropped horizontally from a certain height with its length along east-west direction. Will an emf be induced in it? Justify your answer.
4)
The magnetic flux passes perpendicular to the plane of the circuit and is directed into the paper. If the magnetic flux varies with respect to time as per the following relation \(\Phi_B\) = (2t³+ 3t²+ 8t + 5)mWb, what is the magnitude of the induced emf in the loop when t = 3 s? Find out the direction of current through the circuit.
5)
A copper rod of length l rotates about one of its ends with an angular velocity ω in a magnetic field B as shown in the figure. The plane of rotation is perpendicular to the field. Find the emf induced between the two ends of the rod.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Mention the various energy losses in a transformer.
2)
Find out the phase relationship between voltage and current in a pure inductive circuit.
3)
Define inductive and capacitive reactance. Give their units.
4)
Prove that the total energy is conserved during LC oscillations.
5)
Compare the electromagnetic oscillations of LC circuit with the mechanical oscillations of blockspring system qualitatively to find the expression for angular frequency of LC oscillator.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.
2)
Write short notes on
(a) microwaves
(b) X - rays
(c) Radio waves
(d) Visible spectrum
3)
Explain the Maxwell’s modification of Ampere’s circuital law.
4)
Discuss the source of electromagnetic waves.
5)
Explain the types of absorption spectrum.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Consider a parallel plate capacitor which is connected to an 230 V RMS value and 50 Hz frequency. If the separation distance between the plates of the capacitor and area of the plates are 1 mm and 20 cm² respectively. Calculate the displacement current at t = 1 s.
2)
Write down Maxwell equations in integral form.
3)
Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic spectrum.
4)
Write down the properties of electromagnetic waves.
5)
Explain the types of emission spectrum.

12th Standard English Medium Physics Subject Ray Optics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A coin is at the bottom of a trough containing three immiscible liquids of refractive indices 1.3, 1.4 and 1.5 poured one above the other of heights 30 cm, 16 cm, and 20 cm respectively. What is the apparent depth at which the coin appears to be when seen from air medium outside? In which medium the coin will appear?
2)
What is the radius of the illumination when seen above from inside a swimming pool from a depth of 10 m on a sunny day? What is the total angle of view? [Given, refractive index of water is 4/3]
3)
A optical fibre is made up of a core material with refractive index 1.68 and a cladding material of refractive index 1.44. What is the acceptance angle of the fibre if it is kept in air medium without any cladding?
4)
The thickness of a glass slab is 0.25 m. It has a refractive index of 1.5. A ray of light is incident on the surface of the slab at an angle of 60^o. Find the lateral displacement of the light when it emerges from the other side of the glass slab.
5)
Find the position of the image of a point object O in the two cases given. Take the radius of curvature of the surface R as 15 cm, n₁ = 1 and n₂ = 2.
Case i) O is located 10 cm to the left of the surface.
Case ii) O is located 30 cm to the left of the surface.

12th Standard English Medium Physics Subject Ray Optics Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
A monochromatic light is incident on an equilateral prism at an angle 30^o and is emergent at an angle of 75^o . What is the angle of deviation produced by the prism?
2)
Light ray falls at normal incidence on the first face and emerges gracing the second face for an equilateral prism.
(a) What is the angle of deviation produced?
(b) What is the refractive index of the material of the prism?
3)
The angle of minimum deviation for an equilateral prism is 37^o . Find the refractive index of the material of the prism.
4)
Find the dispersive power of a prism if the refractive indices of flint glass for red, green and violet colours are 1.613, 1.620 and 1.632 respectively.
5)
The wavelength of light from sodium source in vacuum is 5893Å. What are its
(a) wavelength,
(b) speed and
(c) frequency when this light travels in water which has a refractive index of 1.33.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain why photoelectric effect cannot be explained on the basis of wave nature of light.
2)
Obtain Einstein’s photoelectric equation with necessary explanation.
3)
Give the construction and working of photo emissive cell.
4)
Briefly explain the principle and working of electron microscope.
5)
For the photoelectric emission from cesium, show that wave theory predicts that
i) maximum kinetic energy of the photoelectrons (K_max) depends on the intensity I of the incident light.
ii) K_max does not depend on the frequency of the incident light and
iii) the time interval between the incidence of light and the ejection of photoelectrons is very long.
For the sake of simplicity, the following standard assumptions can be made when light is incident on the given material.
a) Light is absorbed in the top atomic layer of the metal
b) For a given element, each atom absorbs an equal amount of energy and this energy is proportional to its cross-sectional area A.
c) Each atom gives this energy to one of the electrons.
(Given: The work function for cesium is 2.14 eV and the power absorbed per unit area is 1.60 x 10^-6 Wm^-2 which produces a measurable photocurrent in cesium.)

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain experimentally observed facts of photoelectric effect with the help of Einstein’s explanation.
2)
Derive an expression for de Broglie wavelength of electrons.
3)
Describe briefly Davisson – Germer experiment which demonstrated the wave nature of electrons.
4)
A radiation of wavelength 300 nm is incident on a silver surface. Will photoelectrons be observed? [work function of silver = 4.7 eV]
5)
The work function of potassium is 2.30 eV. UV light of wavelength 3000 Å and intensity 2 Wm^–2 is incident on the potassium surface.
i) Determine the maximum kinetic energy of the photo electrons
ii) If 40% of incident photons produce photo electrons, how many electrons are emitted per second if the area of the potassium surface is 2 cm²?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Discuss the Millikan’s oil drop experiment to determine the charge of an electron.
2)
Discuss the spectral series of hydrogen atom.
3)
Explain in detail the nuclear force.
4)
Discuss the beta decay process with examples.
5)
Obtain the law of radioactivity.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Briefly explain the elementary particles present in nature.
2)
Find the (i) angular momentum (ii) velocity of the electron revolving in the 5^th orbit of hydrogen atom.
(h = 6.6 x 10^–34 Js, m = 9.1 x 10^–31 kg)
3)
The Bohr atom model is derived with the assumption that the nucleus of the atom is stationary and only electrons revolve around the nucleus. Suppose the nucleus is also in motion, then calculate the energy of this new system.
4)
Calculate the average atomic mass of chlorine if no distinction is made between its different isotopes?
5)
Calculate the density of the nucleus with mass number A.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Discuss the applications of Nanomaterials in various fields.
2)
What are the possible harmful effects of usage of Nanoparticles? Why?
3)
Discuss the functions of key components in Robots?
4)
Elaborate any two types of Robots with relevant examples.
5)
Comment on the recent advancement in medical diagnosis and therapy.

12th Standard English Medium Physics Subject Wave Optics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Discuss the experiment to determine the wavelength of monochromatic light using diffraction grating.
2)
Obtain the equation for resolving power of optical instruments.
3)
Explain about compound microscope and obtain the equation for the magnification.
4)
Explain the experimental determination of refractive index of the material of the prism using spectrometer.
5)
Mention different parts of spectrometer and explain the preliminary adjustments.

12th Standard English Medium Physics Subject Wave Optics Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Prove law of reflection using Huygens’ principle.
2)
Obtain the equation for resultant intensity due to interference of light.
3)
Discuss the interference in thin films and obtain the equations for constructive and destructive interference for transmitted and reflected light.
4)
Discuss the diffraction at a grating and obtain the condition for the m^th maximum.
5)
Discuss the experiment to determine the wavelength of different colours using diffraction grating.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 3 Mark Questions with Solution Part - I updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain the formation of depletion region and barrier potential in PN junction diode.
2)
Draw the circuit diagram of a half-wave rectifier and explain its working.
3)
Explain the construction and working of a full wave rectifier
4)
What is an LED? Give the principle of its operation with a diagram.
5)
Write a note on photodiode.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 3 Mark Questions with Solution Part - II updated Book back Questions - by Question Bank Software - May 13, 2022 - View & Read

1)
Explain the ampitude modulation with necessary diagrams.
2)
Explain the ground wave propagation and space wave propagation of electromagnetic waves through space.
3)
Give the applications of lCT in mining and agriculture sectors.
4)
Fiber optic communication is gaining popularity among the various transmission media -justify.
5)
Explain the formation of depletion region and barrier potential in PN junction diode.

12th Standard English Medium Physics Subject Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Calculate the potential at a point P due to charge of 5 x 10^-7Clocated 11cm away.
2)
Two metallic wires P₁ & P₂ of the same material & same length but different cross sectional areas A₁ & A₂ are joined together & connected to a source of emf. Find the ratio of the drift velocities of free electrons in the two wires when they are connected
(i) in series &
(ii) in parallel.
3)
A cyclotron's frequency is 8 μHz. What should be the operating magnetic field for accelerating protons? If the radius of its dees is 50cm. Calculate the k.E (is μeV) of the proton beam produced by the accelerator.
4)
The magnetic flux through a coil perpendicular to the plane is given by Φ = 5t³ +4t² +2t calculate the induced emf through the coil at t = 2S
5)
A plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?

12th Standard English Medium Physics Subject Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
2)
Explain the variation of resistivity of conductor and semiconductor with change in temperature.
3)
A potential difference of 3 V is applied across a conductor through which the 5 A of current is flowing. Determine the resistance of the conductor.
4)
Describe the motion of a charged particle in a uniform magnetic field.
5)
Derive an expression for the RMS value of AC.

12th Standard English Medium Physics Subject Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
In a circuit containing internal resistance r. Find the power delivered.
2)
State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?
3)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.
4)
Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10^-4m and write their uses.
5)
What is principal axis of the mirror?

12th Standard English Medium Physics Subject Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is principle used in Microwave oven? Explain.
2)
How does one can understand the temperature dependence of resistivity of a conductor?
3)
What are the types of magnets? Give example.
4)
What is the phase relationship between current & voltage in an inductive? Draw
(i) Phosor diagram and
(ii) wave diagram.
5)
Write the frequency source of production and uses of Ultraviolet radiation.

12th Standard English Medium Physics Subject Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Why is terminal voltage of a cell less than its emf?
2)
State the factors on which the current sensitivity of a galvanometer is increased.
3)
The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet what is the cause of this damping?
4)
Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.
5)
How does focal length of a lens change when red light is replaced by blue light?

12th Standard English Medium Physics Subject Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are Polar molecules? Give examples.
2)
What is thermoelectric effect?
3)
Define magnetic flux density.
4)
Draw a graph showing variation of current with changing frequency of applied voltage in a series LCR circuit for two different values of resistance R1 & R2 (I₁ > I₂) fr - resonant frequency.
5)
Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?

12th Standard English Medium Physics Subject Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The intensity of electric field at a point is
2)
The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is ______________.
3)
A current carrying conductor is associated with _______________.
4)
Which of the following cannot be stepped up in a transformer?
5)
The electric and magnetic field of an EM wave are _____________.

12th Standard English Medium Physics Subject Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The value of constant 'K' in coulomb law is _____________.
2)
An electron gun in a TV shoots out a beam of electrons. The beam current is 10\(\mu\)A. The charge that strikes the screen in 1 minute is ______________.
3)
The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.
4)
When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its center will become _____________.
5)
An emf of 12V is induced when the current in the coil changes at the rate of 40 A S^-1. The coefficient of self-induction of the coil is _______________.

12th Standard English Medium Physics Subject Electronics and Communication Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Explain and classify transistor as an oscillator.
2)
Write any two distinguishing features between Insulators, Metals and semiconductors and insulators an the basis of energy band diagrams.
3)
For a BJT, the common - base current gain α = 0.98 and the collector base junction reverse bias saturation I_CU = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_D= 20 μA. The collector current I_C for this mode of operating is
4)
For a BJT circuit shown, assume that the 'β' of the transistor is very large and V_BE= 0.7 V. The mode of operation.
5)
Write the applications of mobile communication.

12th Standard English Medium Physics Subject Electronics and Communication Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
How does the change in temperature and application of electric field affect the behavior of materials and write the range of resistivity for each materials.
2)
Explain current transfer characteristics.
3)
For a BJT, the common - base current gain α = 0.98 and the collector base junction reverse bias saturation I_CU = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_D= 20 μA. The collector current I_C for this mode of operating is
4)
What is RADAR? Explain its function. State its applications
5)
What is meant by satellite communication? Give its applications.

