Exercise: Materials And Components

Questions for: Materials And Components

For iron, the ferromagnetic Curie temperature is
A:
about 20 K
B:
about 100°C
C:
about -20°C
D:
about 1000 K
Answer: D
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Assertion (A): Both sodium and ferrous are ferromagnetic.

Reason (R): Both sodium and ferrous have body centred cubic structure.

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
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A photoconductor is a
A:
conductor
B:
semiconductor
C:
insulator
D:
superconductor
Answer: B
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The amount of time between the creation and recombination of a free electron and hole is called
A:
relaxation time
B:
life time
C:
lorentz time
D:
collision time
Answer: B
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As per Curie-Weiss law, the magnetic susceptibility of a material varies as
A:
T-2
B:
C:
T
D:
T2
Answer: B
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