Electromagnetic Waves — Physics STD 12 Science — Question

One plate of parallel plate capacitor is smaller than other, then charge on smaller plate will be(a) Less than other(b) More than other(c) Equal to other(d) Will depend upon the medium between them

Three semi-conductors are arranged in the increasing order of their energy gap as follows. The correct  arrangement is(a) Tellurium, germanium, silicon(b) Tellurium, silicon, germanium(c) Silicon, germanium, tellurium(d) Silicon, tellurium, germanium

In a semiconductor:

1. There are no free electrons at 0K.
2. There are no free electrons at any temperature.
3. The number of free electrons increases with temperature.
4. The number of free electrons is less than that in a conductor.

In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:

A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self inductance of coil is(a) 5 H(b) 10 H(c) 11 H(d) 12 H

The relationship between potential difference V, charge Q and capacitance C is:

In the previous question, the smallest kinetic energy at the bottom of the incline will be achieved by:

1. The solid sphere.
2. The hollow sphere.
3. The disc.
4. All will achieve same kinetic energy.

The electric field intensity produced by the radiations coming from 100W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50W bulb at the same distance is:

The thermocouple is based on the principle of(a) Seebeck effect(b) Thomson effect(c) Peltier effect(d) Joule effect