Question

Assertion  :   Silicon is preferred over germanium for making semiconductor devices.

Reason      : The energy gap for germanium is more than the energy gap of silicon.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(c) If assertion is true but reason is false.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is

(a) Normal to the face through which it emerges

(b) Inclined at 30° to the face through which it emerges

(c) Inclined at 60° to the face through which it emerges

(d) None of these

If a drop of water is introduced between the glass plate and a convex lens in a Newton's ring system, the ring system:

A parallel plate capacitor consists of two circular plates each of radius 12cm and separated by 5.0mm. The capacitor is being charged by an external source. The charging current is constant and is equal to 0.15A.The displacement current is:

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV

(a) 28

(b) 7

(c) 4  

(d) 1

A conducting rod of length L is falling with velocity V in a uniform horizontal magnetic field B normal to the rod. The induced emf between the ends the rod will be:
Displacement current is continuous:
When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary.
  1. The surface tension of the liquid must be zero.
  2. The contact angle must be 90º.
  3. The surface tension may be zero.
  4. The contact angle may be 90°.

A circular coil of diameter 7cm has 24 turns of wire carrying current of 0.75A. The magnetic moment of the coil is

(a) 6.9  

(b) 2.3  

(c)  

(d)  

There are two equipotential surface as shown in figure. The distance between them is r. The charge of –q coulomb is taken from the surface A to B, the resultant work done will be

(a)  

(b)

(c)

(d)

The contribution in the total current flowing through a semiconductor due to electrons and holes are   and   respectively. If the drift velocity of electrons is   times that of holes at this temperature, then the ratio of concentration of electrons and holes is

(a) 6 : 5

(b) 5 : 6

(c) 3 : 2

(d) 2 : 3