Exercise: Materials And Components

Questions for: Materials And Components

The number of valence electrons in silicon atom is
A:
4
B:
2
C:
1
D:
zero
Answer: A
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Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ∈r. The capacitance per metre length is
A:
B:
C:
D:
Answer: B
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Assertion (A): Ionic solids, in general, have no electrical conductivity.

Reason (R): In ionic solids, electrons are tightly bound to the nucleus.

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

If electrons are tightly bound, conductivity is not there.

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A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be
A:
negligible
B:
low
C:
high
D:
very high
Answer: D

The dielectric of a good capacitor should have very high resistivity.

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If B, H and M denote flux density, field intensity and magnetisation, B = μ0 (H + M).
A:
True
B:
False
C:
D:
Answer: A
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