Exercise: Materials And Components

Questions for: Materials And Components

At a very low temperature, a semiconductor
A:
becomes a conductor
B:
becomes an insulator
C:
may become a conductor or an insulator
D:
will remain a semiconductor becomes a conductor or an insulator
Answer: B

Semi conductor becomes insulator at very low temperature.

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If q is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is
A:
0.5 qωR
B:
0.5 q2ω2R2
C:
0.5 qωR2
D:
0.5 qω2R
Answer: C
No answer description is available. Let's discuss.
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The number of valence electrons in acceptor impurity are
A:
5
B:
4
C:
3
D:
1
Answer: C
No answer description is available. Let's discuss.
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The heat developed per m3 per second (W) in a conductor having a conductivity σ and a field E is
A:
W = σE2
B:
W = σE
C:
W =
D:
W = (σE)0.5
Answer: A
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Assertion (A): Copper is a monoatomic solid.

Reason (R): In a metal the valence electrons belong to all atoms.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: B
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