How does a semiconductor behave at absolute zero?

a) Conductor

b) Insulator

c) Semiconductor

d) Protection device

2. Semiconductor acts as an insulator in the presence of impurities.

a) True

b) False

3. How is the resistance of semiconductor classified?

a) High resistance

b) Positive temperature co-efficient

c) Negative temperature co-efficient

d) Low resistance

4. What are the charge carriers in semiconductors?

a) Electrons and holes

b) Electrons

c) Holes

d) Charges

5. Which of the following is known as indirect band gap semiconductors?

a) Germanium

b) Nickel

c) Platinum

d) Carbon

6. Which column elements are combined to make compound semiconductors?

a) First and fourth

b) Fifth and sixth

c) Second and fourth

d) Third and fifth

7. Compound semiconductors are also known as direct band gap semiconductors.

a) True

b) False

8. How are charge carriers produced in intrinsic semiconductors?

a) By pure atoms

b) By electrons

c) By impure atoms

d) By holes

9. What type of material is obtained when an intrinsic semiconductor is doped with pentavalent impurity?

a) N-type semiconductor

b) Extrinsic semiconductor

c) P-type semiconductor

d) Insulator

10. What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?

a) Extrinsic semiconductor

b) Insulator

c) N-type semiconductor

d) P-type semiconductor