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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 1
46.
If a piece of wood is placed in a magnetic field
the magnetic field will not be affected
the magnetic lines of force will bend towards the piece
the magnetic lines of force will bend away from the piece
the flux may increase or decrease
Answer: Option
Explanation:

Wood is non-magnetic.

47.
The apparent capacitance at a high angular frequency ω of an air cored capacitor having capacitance C and inductance L is given by
Answer: Option
Explanation:

The combination can be represented as L and C in series.

.

Therefore, .

48.
The number of valence electrons in donor impurity are
5
4
3
1
Answer: Option
Explanation:

Donor impurity has 5 valence electrons (while silicon has 4 valence electrons).

Hence donor impurity can donate electrons.

49.
In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.
True
False
Answer: Option
Explanation:

Sharing of valence electons is a characteristic of true valence crystal.

50.
Which of the following are donor impurities?
  1. Gold
  2. Phosphorus
  3. Boron
  4. Antimony
  5. Arsenic
  6. Induim
Select the correct answer using the following codes
1, 2, 3
1, 2, 4, 6
3, 4, 5, 6
2, 4, 5
Answer: Option
Explanation:

Donor impurities have five valence electrons.

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