12th Standard English Medium Physics Subject Wave Optics Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 cm when the eye is least strained. (a) Whether it is a microscope or a telescope? (b) What is the angular magnification produced?
2)
The eyepiece and objective of a microscope having focal lengths of 0.03 m and 0.04 m respectively are separated by a distance 0.2 m. Now the eyepiece and the objective are to be interchanged such that the angular magnification of the instrument remains the same. What is the separation between the lenses?
3)
Two polaroids are set in crossed positions. A third polaroid is placed between the two making an angle e with the pass axis of the first polaroid. Write the expression for the intensity of light transmitted from the second polaroid. In what orientations will the transmitted intensity be
(i) minimum and
(ii) maximum.
4)
Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light? For what angle of incidence is the reflected ray normal to the incident ray?
5)
Prove the laws of reflection using Huygen's principle.

12th Standard English Medium Physics Subject Wave Optics Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The critical angle for a given piece of glass is 45°. Calculate the polarising angle for it. Also calculate the angle of refraction when light is incident on this glass at an angle of incident equal to i_p.
2)
The total magnification produced by a compound microscope is 20. The magnification produced by the eyepiece is 5. The microscope is focused on a certain object. The distance between the objective and eyepiece is observed to be 14 cm. If the least distance of distinct vision is 20 cm, calculate the focal length of the objective and the eyepiece.
3)
In young's double slit experiment, the angular width of a fringe is found to be 0.2^o on a screen placed 1m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water? Take refractive index of water as \(\cfrac { 4 }{ 3 } \).
4)
Light of wavelength 600 nm that falls on a pair of slits producing interference pattern on a screen in which the bright fringes are separated by 7.2 mm. What must be the wavelength of another light which produces bright fringes separated by 8.1 mm with the same apparatus?
5)
An optical instrument used for angular magnification has a 25 D objective and a 20D eyepiece. The tube length is 25 cm when the eye is least strained. (a) Whether it is a microscope or a telescope? (b) What is the angular magnification produced?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
A radioactive sample contains 2.2 mg pure \(_{ 6 }^{ 11 }{ C }\) which has half-life period of 1224 second Calculate.
(i) the number of atoms present initially.
(ii) the activity when 5 μg of the sample will be left.
2)
A nucleus of UX₁ has a half-life of 24.1 days. How long a sample of UX₁ will take to change 90% of it to UX₂?
3)
A certain radioactive element disintegrates for an interval of time equal to mean life. What fraction of element disappears? What fraction of element is left?
4)
A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to 3.125% of its original value?
5)
Determine the distance of closest approach when an alpha particle of kinetic energy 4.5 MeV strikes a nucleus of Z = 80, stops and reverses its direction.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are the drawbacks of Rutherford atom model?
2)
Explain Chain reaction.
3)
Two stable isotopes of lithium \(_{ 3 }^{ 6 }{ Li }\) and \(_{ 3 }^{ 7 }{ Li }\) have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. Find the atomic mass of lithium.
4)
In a nuclear reactor, \(_{ }^{ 235 }U{ }\) undergoes fission liberating 200 MeV of energy. The reactor has a 10% efficiency and produces 1000 MW power. If the reactor is to function for 10 years, find the total mass of uranium required.
5)
The binding energies per nucleon for deuteron \((_{ 1 }^{ 2 }{ H })\) and helium \((_{ 2 }^{ 4 }{ He) }\) are 1.1 MeV and 7 MeV respectively. Determine the energy released when two deuterons fuse to form a helium nucleus \((_{ 2 }^{ 4 }{ He) }\)

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which
(a) an electron and
(b) a neutron would have the same Broglie wavelength.
2)
An ∝ - particle and a proton are accelerated from rest through the same potential difference V. Find the ratio of de Broglie wavelength associated with them.
3)
An electron and photon have same energy 100 eV. which has greater associated wavelength?
4)
Plot a graph showing the variation of photoelectric current with the intensity of light. The work function for the following metals is given. Na: 2.75 eV and Mo: 4.175 eV. Which of these will not give photoelectron emission from a radiation of wavelength 3300 Å from a laser bean?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The ground state energy of the hydrogen atom is -13.6 eV. If an electron makes a transition from an energy level -1.51 eV to -3.4 eV, calculate the wavelength of the spectral line emitted and name the series of hydrogen spectrum to which it belongs.
2)
Write the application of x-rays.
3)
For photo electronic effect in sodium, the figure shows the plot of cut-off voltage versus frequency of incident radiation. Calculate
(i) threshold frequency
(ii) work function for sodium.
4)
Determine the value of the de Broglie wavelength associated with the electron orbiting in the ground state of hydrogen atom (Given En = -(13.6 n²) eV and Bohr radius r₀ = 0.53 Å). How will the de Broglie wavelength change when it is in the first excited state?
5)
Write briefly the underlying principle used in Davison-Germer experiment to verify wave nature of electrons experimentally. What is the de-Broglie wavelength of an electron with kinetic energy (KE) 120 eV?

12th Standard English Medium Physics Subject Ray Optics Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Calculate the angle of dispersion between red and violet colours produced by a flint glass prism of refracting angle of 600. Given μ_v= 1.633 and = μ_r 1.622.
2)
Lightly falls from glass (μ = 1.5) to air. Find the angle of incidence for which the angle of deviation is 90^o.
3)
What is the focal length of a convex lens (μ = 1.5) with radii of curvature R.
4)
A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15cm from this lens, find the position of the image formed.
5)
Draw and explain the image formation in spherical mirrors.

12th Standard English Medium Physics Subject Ray Optics Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
(I) Calculate the distance of an object of height h from a concave mirror of radius of curvature 20 cm, so as to obtain a real image of magnification 2. Find the location of image also.
(ii) Using mirror formula, explain why does a convex mirror always produce a virtual image.
2)
An object is placed 40 cm from a convex lens of focal length 30 cm, If a concave lens of focal length 50 cm is introduced between the convex lens and the image formed such that it is 20 cm from the convex lens, find the change in the position of the image.
3)
A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of the ray through the prism. From which face will the ray emerge? Justify your answer.
4)
Draw a plot showing the variation of power of a lens with the wavelength of the incident light.
5)
A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm. Find the power of concave lens.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Show how to generalize Ampere's circuital law to include the term due to displacement current?
2)
In an Electromagnetic wave propagating along the X - direction, the magnetic field oscillates at a frequency. 5 x 10⁸ Hz and has an amplitude of 10^-7 tesla, acting along the Y-direction.
(i) What is the wavelength of the wave?
(ii) Write the expression representing the corresponding oscillating electric field.
3)
In a plane Electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 1.5 x 10¹⁰Hz with & an amplitude of 36 Vm^-1.
(i) What is the wavelength of a wave?
(ii) What the amplitude of the oscillating magnetic field?
(iii) Straight the average energy density of the electric field \(\left( \overrightarrow { E } \right) \), is equal to average energy density of the magnetic field \(\left( \overrightarrow { B } \right) \)
4)
In an electric circuit, there is a capacitor of reactance 100 Ω connected across the source of 220 V, find the displacement current.
5)
An electromagnetic wave is traveling in vacuum with a speed 3 x 10⁸ m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1 respectively.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The oscillating magnetic field in a plane Electromagnetic wave is given by
B = (8 x 10^-6) sin (2 x 10¹¹t + 300 πx) T
(i) Calculate the λ of Electromagnetic wave.
(ii) Find the amplitude of electric field.
2)
The magnetic field amplitude of an Electromagnetic wave is 1.6 x 10^-7 T. If the frequency is 30 MHz. determine electric field, any velocity K and λ.
3)
In which way you can establish an instantaneous displacement current of 1.0 A in the space between the parallel plates of 1μf capacitor?
4)
A plane Electromagnetic wave travels in vacuum along z - direction. What can you say about the directions of electric and magnetic field vectors? If the frequency of the wave is 30 MHz. What is its wavelength?
5)
Use the formula E = h૪ (for energy of a quantum of radiation photon) and obtain the photon energy in units of ev for different parts of the Electromagnetic spectrum. In what ways are the different scales of photon energies that you obtain related to the sources of Electromagnetic radiation?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The magnetic flux through a coil perpendicular to the plane is given by Φ = 5t³ +4t² +2t calculate the induced emf through the coil at t = 2S
2)
A circular coil of radius 8.0 cm and 20 turns rotated about its vertical diameter with an angular speed of 50 rads in a uniform horizontal magnetic field of magnitude 3 X 10^-2T. Obtain the maximum and average emf induced in the coil if the coil forms a closed loop of resistance 10Ω then calculate the average power loss due to joule heating.
3)
In the circuit diagram shown in figure, R = 10W, L = 5H, E = 20V. I = 2A. This current is decreasing at a rate of -1.0A/S. Find VAB at this instant.
4)
An AC generator consists of a coil of 1000 turns and cross sectional area of 100 cm2, rotating at an angular speed of 100 rpm in a uniform magnetic field of 1.6 x 10^-2 T calculate the maximum emf produced in the coil.
5)
The instantaneous current from an AC source is given by I = 5 sin 314 t. What is the rms value of the current?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Straight in LC oscillations, the sum of energies stored in capacitor & the inductors is constant in time.
2)
Write the analogies between electrical and mechanical quantities
3)
Explain the mutual induction between two long solenoids. Obtain an expression for the mutual inductance.
4)
In an a.c circuit R = 4Ω; z = 5Ω, V_rms = 200V and I_rms = 1.5A calculate the average power consumed over a full cycle.
5)
The instantaneous current and voltage of an a.c circuit are given by i = 10 sin 314t A and V = 50 sin (314t + π/2)V. What is the power dissipation in the circuit?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Drive an expression of Potential energy of a bar magnet in a uniform magnetic field.
2)
Explain magnetic dipole moment of a revolving electron.
3)
Describe the motion of a charged particle in a uniform magnetic field.
4)
Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.
5)
Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Drive an expression of Potential energy of a bar magnet in a uniform magnetic field.
2)
Explain magnetic dipole moment of a revolving electron.
3)
Describe the motion of a charged particle in a uniform magnetic field.
4)
Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.
5)
Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.

12th Standard English Medium Physics Subject Current Electricity Creative 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.
2)
An aluminium wire of diameter 0.24 cm is connected in series to a copper wire of diameter 0.16 cm. The wires carry an electric current of 10 A. Determine the current density in aluminium wire.
3)
In a wheat stone bridge circuit P = 7, Q = 8 , R = 12 & s = 7. Find the additional resistance to be used in series with S, so that the bridge is balanced.
4)
Using Kirchhoff's laws in the given circuit determine
(i) the voltage drop across the unknown resistor 'R'
(ii) the current 'I' in the ohm EF.
5)
Calculate the value of the resistance 'R' in the circuit shown in the figure so that the current in the circuit is 0.2 A. What would be the potential difference between points A and B?

12th Standard English Medium Physics Subject Current Electricity Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Calculate the effect internal resistance in series and parallel.
2)
Explain the variation of resistivity of conductor and semiconductor with change in temperature.
3)
A conductor of length I is connected to d.c. source of potential V. If the length of the conductor is doubled by treating it, keeping V constant, explain how do the following factors vary in the conductor
(i) Drift velocity.
(ii) Resistor
(iii) Resistivity.
4)
The lengths & radii of three wires of the same metal in the radio 2: 3 : 4 & 3 : 4: 5 respectively. They are joined in parallel & included in a circuit having a 5 A current. Find current in each wire.
5)
In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.

12th Standard English Medium Physics Subject Electrostatics Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
2)
A capacitor of capacity 10μF is subjected to charge by a battery of 10V. Calculate the energy stored in the capacitor.
3)
A parallel plate capacitor has plate area, 25 cm⁺² and a separation of 2 mm between the plates. The capacitor is connected to a battery of 12V. Find the charge on the capacitor.
4)
In the circuit shown in figure. Find
(i) The equivalent capacitance and
(ii) The charge stored in each capacitor
5)
Two insulated charged copper sphere A and B have their centres separated by a distance of 50cm.
(i) What is the force of electrostatic repulsion, if the charge on each is 6.5 x 10^-7C and the radii of A and B are negligible compared to the distance of separation?
(ii) What is the force of repulsion, if each sphere is charged double the above amount and the distance between them is halved?

12th Standard English Medium Physics Subject Electrostatics Creative 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
It requires 50 μJ of work to carry a 2C charge from point R to S. What is the potential difference between these points?
2)
An electron is released from the bottom plate (E = 10⁴ Nc^-1) Find the velocity of the electron when it reaches plate B. (e/m = 1.76 x 10¹¹ Ckg^-1).
3)
Three points A, B & C lie in a uniform electric field (E) of 5 x 10³ NC^-1Find the potential difference between A & C.
4)
A copper slab of mass 2g contains 2 x 10²² atoms. The charge on the nucleus of each atom is 29 e. What fraction of the electrons must be removed from the sphere to give it a charge of +2μC?
5)
A metal sphere has a charge of -6μC. When 5 x 10¹² electrons are removed from the sphere. What would be net charge on it?

