Conductors and Non-Conductors NDA Questions

NDA Physics

Conductors and Non-Conductors MCQ Questions


1.
Which of the following is a good conductor of electricity?
A.
Wood
B.
Copper
C.
Glass
D.
Rubber
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ANSWER :
B. Copper
2.
The main difference between conductors and insulators is
A.
Conductors have free electrons; insulators do not.
B.
Insulators have free electrons; conductors do not.
C.
Conductors have more neutrons; insulators have more protons.
D.
Insulators have more neutrons; conductors have more protons.
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ANSWER :
A. Conductors have free electrons; insulators do not.
3.
In a good conductor, the energy gap between the conduction band and the valence band is
A.
Infinite
B.
Wide
C.
Narrow
D.
Zero
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ANSWER :
D. Zero
4.
Which material is an example of an insulator?
A.
Silver
B.
Aluminum
C.
Rubber
D.
Gold
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ANSWER :
C. Rubber
5.
The resistivity of a conductor increases with
A.
Decrease in temperature
B.
Increase in temperature
C.
Increase in pressure
D.
Decrease in pressure
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ANSWER :
B. Increase in temperature
6.
The property of a semiconductor is
A.
It has an almost empty conduction band and an almost filled valence band.
B.
It has a completely filled conduction band.
C.
It has no valence band.
D.
It is a perfect insulator at absolute zero.
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ANSWER :
A. It has an almost empty conduction band and an almost filled valence band.