Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): Electronic and Ionic polarization in a polyatomic gas are independent of temperature.

Reason (R): The orientation polarization is independent of temperature.

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: C

Orientation polarization is inversely proportional to temperature.

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The minority carrier life time and diffusion constant in a semiconducting material are 100 Ξs and 100 cm2/s respectively. The diffusion length of carriers is
A:
0.1 cm
B:
0.01 cm
C:
0.0141 cm
D:
1 cm
Answer: A

Diffusion length = sqrt(Carrier life time x Diffusion constant) = (100 x 10-6 x 100)0.5 = 0.1 cm.

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The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be
A:
32 mH
B:
16 mH
C:
8 mH
D:
4 mH
Answer: D

Inductance is inversely proportional to the core length.

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The conductivity of intrinsic semiconductor is given by
A:
eni(Ξp - Ξn)
B:
eni(Ξp + Ξn)
C:
ni(Ξp + Ξn)
D:
ni(ΞpΞn)
Answer: B

For intrinsic semiconductor,

Conductivity = (Electron charge) x (Number of charge carriers) x (Sum of mobilities of holes and electrons).

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Assertion (A): Atomic number of sodium is 11.

Reason (R): Sodium has a body centred cubic lattice.

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: B

Atomic number is not dependent on lattice structure.

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