Exercise: Materials And Components

Questions for: Materials And Components

When the atom of rare gas is placed in an electric field the nucleus shifts from the centre of electron cloud by an amount x. If the radius of electron cloud is R, then
A:
x << R
B:
x 0.5 R
C:
x ≅ 0.75 R
D:
x ≅ R
Answer: A
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Assertion (A): In an intrinsic semiconductor J = (μn x μp)eni.

Reason (R): Intrinsic charge concentration ni at temperature T is given by ni2 = A0 T3 e-EG0/kT.

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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When a dielectric is subjected to an electric field E, each volume element of dielectric can be considered to be carrying an electric dipole moment.
A:
True
B:
False
C:
D:
Answer: A
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Assertion (A): Copper is a good conductor of electricity.

Reason (R): Copper has a face 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

Conductivity does not depend on lattice structure.

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The core of an atom consists of
A:
nucleus
B:
nucleus and all orbits
C:
nucleus and inner orbits
D:
none of the above
Answer: C
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