12th Standard English Medium Physics Subject Electronics and Communication Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are the advantages and Limitations of FM?
2)
What are the advantages of FM
3)
What are the application of satellite communication?
4)
Why space wave propagation is limited upto small distance over earth's surface?
5)
What does the term LOS communication mean? Name the types of waves that are used for this communication. What is the range of their frequency?

12th Standard English Medium Physics Subject Electronics and Communication Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the limitations of AM.
2)
Write the limitations of FM.
3)
Write the applications of internet.
4)
Explain why TV transmission towers made high.
5)
Why ground wave cannot be used for long distance communication using high frequency?

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the application of nano robots in medical field?
2)
What is particle physics?
3)
Write the two ways of preparing the nano materials.
4)
Write the aim of artificial intelligence in robots.
5)
What is robotics?

12th Standard English Medium Physics Subject Wave Optics Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are the conditions for obtaining clear and broad interference bands?
2)
Discuss diffraction at single slit and obtain the condition for n^th maximum.
3)
What are Airy's discs?
4)
Write the drawbacks of Nicol prism.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the properties of neutrino?
2)
Show that the decay rate 'R' of a sample of a radionuclide is related to the number of radioactive nuclei 'N' at the same instant by the expression R = λN.
3)
Digine atomic mass unit. Find its energy equivalent in MeV
4)
If the total number of neutrons and protons in a nuclear reaction is conserved how than is the energy absorbed or evolved in the reaction? Explain.
5)
With respect to power generation, what are the relative advantages and disadvantages of fusion type and Fission type reactors?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What does a neutron moderator do?
2)
What is the diameter of H₂ atom?
3)
Digine atomic mass unit. Find its energy equivalent in MeV
4)
Energy released per fission of a nucleus is of the order of 200 MeV whereas that per fusion, is of the order of 10 MeV. But a fusion bomb (Hydrogen bomb) is said to be more powerful than a fission bomb. Explain why?
5)
What are radioactive elements? What are the factors that affect radio activity?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃having frequencies v₁, v₂ and v₃ respective incident on a photosensitive surface.
The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃ having frequencies v₁,v_2, and v₃ respective incident on a photosensitive surface.
2)
The frequency V of incident radiation is greater than threshold frequency (v_o) in a photocell. How will the stopping potential vary if frequency (v) is increased, keeping other factors constant?
3)
Two metals A and B have work functions 4eV and 10eV respectively. Which metal has the higher threshold wavelength?
4)
de Broglie wavelength associated with an electron accelerated through a potential difference V is \(\lambda\). What will be the de Broglie wavelength when the accelerating potential is increased to 4 V?
5)
Red light however bright it is, cannot produce the emission of electrons from a clean zinc surface, but even weak ultraviolet radiation can do so; why?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
List out the laws of photoelectric effect. (or) Write any three Laws of Photoelectric Effect
2)
When the electron orbiting in a hydrogen atom in its ground state moves to the third excited state, show how the de Broglie wavelength associated with it would be affected?
3)
The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B. Which one of the two has higher value of workfunction? Justify your answer.
4)
Show the variation of photocurrent with collector plate potential for different frequencies but same intensity of incident radiation.
5)
(i) Draw a graph showing variation of photoelectric current (I) with anode potential (V) for different intensities of incident radiation. Name the characteristic of the incident radiation that is kept constant in this experiment.
(ii) If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

12th Standard English Medium Physics Subject Ray Optics Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is principal axis of the mirror?
2)
What is focus (or) focal point of a mirror?
3)
Write the difference between paraxial rays and marginal rays.
4)
What is thin lens?
5)
Use the lens equation to deduce algebraically the following:
"An object placed within the focus of a convex lens produces a virtual and enlarged image".

12th Standard English Medium Physics Subject Ray Optics Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the conditions for nature of objects and images.
2)
What is focus (or) focal point of a mirror?
3)
Define refractive index of a medium.
4)
An object is placed at the principal focus of a convex lens. Determine the position of the image making use of the lens equation.
5)
The image of a candle is formed by a convex lens on a screen. The lower half of the lens is painted black to make it completely opaque. Draw the ray diagram to show the image formation. How will this image be different from the one obtained when the lens is not painted black?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write an expression for the momentum of Electromagnetic wave.
2)
Write the uses of Infrared radiation
3)
Write the frequency source of production and uses of Ultraviolet radiation.
4)
Write the production of gamma rays and mention its properties and uses.
5)
Identify the following Electromagnetic radiations
(a) 10⁹ Hz
(b) 10¹¹ Hz. Give one application of each.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The charge on a parallel plate capacitor varies as q = q_o cos 2\(\pi \gamma \)t. The plates are very large and close together. (area - A. separation - d) find the displacement current through the capacitor?
2)
A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.
3)
How does Ampere - Maxwell law expalain the flux of current trough a capacitor when it is being charged by a battery? write the expression for the displacement current in terms of the rate of change of electric flux.
4)
Identify the Electromagnetic waves whose wavelength vary as
(a) 10^-12 m to 10^-8 m
(b) 10^-4m and write their uses.
5)
Name the parts of Electromagnetic spectrum which is
(i) used to destroy becteria.
(ii) produced by where is a sudden deceleration of high speed electrons.
(iii) used in food industry.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Distinguish between average & rms value of an AC.
2)
What is Phasort and How to draw phasor diagram.
3)
How does the capacitive reactance depend on frequency? & What is the reactance of a capacitor at hertz to the study at?
4)
What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.
5)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is Phasort and How to draw phasor diagram.
2)
How does the capacitive reactance depend on frequency? & What is the reactance of a capacitor at hertz to the study at?
3)
What is the phase relation between current and emf in an AC circuit containing a cpacitor only? Sketch a graph showing the variation the reactance of a capacitor with frequency.
4)
Give and explain the mechanical analogy of LC oscillations by qualitative treatment.
5)
What is the phase difference between
(i) the voltage across L and C in an LCR circuit connected to an a.c source
(ii) applied a.c voltage and current in LCR circuit at resonance?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Two identical charged produces moving with the same speed enter a region of uniform magnetic field. If one of these enters normal to the field direction and the other enters along a direction at 30° with the field. What would be the ratio of their angular frequencies.
2)
A long straight wire AB carries a current I. A proton P travels with a speed v, parallel to the wire, at a distance d from it in a direction opposite to the current as shown in figure what is the force experienced by the proton and what is its direction?
3)
Can a galvanometer be used for measuring the current? Explain.
4)
A given galvanometer is to be converted into
(i) an ammeter
(ii) a voltmeter.
In which case will the required resistance be
(i) least
(ii) highest and why?
5)
State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are the types of magnets? Give example.
2)
Write the Properties of magnet.
3)
Mention the properties of Magnetic field lines?
4)
Tabulate the difference between Coulomb's law and Biot-Savort's law.
5)
State that a current carrying loop behaves as a magnetic dipole. Hence write an expression for its magnetic dipole moment.

12th Standard English Medium Physics Subject Current Electricity Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are carbon resistors? What does the colour indicates?
2)
How does one can understand the temperature dependence of resistivity of a conductor?
3)
What is meant by electromotive force?
4)
In a circuit containing internal resistance r. Find the power delivered.
5)
State Joule's law.

12th Standard English Medium Physics Subject Current Electricity Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Derive an expression of drift velocity and write the relation between drift velocity and mobility.
2)
(a) Distinguish between electric cells and batteries.
(b) Explain its function.
3)
Derive a relation between internal resisance and emf of a cell.
4)
Find the expression for the equivalent emf & internal resistance of the series combination of cells.
5)
Explain Peltier effect.

12th Standard English Medium Physics Subject Electrostatics Creative 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Deduce an expression for the electric field due to the system of point charges.
2)
What is principle used in Microwave oven? Explain.
3)
Derive the expressions for the potential energy of a system of point charges.
4)
Derive an expression for electric flus in a non uniform electric field and an arbitrarily shaped area.
5)
Write the special features of Gauss law.

12th Standard English Medium Physics Subject Electrostatics Creative 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Define potential difference and derive.
2)
How is electric flux is related to electric field.
3)
Deduce electric flus for closed surfaces.
4)
What is dielectrics or insulators.
5)
Define and derive an expression for the energy density in parallel plate capacitor.

12th Standard English Medium Physics Subject Electronics and Communication Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What do you mean by communication?
2)
Write the function of Repeater.
3)
Why sky waves are not used in the transmission of T.V. signals?
4)
What is modulated wave?
5)
What do you mean by noise in communication?

12th Standard English Medium Physics Subject Electronics and Communication Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is barrier potential?
2)
Define forward bias.
3)
What is forward V-I characteristics?
4)
What is meant by efficiency (η)?
5)
Mention any three application Zener diode.

12th Standard English Medium Physics Subject Wave Optics Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is astigmatism? What is its remedy?
2)
What is known as constructive interference?
3)
Define bandwidth.
4)
Write the expression for angular resolution.
5)
Define interference of light.

12th Standard English Medium Physics Subject Wave Optics Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Why is the interference pattern not detected when two coherent sources are far apart?
2)
A telescope has been adjusted for relaxed eye. You are asked to adjust it for least distance of distinct vision, then how will you change the distance between two lenses?
3)
Does the magnifying power of a microscope depend on the colour of the light used? Justify your answer.
4)
How does the fringe width of interference fringes change, when the whole apparatus Young's experiment is kept in water (refractive index 4/3)?
5)
What are coherent sources of light?

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is the two important phenomena that govern the nano particles?
2)
How does the manipulation of colours obtain in nanoscale structure?
3)
What is the use of nano paints?
4)
Who invented Unimate?
5)
What are the material used to make robots?

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are God particles?
2)
Write thekey components of robot.
3)
What is the use of industrial robots?
4)
Define nano solid?
5)
What is use of robotics?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Which ray has high ionising power? Why?
2)
What is nuclear chain reaction?
3)
What are the essential parts of a nuclear reactor?
4)
Define Roentgen.
5)
What is the reason for using lighter nuclei as moderators?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Why neutrons in the nucleus are stable?
2)
What causes the sun to expand?
3)
The ground state energy of hydrogen atom is -13.6 eV. What are k.E & P.E of the electron in this state?
4)
What are thermal neutrons? Why are neutrons considered as ideal particles for nuclear fission?
5)
Give the mass number and atomic number of elements on the right-hand side of the decay process \(_{ 86 }^{ 220 }{ Rn }\) ⇾ Po + He.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Does the stopping potential in photoelectric emission depend upon
(i) the intensity of the incident radiation in a photocell
(ii) the frequency of the incident radiation?
2)
With what purpose was famous Davisson-Germer experiment with electrons performed?
3)
Which of the two :
(i) light or
(ii) moving material particle is concerned with de-Broglie hypothesis?
4)
If the intensity of light falling on a metal plate is doubled, what will be the effect on photocurrent and maximum kinetic energy of emitted photoelectrons?
5)
The de Broglie wavelength associated with an electron accelerated through a potential difference V is λ. What will be its wavelength when the accelerating potential is increased to 4V?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Work function of aluminium is 4.2 eV. If two photons, each of energy 2.5 eV, are incident on It surtace, will the emission of electrons take place? Justify your answer
2)
Define the term 'stopping potential' in relation to photoelectric effect.
3)
The stopping potential in an experiment on photoelectric effect is 2V. What is the maximum kinetic energy of the photoelectrons emitted?
4)
Define intensity of radiation on the basis of photon picture of light. Write its SI unit.
5)
If the intensity of radiation in a photocell is increased how does the stopping potential vary?

12th Standard English Medium Physics Subject Ray Optics Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled?
2)
The image of a candle formed by a convex lens is obtained on a screen. Will full size of the image be obtained if the lower half of the lens is painted completely opaque?
3)
For the same angle of incidence, the angles of refraction in media P, Q and R are 35°, 25°, 15° respectively. In which medium will the velocity of light be minimum?
4)
The image of an object formed by a lens on the screen is not in sharp focus. Suggest a method to get a dear focussing of the image on the screen without disturbing the positions of the object, the lens or the screen.
5)
A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the surfaces of the lens facing the object and image are interchanged will the position of the image change?

