Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): Diamond and carborudum are both very hard materials.

Reason (R): Valence band can be extremely strong.

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: A

Valence bond results in hardness.

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The orientation polarization is
  1. directly proportional to temperature
  2. inversely proportional to temperature
  3. inversely proportional to square of permanent dipole moment
  4. directly proportional to square of permanent dipole moment.
Which of the above are correct?
A:
1 and 3 only
B:
2 and 3 only
C:
1 and 4 only
D:
2 and 4 only
Answer: D
No answer description is available. Let's discuss.
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For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
A:
n A
B:
(n - 1) A
C:
(n + 1) A
D:
Answer: B

If the number of plates is n, the number of capacitors is (n - 1).

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In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.
A:
True
B:
False
C:
D:
Answer: A
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When a pentavalent impurity is added, the semiconductor becomes
A:
p type
B:
n type
C:
intrinsic
D:
neutral
Answer: B
No answer description is available. Let's discuss.
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