Which gates are represented by this figure 

(1) NAND gate

(2) AND gate

(3) NOT gate

(4) OR gate

The valency of the impurity atom that is to be added to germanium crystal so as to make it an N-type semiconductor, is
1. 6

2. 5

3. 4

4. 3

Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity 

(1) Decreases

(2) Increases

(3) Remains unchanged

(4) Becomes zero

The valence of an impurity added to germanium crystal in order to convert it into a P-type semiconductor is

(1) 6

(2) 5

(3) 4

(4) 3

A P-type semiconductor can be obtained by adding

(1) Arsenic to pure silicon

(2) Gallium to pure silicon

(3) Antimony to pure germanium

(4) Phosphorous to pure germanium

Bonding is a germanium crystal (semi-conductor) is

(1) Metallic

(2) Ionic

(3) Vander Waal's type

(4) Covalent

In a crystal, the atoms are located at the position of

(1) Maximum potential energy

(2) Minimum potential energy

(3) Zero potential energy

(4) Infinite potential energy

The distance between the body centered atom and a corner atom in sodium (a = 4.225 Å) is 

(1) 3.66 Å

(2) 3.17 Å

(3) 2.99 Å

(4) 2.54 Å

In good conductors of electricity, the type of bonding that exists is 

(1) Ionic

(2) Vander Waals

(3) Covalent

(4) Metallic