Conductors and Non-Conductors NDA Questions

NDA Physics

Conductors and Non-Conductors MCQ Questions


7.
In a semiconductor, the mobility of electrons is
A.
Higher than that of holes.
B.
Lower than that of holes.
C.
Equal to that of holes.
D.
None of the above.
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ANSWER :
A. Higher than that of holes.
8.
Which of the following is an indirect method of charging?
A.
Charging by induction
B.
Charging by physical contact
C.
Charging by friction
D.
None of these
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ANSWER :
A. Charging by induction
9.
When the distance between two charges is reduced to half, the force between them
A.
Remains the same
B.
Doubles
C.
Quadruples
D.
Halves
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ANSWER :
C. Quadruples
10.
Which among the following is a semiconductor material?
A.
Copper
B.
Silicon
C.
Gold
D.
Iron
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ANSWER :
B. Silicon
11.
Which of the following materials is used in integrated circuits?
A.
Copper
B.
Silicon
C.
Gold
D.
Iron
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ANSWER :
B. Silicon
12.
Which of the following materials has low electrical conductivity?
A.
Graphite
B.
Gold
C.
Silver
D.
Silicon
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ANSWER :
D. Silicon