Exercise: Materials And Components

Questions for: Materials And Components

Which of these has lowest dielectric strength?
A:
Dry air
B:
Wet air
C:
Cotton
D:
Paper
Answer: B

Cotton and paper have higher dielectric strength than air. Moisture decreases dielectric strength.

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The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)
A:
0.40
B:
0.16
C:
0.04
D:
0.01
Answer: D
No answer description is available. Let's discuss.
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The quantum numbers associated with electron motion are designed as
A:
a, b, c
B:
h, k, l
C:
n, m, l
D:
h, n, l
Answer: C
No answer description is available. Let's discuss.
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In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is
A:
0
B:
0.25
C:
0.5
D:
1
Answer: C
No answer description is available. Let's discuss.
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The temperature at which some materials become superconductors is called
A:
Transition temperature
B:
Curie temperature
C:
Neel temperature
D:
Onnes temperature
Answer: A
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