12th Standard English Medium Physics Subject Ray Optics Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Define centre of curvature.
2)
Define pole.
3)
What is meant by focal plane?
4)
What are the assumptions made while considering refraction at spherical surfaces?
5)
What is simultaneous reflection?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the uses of Micro waves.
2)
(i) In which situation is there a displacement current but no conduction current?
(ii) Find the displacement current across the plate of the capacitor whose charging current is 0.25 A.
3)
Why are Infrared radiation referred to as heatwaves? Name the radiations, which are next to these radiation having
(i) shorter λ
(ii) longer λ.
4)
Which part of Electromagnetic is absorbed from sunlight by ozone layer?
(i) Write its source and
(ii) mention its uses.
5)
What is the orgin of displacement currtent?

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the uses of Radio waves.
2)
(i) How is the speed of Electromagnetic waves in vacuum determined by the electric and magnetic fields? and
(ii) Do Electromagnetic waves carry energy and momentum?
3)
Arrange the Electromagnetic waves in order of
(i) increasing frequency
(ii) decreasing wavelength.
4)
Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?
5)
Draw a diagram depicting oscillating electric and magnetic field of an electromagnetic wave.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Explain the use of transformers in long distance transmission of electric power.
2)
What is meant by Sinusoidal alternating voltage and current? Give its expression.
3)
Distinguish between AC and DC.
4)
Draw a graph showing variation of current with changing frequency of applied voltage in a series LCR circuit for two different values of resistance R1 & R2 (I₁ > I₂) fr - resonant frequency.
5)
When does the phenomenon of resonance is possibble in the circuit?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the application of series RLC resonant circut
2)
What is the signifienance of Quality factor or Q-factor.
3)
Define power factor?
4)
State the law that gives the polarity of the induced emf.
5)
Find the direction of the induced current in the rectangular loop P&RS is moving into a uniform magnetic field acting at right angles to the plane of the paper.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
State the factors on which the current sensitivity of a galvanometer is increased.
2)
Define Voltage sensitivity?
3)
In what way is the behaviour of a diamagnetic material different from that of a paramagnetic when kept in an external magnetic field?
4)
What is magnetic Lorentz force?
5)
The magnetic field lines prefer to pass through iron than why?

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Write the Similarities between Coulomb's law and Biot-Savort's law.
2)
What is magnetic Lorentz force?
3)
What is Cyclotron? State the principle of Cyclotron.
4)
When is a galvanometer said to be sensitive?
5)
State the factors on which the current sensitivity of a galvanometer is increased.

12th Standard English Medium Physics Subject Current Electricity Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What happens to the drift velocity of electron and to the resistance if length of conductor and to the resistance if length of conductor unchanged?
2)
Draw V - I graph for ohmic & non -ohmic materials. Give example.
3)
Mention are limitation of carbon resistors.
4)
Two wires A & B are of the same metal of the same length have area of the cross-section in the ratio of 2: 1. If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?
5)
Show variation of resistivity of
(i) conductor (i.e. copper)
(ii) semiconductor
(ii) with temperature in a graph. Give reason.

12th Standard English Medium Physics Subject Current Electricity Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Distinguish between ohmic & non-ohmic device.
2)
What is the effective resistance of resistors connected in series?
3)
Define the term electric power and circuit its SI unit.
4)
Define electric energy state its commercial units.
5)
What do you mean by a series combination of cells?

12th Standard English Medium Physics Subject Electrostatics Creative 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What is the work zone by the field in moving a small positive charge from A to P? Given reason.
2)
What are the factors on which the capacity of a parallel plate capacitor with dielectric depend?
3)
The graph shown here shows the variation of total energy (E) stored in a capacitor against the value of the capacitance (c) itself. Which of the two is kept constant for this graph, whatever the charge an capacitor of the potential used to charge it?
4)
Gauss law is true for any closed surface, no matter what its shape or size is. Justify.
5)
The given graph shows the variation of charge q versus potential difference V for 2 capacitors C, & C₂. The two capacitors have same plate separation but the area of plate C₂, is twice that of C₁, which of the two graphs P & Q correspond to capacitors C₁ & C₂, why?

12th Standard English Medium Physics Subject Electrostatics Creative 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
What are induced dipoles.
2)
What is a Capacitor?
3)
(i) Two insulated charged copper spheres A & B of identical size have charges qn and -3q_A respectively. When they are brought in contact with each other and then separated. What are the new charges on them?
(ii) When third sphere of some size but uncharged is brought in contact with first and then second and finally removed? What are the new charges.
4)
A charge Q μC is placed at the centre of a cube what would be the
(i) flux through one face?
(ii) flux passing through two opposite faces of the cube?
Electric flux through whole cube \(\frac { Q }{ { \varepsilon }_{ 0 } } \)
5)
(i) Electric field lines donot have sudden breaks why is it so?
(ii) Explain why two field lines never cross each other at any point.

12th Standard English Medium Physics Subject Electronics and Communication Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
In FM, frequency variation of the carrier wave depends upon the ___________ amplitude of the signal.
2)
The change in the resting frequency of a FM transmitter is called ________
3)
FM signal has a resting frequency of 105 MHz and the highest frequency of 105.03 MHz when modulated by a signal. Then the carrier swing is ____________.
4)
In FM, the centre frequency is allotted to the _________.
5)
Noise is a form of __________ variation.

12th Standard English Medium Physics Subject Electronics and Communication Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
The behaviour of Ge as semi-conductor is due to width of ___________.
2)
For a transistor \(\frac{I_C}{I_E}\) = 0.96, then CE current gain is ______________.
3)
In Si-crystal, impurity donor atom have valency ________________.
4)
A full wave rectifier is operating at 50 Hz, 220v the fundamental frequency of ripple will be __________.
5)
Digital circuits can be made to be respective use of ______________.

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 18, 2021 - View & Read

1)
Best example for applications of nanotechnology is ______________.
2)
Muscle wires can contract by _________ when electric current is passed through them.
3)
Chinese scientists have created the world's first autonomous _________ to combat caner tumours.
4)
Zno is an example of __________
5)
Bulk particles of nanoparticles are synthesized by ___________

12th Standard English Medium Physics Subject Recent Developments in Physics Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 18, 2021 - View & Read

1)
If the particle of a solid is of size less than 100 nm, it is said to be a ____________
2)
_______ is synthesized top down approach
3)
George Devel invented the first digitally operated programmable robot called ____________.
4)
The size of the Nano robots is reduced to ________ level to perform a task in very small space.
5)
In __________ it was established that atoms are made up of electrons, protons and neutrons

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
Oxides of Plutonium and Uranium are used as fuel for ________ reactors.
2)
Graphite is used as a __________ in nuclear reactors.
3)
The moderator used in nuclear reactor is ________________.
4)
In a nuclear reactor, cadmium rods are used to _____________
5)
The explosion of hydrogen bomb is based on the principle of _________________.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The unit of Rydberg constant is ______________.
2)
A Coolidge tube operates at 18600 V. The maximum frequency of X-radiation emitted from it is ______.
3)
The spectral series of hydrogen atom in UV region is called ____________.
4)
In a discharge tube, the source of positive rays is ________________.
5)
The ionisation potential of hydrogen atom is ______________.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
If the potential difference is increased by 9 times, the de-Broglie wavelength becomes ________ times the original.
2)
Find the energy released when 5.5 g of matter is used.
3)
The length of a moving scale is 6 m, whose velocity is 2 x 10⁷ m/s. Find its rest length.
4)
The highest magnification order that can be achieved using optical microscope is _________
5)
The number of de Broglie waves of an electron in the nth orbit of an atom is ___________.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
An electron of mass m and charge e is accelerated from rest through a potential difference of V volt in a vacuum. Its final speed will be ______________.
2)
Einstein's work on photoelectric effect gives support to _______________.
3)
Gases begin to conduct electricity at low pressure because ______________.
4)
The value of stopping potential when the frequency of light is equal to the threshold frequency is _________________.
5)
According to special theory of relativity the only constant in all frames is _____________.

12th Standard English Medium Physics Subject Ray Optics Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The light reflected by plane mirror may form a real images ____________.
2)
A small object is placed 10 cm in front of a plane mirror. If you stand behind the object 30 cm from the object and look at its image, the distance forced for your eye will be ____________.
3)
A ray of light is incident normally on a lane mirror. The angle of reflection will be _____________.
4)
When a plane mirror is rotated through an angle θ , then the reflected ray turns through the angle 2θ, then the size of the image _____________.
5)
Ray optics is valid, when characteristic dimensions are ______________.

12th Standard English Medium Physics Subject Ray Optics Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is _____________.
2)
Two plane mirrors are at right angles to each other. A man stands between them and combs hair with his right hand. In how many of the images will he be seen using his right-hand __________.
3)
A plane mirror produces a magnification of ____________.
4)
What should be the angle between two plane mirror so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other _____________.
5)
It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focused for a distance of ___________.

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
We can make long distance photographs using _________.
2)
_________ emission spectrum is used to identify the gas used.
3)
Carbon are produces ________ spectrum.
4)
A pure green glass plate when, placed in the path of white light, absorbs________.
5)
_________ spectra are used for making dyes

12th Standard English Medium Physics Subject Electromagnetic Waves Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The electric and magnetic field of an EM wave are _____________.
2)
Which EM waves are used in medicine to destroy cancer cells?
3)
The existence of E.M. waves was confirmed experimentally by __________________.
4)
A magnetic field is produced by ____________.
5)
Electromagnetic waves are discovered by _______________.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The unit of impedance is ________________
2)
For normal frequencies, the range of Q- factor is from _____________.
3)
The power factor of an a.c, circuit is _________
4)
In an LCR series a.c, circuit, the phase difference between current and voltage is 60°. If the net reactance of the circuit is 17.32Ω, the value of the resistance is ______________.
5)
The instantaneous current in an AC circuit containing a pure inductor is i = I_o sinωt, The instantaneous emf is ___________________.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
Which of the following cannot be stepped up in a transformer?
2)
If a secondary coil has 40 turns, and a primary coil with 20 turns is charged with 50V of potential difference, then potential difference in secondary would be ________________.
3)
Which current- time graph represents the steady movement of short magnet through a coil XY?
4)
The unit of self inductance is ________________.
5)
The self-inductance Lof a solenoid is given as _________________.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The magnitude of the magnetic Lorentz force does not depend on ______
2)
Force on unit length of two parallel wires carrying equal current kept apart by 3m in air is 2 x10^-7 N, then the current in each wire is ______
3)
No current flows between two charged particles when connected if they have same ______
4)
Torque acting on a coil is maximum when the coil is ______
5)
If a current 0.5mA produces a deflection of 156°, then the galvanometer constant is about, ______

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The angle of dip at a place, when horizontal and vertical components of earth's field are equal is ______________.
2)
When current is doubled deflection is also doubled in ______________.
3)
A long straight conductor carrying a current lies along the axis of a ring. The conductor will exert a force on the ring if _______________.
4)
The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.
5)
Consider the motion of a charged particle in a uniform magnetic field directed into the paper. If velocity v of the particle is in the plane of the paper, the charged particle will describe a _____________.

12th Standard English Medium Physics Subject Current Electricity Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The specific resistance of silicon is__________
2)
The electrical resistivity drops to zero for__________
3)
The phenomenon of superconductivity was first observed by__________
4)
The first theoretical explanation superconductivity was given by_______
5)
Super conductors can be used as storage elements in_________

12th Standard English Medium Physics Subject Current Electricity Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
If the specific resistance of a potentiometer wire is 10^-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10^-6 m², then potential gradient will be ________________.
2)
In an electrical arrangement as shown the equivalent resistance between X and Y will be
3)
A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?
4)
An unknown resistance is connected in parallel with a 15\(\Omega \) resistance and a 12V battery. What is the value of the unknown resistance if the current in the circuit is 2A?
5)
How many 160 \(\Omega \) resistor in parallel are required to carry a current of 5 A on a 100 V line?

12th Standard English Medium Physics Subject Electrostatics Creative 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The electric flux is ________ if the electric field lines enter the closed surface.
2)
Which of the following is a scalar quantity?
3)
When a point charge of 6mC is moved between two points in an electric field, the work done is 1.8 x 10^-5 J. The potential difference between the two points is
4)
When the amber is rubbed with fur, it absorbs bits of papers. This was invented by_______.
5)
The charge of an electron is _________.

