Solid State Physics MCQs Question and Answer in Engineering Physics

41

The dielectric constant of a material at optical frequencies is mainly due to

A) ionic polarizability B) electronic polarizability C) dipolar polarizability D) ionic and dipolar polarizabilities

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Answer & Solution

Answer: Option A

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42

The temperature (T) dependence of magnetic susceptibility $$\left( \chi \right)$$ of a ferromagnetic substance with Curie temperature (T_c) is given by

A) $$\frac{C}{{T - {T_C}}}$$ , T < T_c B) $$\frac{C}{{T - {T_C}}}$$ , T > T_c C) $$\frac{C}{{T + {T_C}}}$$ , T > T_c D) $$\frac{C}{{T + {T_C}}}$$ , for all temperatures.

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Answer & Solution

Answer: Option B

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43

Metallic monovalent sodium crystallizes in body centred cubic structure. If the length of the unit cell is 4 × 10^-8 cm, the concentration of conduction electrons in metallic sodium is

A) 6.022 × 10²³ cm^-3 B) 3.125 × 10²² cm^-3 C) 2.562 × 10²¹ cm^-3 D) 1.250 × 10²⁰ cm^-3

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Answer: Option B

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44

In an experiment involving a ferromagnetic medium, the following observations were made. Which one of the plots does not correctly represent the property of the medium?

A)

B)

C)

D)

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Answer & Solution

Answer: Option D

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45

For a three-dimensional crystal having N primitive unit cells with a basis of p atoms, the number of optical branches is

A) 3 B) 3p C) 3p - 3 D) 3N - 3p

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Answer & Solution

Answer: Option C

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46

Which one of the following statements is not correct about the Brillouin Zones (BZ) of a square lattices with constant a?

A) The first BZ is a square of side 2π/a in k_x - k_y plane B) The areas of the first BZ and third BZ are the same C) The k-points are equidistant in k_x as well as in k_y directions D) The area of the second BZ is twice that of the first BZ

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Answer & Solution

Answer: Option D

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47

The kinetic energy of a free electron at a corner of the first Brillouin zone of a two-dimensional square lattice is larger than that of an electron at the mid-point of a side of the zone by a factor b. The value of b is

A) √2 B) 2 C) 4 D) 8

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Answer & Solution

Answer: Option C

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48

The distance between the adjacent atomic planes in CaCO₃ is 0.3 nm. The smallest angle of Bragg scattering for 0.03 nm X-ray is

A) 2.9° B) 1.5° C) 0.29° D) 5.8°

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Answer & Solution

Answer: Option A

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49

Which one of the following statements about superconductors is not true?

A) A type I superconductor is completely diamagnetic B) A type II superconductor exhibits Meissner effect upto the second critical magnetic field (H_c₂) C) A type II superconductor exhibits zero resistance upto the second critical magnetic field D) Both type I and type II superconductors exhibit sharp fall in resistance at the superconducting transition temperature

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Answer: Option B

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50

Variation of electrical resistivity $$\rho $$ with temperature T of three solids is sketched (on different scales) in the figure, as curves P, Q and R.
Which one of the following statements describes the variations most appropriately?
Solid State Physics mcq question image

A) P is for a superconductor and R for a semiconductor B) Q is for a superconductor and P for a conductor C) Q is for a superconductor and R for a conductor D) R is for a superconductor and P for a conductor

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Answer & Solution

Answer: Option B

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