Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): For most metals, Fermi energy EF is less than 10 eV.

Reason (R): Fermi level of a metal is given by EF = 3.64 x 10-19 (n)2/3 where n is number of free electrons/m3 of metal.

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
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Assertion (A): The resistance of a copper specimen changes by about 22% when temperature is increased from room temperature to 700°C.

Reason (R): The physical properties of a material are determined mostly by the extent of impurities.

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

The increase of resistance with temperature is governed by temperature coefficient of resistance.

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The class of insulation of impregnated paper is
A:
A
B:
B
C:
C
D:
F
Answer: A
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The electric dipole moment of a neutral system of point charges Q1, Q2.... is Qiri . The charges Qi
A:
must be all positive
B:
must be all negative
C:
must be such that Qi = 0
D:
either (a) or (b)
Answer: C

The system is neutral and hence sum is zero.

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Nichrome is used for
A:
overhead line wires
B:
heater coils
C:
lamp filaments
D:
all of the above
Answer: B
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