Exercise: Materials And Components

Questions for: Materials And Components

In an intrinsic semiconductor, at a given temperature T
A:
the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
B:
the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
C:
the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
D:
any of the above
Answer: A
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A rare gas having N atoms/m3 is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.
A:
True
B:
False
C:
D:
Answer: A
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The mass of proton and electron are
A:
1.672 x 10-26 kg and 9.107 x 10-31 kg respectively
B:
9.107 x 10-26 kg and 9.107 x 10-31 kg respectively
C:
9.107 x 10-29 kg and 9.107 x 10-31 kg respectively
D:
9.107 x 10-30 kg and 9.107 x 10-31 kg respectively
Answer: A
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Yettrium-iron garnet (Y2Fe5O12) is a soft magnetic material suitable for applications involving
A:
dc
B:
50 Hz ac
C:
ac of a few K Hz
D:
ac of a few hundred MHz
Answer: A

Yettrium iron garnet has very low eddy current loss. Hence it is used at frequencies in MHz range.

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Ferrimagnetic materials have anti-parallel orientation of equal moments of permanent dipoles.
A:
True
B:
False
C:
D:
Answer: A
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