Exercise: Materials And Components

Questions for: Materials And Components

If WF is the Fermi level, then in a metal at T = 0
A:
all energy levels above WF filled, all those below WF are empty
B:
all energy levels below WF are filled, all those above WF are empty
C:
some energy levels, both below and above WF, are filled
D:
all energy levels below and above WF are filled
Answer: B
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Assertion (A): The angular momentum of an atom is due to three contributions viz. orbital, electron spin and nuclear spin.

Reason (R): The nuclear spin magnetic moment is much more than electron spin magnetic moment.

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

Nuclear spin is of the same order as electron sum.

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Spontaneous magnetisation is characteristic of ferromagnetic materials.
A:
True
B:
False
C:
D:
Answer: A
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A dielectric material must be
A:
insulator
B:
good conductor
C:
resistor
D:
semiconductor
Answer: A

Any material other than insulator will short-circuit the plates.

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Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
A:
Debye temperature
B:
Curie temperature
C:
Neel temperature
D:
Transition temperature
Answer: A
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