The intensity of electric field at a point is

(a)

the force experienced by a charge q

(b)

the work done in bringing unit positive charge from infinity to that point

(c)

the positive gradient of the potential

(d)

the negative gradient of the potential

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 ______________.

(a)

1.67 V

(b)

0.67 V

(c)

2.67 V

(d)

3.67 V

A current carrying conductor is associated with  _______________.

(a)

electric field

(b)

magnetic field

(c)

electro magnetic

(d)

all these

Which of the following cannot be stepped up in a transformer?

(a)

input current

(b)

input voltage

(c)

input power

(d)

all

The electric and magnetic field of an EM wave are _____________.

(a)

in phase and perpendicular to each other

(b)

in phase and parallel to each other

(c)

in opposite phase and perpendicular to each other

(d)

in opposite phase and parallel to each other

The light reflected by plane mirror may form a real images ____________.

(a)

If the rays incident on the mirror are diverging

(b)

If the rays incident on the mirror are converging

(c)

If the object is placed very close to mirror

(d)

Under no circumstance

The ionization energy of hydrogen atom is -13.6e V. The energy corresponding to a transition between 3rd and 4th orbit is ______________.

(a)

3.40 eV

(b)

1.51 eV

(c)

0.85 eV

(d)

0.66 eV

Rydberg's constant, R = ?

(a)

\(\frac { m{ e }^{ 2 }e }{ 8{ Z }^{ 2 }{ h }^{ 3 } } \)

(b)

\(\frac { { Ze }^{ 2 }me }{ 8{ \pi }^{ 2 }h } \)

(c)

\(\frac { { me }^{ 4 } }{ 8{ { \epsilon }_{ 0 } }^{ 2 }c{ h }^{ 3 } } \)

(d)

\(\frac { me }{ 8{ \epsilon }_{ 0 }ch } \)

In AM receiver, if 900 kHz station is tuned, then the local oscillator will have to produce a frequency of ______________.

(a)

600 kHz

(b)

455 kHz

(c)

10.7 MHz

(d)

1355 kHz

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