In tuning radio we use,

(a)

capacitors

(b)

transistors

(c)

diodes

(d)

LEDS

Two short bar magnets have magnetic moments 1.20 Am² and 1.00 Am² respectively. They are kept on a horizontal table parallel to each other with their north poles pointing towards south. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid-point O of the line joining their centres is (Horizontal components of Earth’s magnetic induction is 3.6 × 10^–5 Wb m^–2 )

(a)

3.60 × 10^-5 Wb m^-2

(b)

3.5 × 10^-5 Wb m^-2

(c)

2.56 × 10^-4 Wb m^-2

(d)

2.2 × 10^-4 Wb m^-2

The electrical series circuit in digital form is

(a)

AND

(b)

OR

(c)

NOR

(d)

NAND

A current gain for, a transistor working as CB amplifier is 0.90. If emitter current is 10 mA, then base current is ________________.

(a)

1mA

(b)

2 mA

(c)

0.1 mA

(d)

0.2 mA

Digital circuits can be made to be respective use of ______________.

(a)

AND gate

(b)

OR gate

(c)

NOT gate

(d)

NAND gate

In an N-P-N transistor circuit, the emitter, collector, and base current are respectively I_E, I_C, and l_B. The relation between them is _____________.

(a)

I_C EB

(b)

I_B CE

(c)

I_B > I_C > I_E

(d)

I_B > I_C > I_E

Which of the following figure represents an ideal diode characteristics?

(a)

(b)

(c)

(d)

For Boolean identities match the pair
(i) \(\overset { = }{ A } \) (P) Ā + \(\bar { B } \)
(ii) \(\overline { A+B } \) (Q) A.B
(iii) \(\overline { A.B } \) (R) \(\bar { A } .\bar { B } \)
(iv) A.(Ā + B) (S) A

(a)

1 - (S), 2 (P), 3 - (Q), 4 - (R)

(b)

1 - (S), 2 (R), 3 - (Q), 4 - (P)

(c)

1 - (S), 2 (Q), 3 - (P), 4 - (R)

(d)

1- (S), 2 (R), 3 - (P), 4 - (Q)

For a transistor amplifier, the voltage gain ______________.

(a)

remain constant for all frequencies

(b)

is high at high and low frequencies and constant in the mid - frequency range

(c)

is low at high and low frequencies and constant in the mid-frequency range

(d)

None of the above

The cause of potential barrier in a p-n diode is ________________.

(a)

depletion of negative charges near the junction

(b)

concentration of positive charges near the junction

(c)

depletion of positive charges near the junction

(d)

concentration of positive and negative charges near the junction

In a p-n junction diode _________________.

(a)

the current in the reverse biased condition is generally very small

(b)

the current in the reverse biased condition is small but the forward biased current is independent of the biased voltage

(c)

the reverse biased current is strongly dependent on the applied bias voltage.

(d)

the forward biased current is very small in comparison to reverse biased current

Diffusion of free electrons across the junction of an unbiased diode produces _____________.

(a)

forward bias

(b)

reverse bias

(c)

depletion layer

(d)

break down

In order to draw a transfer characteristics of transistors ________ is kept constant.

(a)

V_CE

(b)

I_B

(c)

I_C

(d)

V_BE

Digital signals are converted into analog signals using ________.

(a)

FAX

(b)

Modem

(c)

Cable

(d)

Coaxial Cable

ln NPN transistors, when the emitter-base junction is forward-biased, the direction of conventional current is from _____________

(a)

base to emitter

(b)

emitter to base

(c)

collector to base 

(d)

base to collector

State the laws of reflection

Write thekey components of robot.

A diode is called as a unidirectional device. Explain.

Explain the need for a feedback circuit in a transistor oscillator.

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.

State De Morgan's first and second theorems

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.

Obtain an expression for potential energy due to a collection of three point charges which are separated by finite distances.

Give and explain the mechanical analogy of LC oscillations by qualitative treatment.

List out the laws of photo electric effect.

A silicon diode is connected with 1kΩ resistor as shown. Find the value of current flowing through AB is

What is electronics?

Write the analogies between electrical and mechanical quantities

Prove the laws of reflection using Huygen's principle.

In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.

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.