Exercise: Materials And Components

Questions for: Materials And Components

In carbon resistor colour code, if the third band is of silver, it indicates
A:
that three zeros are to be added to indicate the resistance value
B:
multiplier is 0.01
C:
multiplier is 0.1
D:
tolerance is ± 5%
Answer: B
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Even at room temperature, an intrinsic semiconductor has some holes. These holes are due to
A:
electron
B:
doping
C:
thermal energy
D:
free electrons
Answer: C
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A material has N spins per m3. If Np are the dipoles per m3 parallel to field and Na are the dipoles per m3 anti-parallel to field, the magnetisation is
A:
B:
C:
D:
Answer: A
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The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that
A:
hf = |W1 - W2|
B:
|W1 - W2|f = h
C:
hf = 0.5|W1 - W2|
D:
(hf)2 = |W1 - W2|
Answer: A
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The capacitance of an insulated conducting sphere of radius R in vacuum is
A:
2p∈0R
B:
4p∈0R
C:
4p∈0R2
D:
4p
Answer: B
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