12th Standard English Medium Physics Subject Electrostatics Creative 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 17, 2021 - View & Read

1)
The electrostatic force obeys _______.
2)
The value of constant 'K' in coulomb law is _____________.
3)
The relative permittivity of water is _______.
4)
The figure shows tow parallel equipotential surface A and B kept at a small distance 'r' a part from each other. A point change of Q coulomb is taken from the surface A to B. The amount of net work done will be
5)
An uncharged metal sphere is placed between two equal and oppositely charged metal plates. The nature of lines of force will be ______________

12th Standard English Medium Physics Subject Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
2)
Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?
3)
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
4)
A flat dielectric disc of radius R carries an excess charge on its surface. The surface charge density is σ. The disc rotates about an axis perpendicular to its plane passing through the center with angular velocity ω. Find the magnitude of the torque on the disc if it is placed in a uniform magnetic field whose strength is B which is directed perpendicular to the axis of rotation.
5)
The flux linked with a coil at any instant t is given by \(\Phi\)_B = 10t²− 50t + 250. The induced emf at t = 3s is

12th Standard English Medium Physics Subject Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Which charge configuration produces a uniform electric field?
2)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
3)
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
4)
A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is ______.
5)
A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current I = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the centre of the spiral is ______.

12th Standard English Medium Physics Subject Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
The electric field lines never intersect. Justify.
2)
What is dielectric strength?
3)
Define electrical resistivity.
4)
What is Thomson effect?
5)
State Biot-Savart’s law.

12th Standard English Medium Physics Subject Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Write down Coulomb’s law in vector form and mention what each term represents.
2)
Write a short note on superconductors?
3)
Define ampere.
4)
What is meant by mutual induction?
5)
What is principle of reversibility?

12th Standard English Medium Physics Subject Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Calculate the number of electrons in one coulomb of negative charge.
2)
Calculate the electric field at points P, Q for the following two cases, as shown in the figure.
(a) A positive point charge +1 μC is placed at the origin.
(b) A negative point charge -2 μC is placed at the origin.
3)
Derive an expression for the torque experienced by a dipole due to a uniform electric field.
4)
Obtain the expression for energy stored in the parallel plate capacitor.
5)
The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?

12th Standard English Medium Physics Subject Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 x 10^–11 m. The magnitude of charges on the electron and proton are 1.6 x 10^–19 C. Mass of the electron is m_e = 9.1 x 10^–31 kg and mass of proton is m_p = 1.6 x 10^–27 kg.
2)
A block of mass m carrying a positive charge q is placed on an insulated frictionless inclined plane as shown in the figure. A uniform electric field E is applied parallel to the inclined surface such that the block is at rest. Calculate the magnitude of the electric field E.
3)
Discuss the various properties of conductors in electrostatic equilibrium.
4)
Describe the microscopic model of current and obtain general form of Ohm’s law.
5)
The repulsive force between two magnetic poles in air is 9 x 10^–3 N. If the two poles are equal in strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.

12th Standard English Medium Physics Subject Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A water molecule has an electric dipole moment of 6.3 x 10^-30 Cm. A sample contains 10²² water molecules, with all the dipole moments aligned parallel to the external electric field of magnitude 3 x 10⁵ NC^-1. How much work is required to rotate all the water molecules from θ = 0° to 90°?
2)
A parallel plate capacitor filled with mica having ε_r = 5 is connected to a 10 V battery. The area of the parallel plate is 6 cm² and separation distance is 6 mm.
(a) Find the capacitance and stored charge.
(b) After the capacitor is fully charged, the battery is disconnected and the dielectric is removed carefully.
Calculate the new values of capacitance, stored energy and charge.
3)
The total number of electrons in the human body is typically in the order of 10²⁸. Suppose, due to some reason, you and your friend lost 1% of this number of electrons. Calculate the electrostatic force between you and your friend separated at a distance of 1m. Compare this with your weight. Assume mass of each person is 60 kg and use point charge approximation.
4)
A point charge of +10 μC is placed at a distance of 20 cm from another identical point charge of +10 μC. A point charge of -2 μC is moved from point a to b as shown in the figure. Calculate the change in potential energy of the system? Interpret your result.
5)
For the given capacitor configuration
(a) Find the charges on each capacitor
(b) potential difference across them
(c) energy stored in each capacitor

12th Standard English Medium Physics Subject Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.
2)
Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will get fused?
3)
What is the magnetic field at the centre of the loop shown in figure?
4)
A rectangular coil of area 70 cm² having 600 turns rotates about an axis perpendicular to a magnetic field of 0.4 Wb m^–2.If the coil completes 500 revolutions in a minute, calculate the instantaneous emf when the plane of the coil is
(i) perpendicular to the field
(ii) parallel to the field and
(iii) inclined at 60^o with the field.
5)
A 400 mH coil of negligible resistance is connected to an AC circuit in which an effective current of 6 mA is flowing. Find out the voltage across the coil if the frequency is 1000 Hz.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R₁.
2)
Four silicon diodes and a 10 Ω resistor are connected as shown in figure below. Each diode has a resistance of 1Ω. Find the current flows through the 10Ω resistor.
3)
A transistor having α = 0.99 and V_BE = 0.7V, is connected in the common-cmiitter configuration as shown in figure. If the transister is in saturation region, find the value of the collector current.
4)
In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter-base voltage V_EB = 600 mV, calculate the emitter-collector voltage V_EC(in volts).

12th Standard English Medium Physics Subject Electronics and Communication Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
The current gain of a common emitter transistor circuit shown in figure is 120. Draw the DC load line and mark the Q point on it. (V_BEto be ignored).
2)
Calculate the range of the variable capacitor that is to be used in a tuned-collector oscillator which has a fixed inductance of 150 μH. The frequency band is from 500 kHz to 1500 kHz.
3)
What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?
4)
In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.
5)
Prove the Boolean identity AC + ABC = AC and give its circuit description.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Consider two hydrogen atoms H_A and H_B in ground state. Assume that hydrogen atom H_A is at rest and hydrogen atom H_B is moving with a speed and make head-on collision with the stationary hydrogen atom H_A. After the collision, both of them move together. What is minimum value of the kinetic energy of the moving hydrogen atom H_B, such that any one of the hydrogen atoms reaches first excitation state.
2)
(a) A hydrogen atom is excited by radiation of wavelength 97.5 nm. Find the principal quantum number of the excited state
(b) Show that the total number of lines in emission spectrum is \(\frac { n(n-1) }{ 2 } \) Compute the total number of possible lines in emission spectrum as given in(a).
3)
Calculate the mass defect and the binding energy per nucleon of the \(_{ 47 }^{ 108 }{ Ag }\) nucleus. [atomic mass of Ag = 107.905949]
4)
On your birthday, you measure the activity of the sample ²¹⁰Bi which has a half-life of 5.01 days. The initial activity that you measure is 1µCi.
(a) What is the approximate activity of the sample on your next birthday? Calculate
(b) the decay constant
(c) the mean life
(d) initial number of atoms.
5)
Assuming that energy released by the fission of a single \(_{ 92 }^{ 235 }{ U }\) nucleus is 200MeV, calculate the number of fissions per second required to produce 1-watt power.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Calculate the radius of the earth if the density of the earth is equal to the density of the nucleus.[mass of earth 5.97 x 10²⁴ kg].
2)
Half lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. Calculate the ratio of decayed numbers of A and B nuclei after 80 minutes.
3)
Calculate the time required for 60% of a sample of radon undergo decay. Given T_1/2of radon = 3.8 days.
4)
Show that the mass of radium \((_{ 88 }^{ 226 }{ Ra })\) with an activity of 1 curie is almost a gram. Given T_1/2 = 1600 years.
5)
Compute the binding energy of \(_{ 2 }^{ 4 }{ He }\) nucleus using the following data: Atomic mass of Helium atom M_A(He) = 4.00260u and that of hydrogen atom, m_H= 1.00785u.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Calculate the maximum kinetic energy and maximum velocity of the photoelectrons emitted when the stopping potential is 81 V for the photoelectric emission experiment.
2)
A 150 W lamp emits light of mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.
3)
What should be the velocity of the electron so that its momentum equals that of 4000 Å wavelength photon.
4)
When a 6000Å light falls on the cathode of a photo cell, photoemission takes place. If a potential of 0.8 V is required to stop emission of electron, then determine the
(i) frequency of the light
(ii) energy of the incident photon
(iii) work function of the cathode material
(iv) threshold frequency and
(v) net energy of the electron after it leaves the surface.
5)
At the given point of time, the earth receives energy from sun at 4 cal cm^–2min^–1. Determine the number of photons received on the surface of the Earth per cm² per minute. (Given: Mean wavelength of sun light = 5500 Å )

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
At the given point of time, the earth receives energy from sun at 4 cal cm^–2min^–1. Determine the number of photons received on the surface of the Earth per cm² per minute. (Given: Mean wavelength of sun light = 5500 Å )
2)
Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10^–15 J. (Given: mass of proton is 1836 times that of electron).
3)
The ratio between the de Broglie wavelength associated with proton, accelerated through a potential of 512 V and that of alpha particle accelerated through a potential of X volts is found to be one. Find the value of X.
4)
Find the de Broglie wavelength associated with an alpha particle which is accelerated through a potential difference of 400 V. Given that the mass of the proton is 1.67 x 10^–27kg.
5)
Calculate the cut-off wavelength and cutoff frequency of x-rays from an x-ray tube of accelerating potential 20,000 V.

12th Standard English Medium Physics Subject Ray Optics Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the object distance if the image obtained is magnified 4 times.
2)
An object is placed in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.
3)
A thin converging lens of refractive index 1.5 has a power of + 5.0 D. When this lens is immersed in a liquid of refractive index n, it acts as a divergent lens of focal length 100 cm. What must be the value of n?
4)
In Young's double-slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two-wavelength λ₀= 750 nm and λ = 900mm. What is the minimum distance from the common central bright fringe on a screen 2 m from the slits where a bright fringe from one interference pattern coincides with a . bright fringe from the other?
5)
Two light sources with amplitudes 5 units and 3 units respectively interfere with each other. Calculate the ratio of maximum and minimum intensities.

