Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

If the energy of the photon is increased by a factor of 4, then its momentum

(a) Does not change	(b) Decreases by a factor of 4
(c) Increases by a factor of 4	(d) Decreases by a factor of 2

The current in the given circuit is

(a) 0.1 A

(b) 0.2 A

(c) 0.3 A

(d) 0.4 A

A thin convex lens of focal length 10 cm is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be

(a) Zero

(b) Infinity

(c) 10 cm

(d) 20 cm

On passing 96500 coulomb of charge through a solution  the amount of copper liberated is

(a) 64 gm

(b) 32 gm

(c) 32 kg

(d) 64 kg

If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it is

(a) 4

(b) 3

(c)

(d) 3 m/s

A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth's magnetic field, the electron beam will be deflected

1. Towards the proton beam.
2. Away from the proton beam.
3. Upwards.
4. Downwards.

Which of the following is an atom donor impurity?

The impurity atom added to germanium to make it N-type semiconductor is

(a) Arsenic

(b) Iridium

(c) Aluminium

(d) Iodine

Statement-I : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion and

Statement-II: For heavy nuclei, binding energy per nucleon increases with increasing Z. while for light nuclei it decreases with increasing Z.

For the diode, the characteristic curves are given at different temperature. The relation between the temperatures is

(a)

(b)

(c)

(d) None of the above