GATE PH Solid State Physics PYQs & Answers — Page 2

Questions 11–20 of 65. Imported answers require independent review unless marked reviewed.

Consider a monatomic chain of length 30 cm. The phonon density of states is

s. Assuming the Debye model, the velocity of sound in m/s (rounded off to one decimal place) is _____

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following option(s) is/are correct for a Type I superconductor?

Your answerSelect all correct options. You can choose more than one.

The phase transition to the normal state in the absence of a magnetic field is of second order

With increase in temperature, the critical magnetic field decreases linearly to zero

Below the critical temperature, the entropy in the superconducting state is less than that in the normal state

The phase transition to the normal state in the presence of a magnetic field is of first order

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Crystal structures of two metals A and B are two-dimensional square lattices with same lattice constant

. Electrons in metals behave as free electrons. The Fermi surfaces corresponding to A and B are shown by solid circles in figures.

The electron concentrations in A and B are

and

, respectively. The value of

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The temperature dependence of the electrical conductivity (

) of three intrinsic semiconductors A, B and C is shown in figure.

Let

and

be the bandgaps of A, B and C, respectively. Which one of the following relations is correct?

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The X-ray diffraction pattern of a monatomic cubic crystal with rigid spherical atoms of radius 1.56 Å shows several Bragg reflections of which the reflection appearing at the lowest

value is from (111) plane. If the wavelength of X-ray used is 0.78 Å, the Bragg angle (in

, rounded off to one decimal place) corresponding to this reflection and the crystal structure, respectively, are

Your answerChoose one option.

and body centered cubic

and face centered cubic

and body centered cubic

and face centered cubic

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The temperature T dependence of magnetic susceptibility

(Column I) of certain magnetic materials (Column II) are given below.

Which of the following option is/are correct?

Column I: (1)

decreases from a maximum as

increases; (2)

decreases with increasing

; (3)

is constant; (4)

decreases from a large value as

increases.

Column II: (P) Diamagnetic; (Q) Paramagnetic; (R) Ferromagnetic; (S) Antiferromagnetic.

Your answerSelect all correct options. You can choose more than one.

2 – P, 4 – Q, 3 – S

4 – P, 1 – Q, 2 – R

4 – Q, 2 – R, 1 – S

3 – P, 4 – Q, 2 – R

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Apart from the acoustic modes, 9 optical modes are identified from the measurements of phonon dispersions of a solid with chemical formula

, where

and

denote the atomic species, and

and

are integers. Which of the following combination of n and m is/are possible?

Your answerSelect all correct options. You can choose more than one.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A material behaves as a superconductor below a critical temperature

and as a normal conductor above

. A magnetic field

is applied when

. The material is then cooled below

in the presence of

. Which of the following figure represent the correct configuration of magnetic field lines?

Your answerSelect all correct options. You can choose more than one.

Diagram for Physics question 57 (figure 2)

Diagram for Physics question 57 (figure 3)

Diagram for Physics question 57 (figure 4)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The Hall experiment is carried out with a non-magnetic semiconductor. The current

is along the

-axis and the magnetic field

is along the

-axis. Which one of the following is the CORRECT representation of the variation of the magnitude of the Hall resistivity

as a function of the magnetic field?

Your answerChoose one option.

Diagram for Physics question 16 (figure 2)

Diagram for Physics question 16 (figure 3)

Diagram for Physics question 16 (figure 4)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A compound consists of three ions X, Y and Z. The Z ions are arranged in an FCC arrangement. The X ions occupy

of the tetrahedral voids and the Y ions occupy

of the octahedral voids. Which one of the following is the CORRECT chemical formula of the compound?

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE PH Solid State Physics PYQs

Question 34

Question 47

Question 16

Question 27

Question 39

Question 52

Question 54

Question 57

Question 16

Question 18