12th Standard English Medium Physics Subject Ray Optics Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Two polaroids are kept with their transmission axes inclined at 30^o. Unpolarised light of intensity I falls on the first polaroid. Find out the intensity of light emerging from the second polaroid.
2)
Find the polarizing angles for
(i) glass of refractive index 1.5 and
(ii) water of refractive index 1.33.
3)
A man with a near point of 25 cm reads a book which has small print using a magnifying lens of focal length 5 cm.
(a) What are the closest and the farthest distances at which he should keep the lens from the book?
(b) What are the maximum and the minimum magnification possible?
4)
A small telescope has an objective lens of focal length 125 cm and an eyepiece of focal length 2 cm.
(a) What is the magnification of the telescope?
(b) What is the separation between the objective and the eyepiece?
(c) What is the angular separation between two stars when viewed through this telescope if they subtend 1' for bare eye?
5)
A person has farsightedness with the far distance he could see clearly is 75 cm. Calculate the power of the lens of the spectacles needed to rectify the defect.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 x 10⁴N C^–1 and 2 x 10^–4 T, respectively.
2)
A magnetron in a microwave oven emits electromagnetic waves (em waves) with frequency f = 2450 MHz. What magnetic field strength is required for electrons to move in circular paths with this frequency?
3)
Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.
4)
A transmitter consists of LC circuit with an inductance of 1 µH and a capacitance of 1 µF. What is the wavelength of the electromagnetic waves it emits?
5)
Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y-direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 x 10⁴N C^–1 and 2 x 10^–4 T, respectively.
2)
Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.
3)
A pulse of light of duration 10⁻⁶s is absorbed completely by a small object initially at rest. If the power of the pulse is 60\(\times\) 10⁻³ W. Calculate the final momentum of the object.
4)
Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 10¹⁰ Hz and has an amplitude of 10⁻⁵ T, acting along the y-direction. Then, compute the wavelength of the wave. Also write down the expression for electric field in this case.
5)
If the relative permeability and relative permittivity of a medium are 1.0 and 2.25 respectively, find the speed of the electromagnetic wave in this medium.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
An ideal transformer has 460 and 40,000 turns in the primary and secondary coils respectively. Find the voltage developed per turn of the secondary if the transformer is connected to a 230 V AC mains. The secondary is given to a load of resistance 10⁴ Ω. Calculate the power delivered to the load.
2)
Write down the equation for a sinusoidal voltage of 50 Hz and its peak value is 20 V. Draw the corresponding voltage versus time graph.
3)
The equation for an alternating current is given by i = 77 sin 314t. Find the peak current, frequency, time period and instantaneous value of current at t = 2 ms.
4)
A capacitor of capacitance \(\\ \frac { { 10 }^{ 2 } }{ \pi } \mu F\\ \) is connected across a 220 V, 50 Hz A.C. mains. Calculate the capacitive reactance, RMS value of current and write down the equations of voltage and current.
5)
A series RLC circuit which resonates at 400 kHz has 80 μH inductors, 2000 pF capacitor and 50 Ω resistor. Calculate
(i) Q-factor of the circuit
(ii) the new value of capacitance when the value of inductance is doubled and
(iii) the new Q-factor.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
The 300 turn primary of a transformer has resistance 0.82 Ω and the resistance of its secondary of 1200 turns is 6.2 Ω. Find the voltage across the primary if the power output from the secondary at 1600V is 32 kW. Calculate the power losses in both coils when the transformer efficiency is 80%.
2)
A graph between the magnitude of the magnetic flux linked with a closed loop and time is given in the figure. Arrange the regions of the graph in ascending order of the magnitude of induced emf in the loop.
3)
A flexible metallic loop abcd in the shape of a square is kept in a magnetic field with its plane perpendicular to the field. The magnetic field is directed into the paper normally. Find the direction of the induced current when the square loop is crushed into an irregular shape as shown in the figure.
4)
In series LC circuit, the voltages across L and C are 180° out of phase. Is it correct? Explain.
5)
Draw graphs showing the distribution of charge in a capacitor and current through an inductor during LC oscillations with respect to time. Assume that the charge in the capacitor is maximum initially.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Show that for a straight conductor, the magnetic field
\(\overset { \rightarrow }{ B } =\frac { { \mu }_{ ° }I }{ 4\pi a } (cos\varphi _{ 1 }-cos\varphi _{ 2 })\hat { n } \)
\(=\frac { { \mu }_{ ° }I }{ 4\pi a } (sin{ \theta }_{ 1 }+sin{ \theta }_{ 2 })\hat { n } \)
2)
Compute the magnitude of the magnetic field of a long, straight wire carrying a current of 1 A at distance of 1m from it. Compare it with Earth’s magnetic field.
3)
A particle of charge q moves with velocity\(\vec { v } \) along positive y-direction in a magnetic field \(\vec { B } \) .Compute the Lorentz force experienced by the particle
(a) when magnetic field is along positive y - direction
(b) when magnetic field points in positive z - direction
(c) when magnetic field is in zy - plane and making an angle θ with velocity of the particle. Mark the direction of magnetic force in each case
4)
An electron moving perpendicular to a uniform magnetic field 0.500 T undergoes circular motion of radius 2.50 mm. What is the speed of electron?
5)
Two singly ionized isotopes of uranium \(_{ 92 }^{ 235 }{ U \ and \ _{ 92 }^{ 238 }{ U } }\) (isotopes have same atomic number but different mass number) are sent with velocity 1.00 x 10⁵ m s^–1 into a magnetic field of strength 0.500 T normally. Compute the distance between the two isotopes after they complete a semi-circle. Also, compute the time taken by each isotope to complete one semi-circular path. (Given: masses of the isotopes: m₂₃₅ = 3.90 x 10^–25 kg and m₂₃₈ = 3.95 x 10^–25 kg)

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A particle of charge q moves with velocity\(\vec { v } \) along positive y-direction in a magnetic field \(\vec { B } \) .Compute the Lorentz force experienced by the particle
(a) when magnetic field is along positive y - direction
(b) when magnetic field points in positive z - direction
(c) when magnetic field is in zy - plane and making an angle θ with velocity of the particle. Mark the direction of magnetic force in each case
2)
An electron moving perpendicular to a uniform magnetic field 0.500 T undergoes circular motion of radius 2.50 mm. What is the speed of electron?
3)
Two singly ionized isotopes of uranium \(_{ 92 }^{ 235 }{ U \ and \ _{ 92 }^{ 238 }{ U } }\) (isotopes have same atomic number but different mass number) are sent with velocity 1.00 x 10⁵ m s^–1 into a magnetic field of strength 0.500 T normally. Compute the distance between the two isotopes after they complete a semi-circle. Also, compute the time taken by each isotope to complete one semi-circular path. (Given: masses of the isotopes: m₂₃₅ = 3.90 x 10^–25 kg and m₂₃₈ = 3.95 x 10^–25 kg)
4)
Suppose a cyclotron is operated to accelerate protons with a magnetic field of strength 1 T. Calculate the frequency in which the electric field between two Dees could be reversed.
5)
Consider a circular wire loop of radius R, mass m kept at rest on a rough surface. Let I be the current flowing through the loop and be the magnetic field acting along horizontal as shown in Figure. Estimate the current I that should be applied so that one edge of the loop is lifted off the surface?

12th Standard English Medium Physics Subject Current Electricity Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A battery has an emf of 12 V and connected to a resistor of 3 Ω. The current in the circuit is 3.93 A. Calculate
(a) terminal voltage and the internal resistance of the battery
(b) power delivered by the battery and power delivered to the resistor
2)
For the given circuit

Find
i) Equivalent emf
ii) Equivalent internal resistance
iii) Total current (I)
iv) Potential difference across each cell
v) Current from each cell
3)
The following figure shows a complex network of conductors which can be divided into two closed loops like EACE and ABCA. Apply Kirchoff’s voltage rule(KVR)
4)
In a Wheatstone’s bridge P = 100 Ω, Q = 1000 Ω and R = 40 Ω. If the galvanometer shows zero deflection, determine the value of S.
5)
In a meter bridge experiment with a standard resistance of 15 Ω in the right gap, the ratio of balancing length is 3:2. Find the value of the other resistance.

12th Standard English Medium Physics Subject Current Electricity Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will get fused?
2)
From the given circuit,

Find
i) Equivalent emf of the combination
ii) Equivalent internal resistance
iii) Total current
iv) Potential difference across external resistance
v) Potential difference across each cell
3)
For the given circuit find the value of I.
4)
Calculate the current that flows in the 1 Ω resistor in the following circuit.
5)
What is the value of x when the Wheatstone’s network is balanced?
P = 500 Ω, Q = 800 Ω, R = x + 400, S = 1000 Ω

12th Standard English Medium Physics Subject Electrostatics Book Back 5 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Consider an electron travelling with a speed v_o and entering into a uniform electric field \(\vec{E}\) which is perpendicular to \(\vec { { v }_{ 0 } } \) as shown in the Figure. Ignoring gravity, obtain the electron’s acceleration, velocity and position as functions of time.
2)
The electrostatic potential is given as a function of x in figure (i) and (ii). (a) Calculate the corresponding electric fields in regions A, B, C and D for the Figure (i). (b) Plot the electric field as a function of x for the figure (ii).
3)
A point charge of +10 μC is placed at a distance of 20 cm from another identical point charge of +10 μC. A point charge of -2 μC is moved from point a to b as shown in the figure. Calculate the change in potential energy of the system? Interpret your result.
4)
An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage 5 V and separation distance h = 1 mm as shown in the figure.

(a) Calculate the time of flight for both electron and proton
(b) Suppose if a neutron is allowed to fall, what is the time of flight?
(c) Among the three, which one will reach the bottom first? (Take m_p = 1.6 x 10^-27 kg, m_e = 9.1 x 10^-31 kg and g = 10 m s^-2)
5)
For the given capacitor configuration
(a) Find the charges on each capacitor
(b) potential difference across them
(c) energy stored in each capacitor

12th Standard English Medium Physics Subject Electrostatics Book Back 5 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Consider a point charge +q placed at the origin and another point charge -2q placed at a distance of 9 m from the charge +q. Determine the point between the two charges at which electric potential is zero.
2)
Four charges are arranged at the corners of the square PQRS of side an as shown in the figure.
(a) Find the work required to assemble these charges in the given configuration.
(b) Suppose a charge q is brought to the center of the square, by keeping the four charges fixed at the corners, how much extra work is required for this?
3)
Calculate the electric flux through the rectangle of sides 5 cm and 10 cm kept in the region of a uniform electric field 100 NC^-1. The angle θ is 60°. If θ becomes zero, what is the electric flux?
4)
A small ball of conducting material having a charge +q and mass m is thrown upward at an angle θ to horizontal surface with an initial speed v_o as shown in the figure. There exists an uniform electric field E downward along with the gravitational field g. Calculate the range, maximum height and time of flight in the motion of this charged ball. Neglect the effect of air and treat the ball as a point mass.
5)
A parallel plate capacitor filled with mica having ε_r = 5 is connected to a 10 V battery. The area of the parallel plate is 6 cm² and separation distance is 6 mm.
(a) Find the capacitance and stored charge.
(b) After the capacitor is fully charged, the battery is disconnected and the dielectric is removed carefully.
Calculate the new values of capacitance, stored energy and charge.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Explain the ampitude modulation with necessary diagrams.
2)
Explain the ground wave propagation and space wave propagation of electromagnetic waves through space.
3)
Give the applications of lCT in mining and agriculture sectors.
4)
Fiber optic communication is gaining popularity among the various transmission media -justify.
5)
Explain the formation of depletion region and barrier potential in PN junction diode.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Explain the formation of depletion region and barrier potential in PN junction diode.
2)
Draw the circuit diagram of a half-wave rectifier and explain its working.
3)
Explain the construction and working of a full wave rectifier
4)
What is an LED? Give the principle of its operation with a diagram.
5)
Write a note on photodiode.

12th Standard English Medium Physics Subject Wave Optics Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Prove law of reflection using Huygens’ principle.
2)
Obtain the equation for resultant intensity due to interference of light.
3)
Discuss the interference in thin films and obtain the equations for constructive and destructive interference for transmitted and reflected light.
4)
Discuss the diffraction at a grating and obtain the condition for the m^th maximum.
5)
Discuss the experiment to determine the wavelength of different colours using diffraction grating.

12th Standard English Medium Physics Subject Wave Optics Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Discuss the experiment to determine the wavelength of monochromatic light using diffraction grating.
2)
Obtain the equation for resolving power of optical instruments.
3)
Explain about compound microscope and obtain the equation for the magnification.
4)
Explain the experimental determination of refractive index of the material of the prism using spectrometer.
5)
Mention different parts of spectrometer and explain the preliminary adjustments.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Discuss the applications of Nanomaterials in various fields.
2)
What are the possible harmful effects of usage of Nanoparticles? Why?
3)
Discuss the functions of key components in Robots?
4)
Elaborate any two types of Robots with relevant examples.
5)
Comment on the recent advancement in medical diagnosis and therapy.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Briefly explain the elementary particles present in nature.
2)
Find the (i) angular momentum (ii) velocity of the electron revolving in the 5^th orbit of hydrogen atom.
(h = 6.6 x 10^–34 Js, m = 9.1 x 10^–31 kg)
3)
The Bohr atom model is derived with the assumption that the nucleus of the atom is stationary and only electrons revolve around the nucleus. Suppose the nucleus is also in motion, then calculate the energy of this new system.
4)
Calculate the average atomic mass of chlorine if no distinction is made between its different isotopes?
5)
Calculate the density of the nucleus with mass number A.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Discuss the Millikan’s oil drop experiment to determine the charge of an electron.
2)
Discuss the spectral series of hydrogen atom.
3)
Explain in detail the nuclear force.
4)
Discuss the beta decay process with examples.
5)
Obtain the law of radioactivity.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Explain experimentally observed facts of photoelectric effect with the help of Einstein’s explanation.
2)
Derive an expression for de Broglie wavelength of electrons.
3)
Describe briefly Davisson – Germer experiment which demonstrated the wave nature of electrons.
4)
A radiation of wavelength 300 nm is incident on a silver surface. Will photoelectrons be observed? [work function of silver = 4.7 eV]
5)
The work function of potassium is 2.30 eV. UV light of wavelength 3000 Å and intensity 2 Wm^–2 is incident on the potassium surface.
i) Determine the maximum kinetic energy of the photo electrons
ii) If 40% of incident photons produce photo electrons, how many electrons are emitted per second if the area of the potassium surface is 2 cm²?

