Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Zener diode acts as a/an:

A p-type semiconductor is:

In an AC circuit containing only capacitance, the current:

A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be

(a) (i) 0.04 m from the flat face; (ii) 0.025 m from the flat face

(b) (i) At the same position of the cross mark; (ii) 0.025 m below the flat face

(c) (i) 0.025 m from the flat face; (ii) 0.04 m from the flat face

(d) For both (i) and (ii) 0.025 m from the highest point of the hemisphere

The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

(a) h/mv

(b) mv/h

(c) mh/v

(d) m/hv

The reactance of a circuit is zero. It is possible that the circuit contains.

Which atom contains exactly 15 neutrons?

Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be

(a) Twice of the second	(b) Half of the second
(c) Equal to the second	(d) Four times of the second

For a solid with a small expansion coefficient:

1. C_p - C_v = R
2. C_p = C_v
3. C_p is slightly greater than C_v
4. C_p is slightly less than C_v

When a semiconductor is heated, its resistance

(a) Decreases

(b) Increases

(c) Remains unchanged

(d) Nothing is definite