1. Which of the following materials is a good conductor of electricity?
A. Glass
B. Copper
C. Wood
D. Rubber
Answer: B. Copper
2. What is the primary characteristic of an insulator?
A. It has free electrons.
B. It does not allow the flow of electric current.
C. It has a high density of charge carriers.
D. It is magnetic in nature.
Answer: B. It does not allow the flow of electric current.
3. Semiconductors are characterized by their:
A. High conductivity
B. Low conductivity
C. Intermediate conductivity
D. No conductivity
Answer: C. Intermediate conductivity
4. Which of the following is a semiconductor material?
A. Silicon
B. Copper
C. Glass
D. Rubber
Answer: A. Silicon
5. In semiconductors, the energy gap (band gap) is typically:
A. 0 eV
B. Very large
C. Very small
D. Moderate
Answer: D. Moderate
6. What happens to the conductivity of a semiconductor with increasing temperature?
A. It increases.
B. It decreases.
C. It remains constant.
D. It becomes zero.
Answer: A. It increases.
7. Which of the following is an example of an insulator?
A. Iron
B. Silicon
C. Rubber
D. Aluminum
Answer: C. Rubber
8. The valence band and conduction band in a conductor:
A. Are far apart.
B. Overlap.
C. Are separated by a wide gap.
D. Do not exist.
Answer: B. Overlap
9. Which of these is a property of conductors?
A. High resistance
B. Low resistance
C. Non-magnetic
D. Brittle
Answer: B. Low resistance
10. A material with a band gap of 1.1 eV is likely to be a:
A. Conductor
B. Semiconductor
C. Insulator
D. Superconductor
Answer: B. Semiconductor