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Explain why photoelectric effect cannot be explained on the basis of wave nature of light.
2)
Obtain Einstein’s photoelectric equation with necessary explanation.
3)
Give the construction and working of photo emissive cell.
4)
Briefly explain the principle and working of electron microscope.
5)
For the photoelectric emission from cesium, show that wave theory predicts that
i) maximum kinetic energy of the photoelectrons (K_max) depends on the intensity I of the incident light.
ii) K_max does not depend on the frequency of the incident light and
iii) the time interval between the incidence of light and the ejection of photoelectrons is very long.
For the sake of simplicity, the following standard assumptions can be made when light is incident on the given material.
a) Light is absorbed in the top atomic layer of the metal
b) For a given element, each atom absorbs an equal amount of energy and this energy is proportional to its cross-sectional area A.
c) Each atom gives this energy to one of the electrons.
(Given: The work function for cesium is 2.14 eV and the power absorbed per unit area is 1.60 x 10^-6 Wm^-2 which produces a measurable photocurrent in cesium.)

12th Standard English Medium Physics Subject Ray Optics Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A monochromatic light is incident on an equilateral prism at an angle 30^o and is emergent at an angle of 75^o . What is the angle of deviation produced by the prism?
2)
Light ray falls at normal incidence on the first face and emerges gracing the second face for an equilateral prism.
(a) What is the angle of deviation produced?
(b) What is the refractive index of the material of the prism?
3)
The angle of minimum deviation for an equilateral prism is 37^o . Find the refractive index of the material of the prism.
4)
Find the dispersive power of a prism if the refractive indices of flint glass for red, green and violet colours are 1.613, 1.620 and 1.632 respectively.
5)
The wavelength of light from sodium source in vacuum is 5893Å. What are its
(a) wavelength,
(b) speed and
(c) frequency when this light travels in water which has a refractive index of 1.33.

12th Standard English Medium Physics Subject Ray Optics Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A coin is at the bottom of a trough containing three immiscible liquids of refractive indices 1.3, 1.4 and 1.5 poured one above the other of heights 30 cm, 16 cm, and 20 cm respectively. What is the apparent depth at which the coin appears to be when seen from air medium outside? In which medium the coin will appear?
2)
What is the radius of the illumination when seen above from inside a swimming pool from a depth of 10 m on a sunny day? What is the total angle of view? [Given, refractive index of water is 4/3]
3)
A optical fibre is made up of a core material with refractive index 1.68 and a cladding material of refractive index 1.44. What is the acceptance angle of the fibre if it is kept in air medium without any cladding?
4)
The thickness of a glass slab is 0.25 m. It has a refractive index of 1.5. A ray of light is incident on the surface of the slab at an angle of 60^o. Find the lateral displacement of the light when it emerges from the other side of the glass slab.
5)
Find the position of the image of a point object O in the two cases given. Take the radius of curvature of the surface R as 15 cm, n₁ = 1 and n₂ = 2.
Case i) O is located 10 cm to the left of the surface.
Case ii) O is located 30 cm to the left of the surface.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Consider a parallel plate capacitor which is connected to an 230 V RMS value and 50 Hz frequency. If the separation distance between the plates of the capacitor and area of the plates are 1 mm and 20 cm² respectively. Calculate the displacement current at t = 1 s.
2)
Write down Maxwell equations in integral form.
3)
Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic spectrum.
4)
Write down the properties of electromagnetic waves.
5)
Explain the types of emission spectrum.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.
2)
Write short notes on
(a) microwaves
(b) X - rays
(c) Radio waves
(d) Visible spectrum
3)
Explain the Maxwell’s modification of Ampere’s circuital law.
4)
Discuss the source of electromagnetic waves.
5)
Explain the types of absorption spectrum.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - Jun 01, 2021 - View & Read

1)
Mention the various energy losses in a transformer.
2)
Find out the phase relationship between voltage and current in a pure inductive circuit.
3)
Define inductive and capacitive reactance. Give their units.
4)
Prove that the total energy is conserved during LC oscillations.
5)
Compare the electromagnetic oscillations of LC circuit with the mechanical oscillations of blockspring system qualitatively to find the expression for angular frequency of LC oscillator.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - Jun 01, 2021 - View & Read

1)
A circular antenna of area 3 m² is installed at a place in Madurai. The plane of the area of antenna is inclined at 47^o with the direction of Earth’s magnetic field. If the magnitude of Earth’s field at that place is 4.1 x 10^–5 T find the magnetic flux linked with the antenna.
2)
A cylindrical bar magnet is kept along the axis of a circular solenoid. If the magnet is rotated about its axis, find out whether an electric current is induced in the coil.
3)
A straight conducting wire is dropped horizontally from a certain height with its length along east-west direction. Will an emf be induced in it? Justify your answer.
4)
The magnetic flux passes perpendicular to the plane of the circuit and is directed into the paper. If the magnetic flux varies with respect to time as per the following relation \(\Phi_B\) = (2t³+ 3t²+ 8t + 5)mWb, what is the magnitude of the induced emf in the loop when t = 3 s? Find out the direction of current through the circuit.
5)
A copper rod of length l rotates about one of its ends with an angular velocity ω in a magnetic field B as shown in the figure. The plane of rotation is perpendicular to the field. Find the emf induced between the two ends of the rod.

12th Standard English Medium Physics Subject Current Electricity Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Resistance of a material at 20^oC and 40^oC are 45 Ω and 85 Ω respectively. Find its temperature coefficient of resistivity.
2)
Describe the microscopic model of current and obtain general form of Ohm’s law.
3)
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
4)
Explain the equivalent resistance of a series and parallel resistor network.
5)
Explain the determination of the internal resistance of a cell using voltmeter.

12th Standard English Medium Physics Subject Current Electricity Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?
2)
The resistance of a wire is 20 Ω. What will be new resistance, if it is stretched uniformly 8 times its original length?
3)
Consider a rectangular block of metal of height A, width B and length C as shown in the figure.

If a potential difference of V is applied between the two faces A and B of the block (figure (a)), the current I_AB is observed. Find the current that flows if the same potential difference V is applied between the two faces B and C of the block (figure (b)). Give your answers in terms of I_AB.
4)
Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across each resistors in the circuit.
5)
Calculate the equivalent resistance in the following circuit and also find the values of current I, I₁ and I₂ in the given circuit.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Let the magnetic moment of a bar magnet be \(\overset { \rightarrow }{ { p }_{ m } } \) whose magnetic length is d = 2l and pole strength is q_m. Compute the magnetic moment of the bar magnet when it is cut into two pieces
(a) along its length
(b) perpendicular to its length.
2)
Calculate the magnetic flux coming out from closed surface containing magnetic dipole (say, a bar magnet) as shown in figure.
3)
A short bar magnet has a magnetic moment of 0.5 J T^–1. Calculate magnitude and direction of the magnetic field produced by the bar magnet which is kept at a distance of 0.1 m from the centre of the bar magnet along
(a) axial line of the bar magnet and
(b) normal bisector of the bar magnet.
4)
Consider a magnetic dipole which on switching ON external magnetic field orient only in two possible ways i.e., one along the direction of the magnetic field (parallel to the field) and another anti-parallel to magnetic field. Compute the energy for the possible orientation.
5)
Compute the intensity of magnetisation of the bar magnet whose mass, magnetic moment and density are 200 g, 2 A m² and 8 g cm^–3, respectively.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Deduce the relation for the magnetic field at a point due to an infinitely long straight conductor carrying current using Biot-Savart law.
2)
Compute the torque experienced by a magnetic needle in a uniform magnetic field.
3)
Obtain the magnetic field at a point on the equatorial line of a bar magnet.
4)
Discuss the working of cyclotron in detail.
5)
Explain the principle and working of a moving coil galvanometer.

12th Standard English Medium Physics Subject Electrostatics Book Back 3 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Calculate the number of electrons in one coulomb of negative charge.
2)
Consider two point charges q₁ and q₂ at rest as shown in the figure.

They are separated by a distance of 1m. Calculate the force experienced by the two charges for the following cases:
(a) q₁ = +2μC and q₂ = +3μC
(b) q₁ = +2μC and q₂ = -3μC
(c) q₁= +2μC and q₂ = -3μC kept in water (ε_r = 80)
3)
Two small-sized identical equally charged spheres, each having mass 1 g are hanging in equilibrium as shown in the figure. The length of each string is 10 cm and the angle θ is 30° with the vertical. Calculate the magnitude of the charge in each sphere. (Take g = 10 ms⁻²)
4)
Calculate the electrostatic force and gravitational force between the proton and the electron in a hydrogen atom. They are separated by a distance of 5.3 x 10^–11 m. The magnitude of charges on the electron and proton are 1.6 x 10^–19 C. Mass of the electron is m_e = 9.1 x 10^–31 kg and mass of proton is m_p = 1.6 x 10^–27 kg.
5)
Consider four equal charges q₁, q₂, q₃ and q₄ = q = +1 μC located at four different points on a circle of radius 1m, as shown in the figure. Calculate the total force acting on the charge q₁ due to all the other charges.

12th Standard English Medium Physics Subject Electrostatics Book Back 3 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Obtain an expression for potential energy due to a collection of three point charges which are separated by finite distances.
2)
Obtain Gauss law from Coulomb’s law.
3)
Obtain the expression for electric field due to an charged infinite plane sheet.
4)
Discuss the various properties of conductors in electrostatic equilibrium.
5)
Explain dielectrics in detail and how an electric field is induced inside a dielectric.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What do you mean by Internet of Things?
2)
Distinguish between intrinsic and extrinsic semiconductors.
3)
How electron-hole pairs are created in a semiconductor material?
4)
What do you mean by leakage current in a diode?
5)
Distinguish between avalanche breakdown and Zener breakdown.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Discuss the biasing polarities in an NPN and PNP transistors
2)
What is the phase relationship between the AC input and output voltages in a common emitter amplifier? What is the reason for the phase reversal?
3)
Give circuit symbol, logical operation, truth table, and Boolean expression of
i) AND gate
ii) OR gate
iii) NOT gate
iv) NAND gate
v) NOR gate and
vi) EX-OR gate.
4)
Define bandwidth of transmission system.
5)
What is mobile communication?

12th Standard English Medium Physics Subject Wave Optics Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What are the salient features of corpuscular theory of light?
2)
What is interference of light?
3)
Obtain the relation between phase difference and path difference.
4)
How does wavefront division provide coherent sources?
5)
What is bandwidth of interference pattern?

12th Standard English Medium Physics Subject Wave Optics Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Mention the differences between interference and diffraction.
2)
What is polarisation?
3)
Discuss polarisation by selective absorption.
4)
What are plane polarised, unpolarized and partially polarised light?
5)
List the uses of polaroids.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Distinguish between Nanoscience and Nanotechnology.
2)
What is the difference between Nano materials and Bulk materials?
3)
Give any two examples for “Nano” in nature.
4)
Why steel is preferred in making Robots?
5)
What are sub atomic particles?

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
What is the difference between Nano materials and Bulk materials?
2)
Mention any two advantages and disadvantages of Robotics.
3)
Why steel is preferred in making Robots?
4)
What are black holes?
5)
What are sub atomic particles?

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What is isobar? Give an example.
2)
Show that nuclear density is almost constant for nuclei with Z > 10.
3)
What is binding energy of a nucleus? Give its expression.
4)
Give the physical meaning of binding energy per nucleon.
5)
Give the symbolic representation of alpha decay, beta decay and gamma decay.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Define the ionization energy and ionization potential.
2)
What is distance of closest approach?
3)
Write a general notation of nucleus of element X. What does each term denote?
4)
What is isotone? Give an example.
5)
Define atomic mass unit u.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
How will you define threshold frequency?
2)
State de Broglie hypothesis.
3)
A proton and an electron have same kinetic energy. Which one has greater de Broglie wavelength. Justify.
4)
Name an experiment that shows the wave nature of the electron. Which phenomenon was observed in this experiment using an electron beam?
5)
A deuteron and an alpha particle are accelerated with the same potential. Which one of the two has i) greater value of de Broglie wavelength associated with it and ii) less kinetic energy? Explain.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Why do metals have a large number of free electrons?
2)
What is photoelectric effect?
3)
Give the definition of intensity of light according to quantum concept and its unit.
4)
What is a photo cell? Mention the different types of photocells.
5)
Why we do not see the wave properties of a baseball?

12th Standard English Medium Physics Subject Ray Optics Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
How does an endoscope work?
2)
What are the sign conventions followed for lenses?
3)
Obtain the equation for lateral magnification of thin lens.
4)
Derive the equation for effective focal length for lenses in contact.
5)
What is dispersion?

