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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 3
46.

Assertion (A): An electron having charge - e and mass m and lying in an electric field E is subjected to an acceleration - (e/m) E.

Reason (R): If there are n electrons/m3 moving with velocity vx and each electron has a charge - e, the current density J = - n evx.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
When a pentavalent impurity is added, the semiconductor becomes
p type
n type
intrinsic
neutral
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
n A
(n - 1) A
(n + 1) A
Answer: Option
Explanation:

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

50.
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?
1 and 3 only
2 and 3 only
1 and 4 only
2 and 4 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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