12th Standard English Medium Physics Subject Ray Optics Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
What are resolution and resolving power?
2)
Discuss about simple microscope and obtain the equations for magnification for near point focusing and normal focusing.
3)
Why are dish antennas curved?
4)
It is possible for two lenses to produce zero power?
5)
Why is yellow light preferred to during fog?

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
What is displacement current?
2)
What are electromagnetic waves?
3)
Write down the integral form of modified Ampere’s circuital law.
4)
Explain the concept of intensity of electromagnetic waves.
5)
What is meant by Fraunhofer lines?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What is meant by electromagnetic induction?
2)
State Lenz’s law.
3)
How is Eddy current produced? How do they flow in a conductor?
4)
What for an inductor is used? Give some examples.
5)
What is meant by mutual induction?

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
What are step-up and step-down transformers?
2)
How will you define RMS value of an alternating current?
3)
Define electric resonance.
4)
How will you define Q-factor?
5)
Give any one definition of power factor.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What is meant by magnetic induction?
2)
Define magnetic dipole moment.
3)
What is magnetic susceptibility?
4)
What is magnetic permeability?
5)
Compare dia, para and ferro-magnetism.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Define magnetic dipole moment.
2)
What is magnetic susceptibility?
3)
What is magnetic permeability?
4)
Compare dia, para and ferro-magnetism.
5)
Define ampere.

12th Standard English Medium Physics Subject Current Electricity Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Why current is a scalar?
2)
State microscopic form of Ohm’s law.
3)
What are ohmic and non ohmic devices?
4)
Define temperature coefficient of resistance.
5)
What is electric power and electric energy?

12th Standard English Medium Physics Subject Current Electricity Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Distinguish between drift velocity and mobility.
2)
State macroscopic form of Ohm’s law.
3)
Define electrical resistivity.
4)
Write a short note on superconductors?
5)
Define current density.

12th Standard English Medium Physics Subject Electrostatics Book Back 2 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
What are the properties of an equipotential surface?
2)
Define ‘electrostatic potential energy’.
3)
What is meant by electrostatic energy density?
4)
What is polarisation?
5)
Define ‘capacitance’. Give its unit.

12th Standard English Medium Physics Subject Electrostatics Book Back 2 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
What is meant by quantisation of charges?
2)
What are the differences between Coulomb force and gravitational force?
3)
Define ‘electric field’
4)
The electric field lines never intersect. Justify.
5)
Write the general definition of electric dipole moment for a collection of point charge.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
If the input to the NOT gate is A = 1011, its output is ______.
2)
Which one of the following represents forward bias diode?
3)
The output of the following circuit is 1 when the input ABC is______.
4)
The signal is aff ected by noise in a communication system _____________.
5)
The internationally accepted frequency deviation for the purpose of FM broadcasts ____________.

12th Standard English Medium Physics Subject Electronics and Communication Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
The barrier potential of a silicon diode is approximately, ______.
2)
A forward biased diode is treated as ________________.
3)
The zener diode is primarily used as ______.
4)
The light emitted in an LED is due to ______.
5)
The specific characteristic of a common emitter amplifier is _______________.

12th Standard English Medium Physics Subject Wave Optics Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to, _____.
2)
When light is incident on a soap film of thickness 5 x 10^–5 cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be, _____.
3)
First diffraction minimum due to a single slit of width 1.0 x 10^–5 cm is at 30^o. Then wavelength of light used is,_____.
4)
A ray of light strikes a glass plate at an angle 60^o. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is, _____.
5)
Light transmitted by Nicol prism is, _____.

12th Standard English Medium Physics Subject Wave Optics Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is _____.
2)
Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are _____.
3)
First diffraction minimum due to a single slit of width 1.0 x 10^–5 cm is at 30^o. Then wavelength of light used is,_____.
4)
One of the of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,_____.
5)
The transverse nature of light is shown in,

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
The particle size of ZnO material is 30 nm. Based on the dimension it is classified as _____.
2)
The blue print for making ultra durable synthetic material is mimicked from _____.
3)
“Sky wax” is an application of nano product in the field of _____.
4)
The alloys used for muscle wires in Robots are _____.
5)
The particle which gives mass to protons and neutrons are _____.

12th Standard English Medium Physics Subject Recent Developments in Physics Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Which one of the following is the natural nanomaterial.
2)
The method of making nanomaterial by assembling the atoms is called _____.
3)
The materials used in Robotics are _____.
4)
The technology used for stopping the brain from processing pain is _____.
5)
The gravitational waves were theoretically proposed by _____.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
In J.J. Thomson e/m experiment, electrons are accelerated through 2.6 kV enter the region of crossed electric field and magnetic field of strength 3.0 x 10⁴ Vm^-1 and 1.0 x 10^-3 T, respectively, and pass through it and undeflected, then the specific charge is _____.
2)
The electric potential of an electron is given by \(V={ V }_{ 0 } \ In\left( \frac { r }{ { r }_{ 0 } } \right) \), where r₀ is a constant. If Bohr atom model is valid, then variation of radius of n^th orbit r_n with the principal quantum number n is _____.
3)
The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as _____.
4)
M_p denotes the mass of the proton and M_n denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by _____.(where c is the speed of light)
5)
The half-life period of a radioactive element A is same as the mean life time of another radioactive element B. Initially both have the same number of atoms. Then _____.

12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus of atomic number Z, then the distance of closest approach of alpha particle to the nucleus is _____.
2)
Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is _____.
3)
The charge of cathode rays particle is _____.
4)
The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li⁺⁺, He⁺and H is _____.
5)
If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate nuclear radius of ⁶⁴Cu, in femi is _____.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be _____.
2)
A light source of wavelength 520 nm emits 1.04 x 10¹⁵photons per second while the second source of 460 nm produces 1.38 x 10¹⁵ photons per second. Then the ratio of power of second source to that of first source is _____.
3)
The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.
4)
Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is _____.
5)
Emission of electrons by the absorption of heat energy is called ______ emission.

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would _____.
2)
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is _____.
3)
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and λ /2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the material is _____.
4)
Two radiations with photon energies 0.9 eV and 3.3 eV respectively are falling on a metallic surface successively. If the work function of the metal is 0.6 eV, then the ratio of maximum speeds of emitted electrons in the two cases will be _____.
5)
If the mean wavelength of light from sun is taken as 550 nm and its mean power as 3.8 x 10²⁶W, then the number of photons emitted per second from the sun is of the order of _____.

12th Standard English Medium Physics Subject Ray Optics Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is, ______.
2)
For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is, ______.
3)
Stars twinkle due to, ______.
4)
The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be, ______.
5)
A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45^o . The ray can undergo total internal reflection for the following n, ______.

12th Standard English Medium Physics Subject Ray Optics Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
The speed of light in an isotropic medium depends on, ______.
2)
An object is placed in front of a convex mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.
3)
If the velocity and wavelength of light in air is V_a and λ_a and that in water is V_w and λ_w, then the refractive index of water is______.
4)
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as plane sheet of glass. This implies that the liquid must have refractive index, ______.
5)
An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is ______.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
In an electromagnetic wave traveling in free space the rms value of the electric field is 3 V m⁻¹. The peak value of the magnetic field is _____.
2)
If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?
3)
Which of the following is an electromagnetic wave?
4)
If E = E_o sin[10⁶ x -ωt] be the electric field of a plane electromagnetic wave, the value of ω is_____.
5)
The electric and magnetic fields of an electromagnetic wave are _____.

12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
If the amplitude of the magnetic field is 3 x 10⁻⁶ T, then amplitude of the electric field for a electromagnetic waves is _____.
2)
Which of the following is false for electromagnetic waves
3)
The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.
4)
During the propagation of electromagnetic waves in a medium __________________.
5)
A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
A circular coil with a cross-sectional area of 4 cm² has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm². The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
2)
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
3)
In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between the voltage and current in the circuit is
4)
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series across a source of emf V = 10 sin 340 t. The power loss in AC circuit is
5)
In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

12th Standard English Medium Physics Subject Electromagnetic Induction and Alternating Current Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?
2)
The flux linked with a coil at any instant t is given by \(\Phi\)_B = 10t²− 50t + 250. The induced emf at t = 3s is
3)
The current i flowing in a coil varies with time as shown in the figure. The variation of induced emf with time would be
4)
In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is
5)
In an electrical circuit, R, L, C, and AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and current in the circuit is \(\frac{\pi}{3}\). Instead, if C is removed from the circuit, the phase difference is again \(\frac{\pi}{3}\). The power factor of the circuit is

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Two identical coils, each with N turns and radius R are placed coaxially at a distance R as shown in the figure. If I is the current passing through the loops in the same direction, then the magnetic field at a point P at a distance of R/2 from the centre of each coil is _____.
2)
A bar magnet of length l and magnetic moment p_m is bent in the form of an arc as shown in Figure. The new magnetic dipole moment will be
3)
The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is _____.
4)
The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?
5)
A simple pendulum with charged bob is oscillating with time period T and lets θ be the angular displacement. If the uniform magnetic field switched ON in a direction perpendicular to the plane of oscillation then ___________.

12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
An electron moves in a straight line inside a charged parallel plate capacitor of uniform charge density σ. The time taken by the electron to cross the parallel plate capacitor undeflected when the plates of the capacitor are kept under constant magnetic field of induction \((\vec{B})\) is
2)
A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly ____.
3)
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
4)
A wire of length l carrying a current I along the Y direction is kept in a magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is _____.
5)
A non-conducting charged ring carrying a charge of q, mass m and radius r is rotated about its axis with constant angular speed ω. Find the ratio of its magnetic moment with angular momentum is _____.

12th Standard English Medium Physics Subject Current Electricity Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose R_A = 3 R_B, then what is the ratio of radius of wire A to that of B?
2)
In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be ______.
3)
There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?
4)
The temperature coefficient of resistance of a wire is 0.00125 per °C. At 20°C, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at ______.
5)
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ______.

12th Standard English Medium Physics Subject Current Electricity Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
The following graph shows current versus voltage values of some unknown conductor. What is the resistance of this conductor?
2)
A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.
3)
What is the value of resistance of the following resistor?
4)
A wire connected to a power supply of 230 V has power dissipation P₁. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P₂. The ratio \(\frac{P_2}{P_1}\) is ______.
5)
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW are connected. The voltage of electric mains is 220 V. The maximum capacity of the main fuse of the building will be ______.

12th Standard English Medium Physics Subject Electrostatics Book Back 1 Mark Questions with Solution Part - II - by Question Bank Software - May 31, 2021 - View & Read

1)
Which charge configuration produces a uniform electric field?
2)
An electric dipole is placed at an alignment angle of 30^o with an electric field of 2 x 10⁵ NC^-1. It experiences a torque equal to 8 N m. The charge on the dipole if the dipole length is 1 cm is
3)
The total electric flux for the following closed surface which is kept inside water
4)
Rank the electrostatic potential energies for the given system of charges in increasing order
5)
A thin conducting spherical shell of radius R has a charge Q which is uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is _____.

12th Standard English Medium Physics Subject Electrostatics Book Back 1 Mark Questions with Solution Part - I - by Question Bank Software - May 31, 2021 - View & Read

1)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
2)
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = V_o – V_A, where V_o is the potential at the origin and V_A is the potential at x = 2 m is _____.
3)
Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.
4)
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
5)
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 \(\times\) 10^-2 C and 5 \(\times\) 10^-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

Stateboard 12th Standard Physics Subject English Medium Public Answer Key - March 2020 - by QB Admin - May 19, 2021 - View & Read

Stateboard 12th Standard Physics Subject English Medium Public Answer Key - March 2019 - by QB Admin - May 19, 2021 - View & Read

Stateboard 12th Standard Physics Subject Public Question Paper - March 2020 - by QB Admin - May 19, 2021 - View & Read

Stateboard 12th Standard Physics Subject Public Question Paper - March 2019 - by QB Admin - May 19, 2021 - View & Read

12th Standard Physics Reduced Syllabus 2020-21 - by QB Admin - Apr 23, 2021 - View & Read

12th Standard Physics English Medium Electrostatics Important Questions - by Question Bank Software - Apr 23, 2021 - View & Read

1)
Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?
2)
Two identical conducting balls having positive charges q₁ and q₂ are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
3)
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = V_o – V_A, where V_o is the potential at the origin and V_A is the potential at x = 2 m is _____.
4)
Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is
5)
The electrostatic force obeys _______.

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