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GATE-PH SERIES
Physics

General Physics

24 previous year questions.

Volume: 24 Ques
Yield: High

High-Yield Trend

24
2023

Chapter Questions
24 MCQs

01
PYQ 2023
medium
physics ID: gate-ph-
Consider 6 identical, non-interacting, spin atoms arranged on a crystal lattice at absolute temperature . The z-component of the magnetic moment of each of these atoms can be . If and are the probabilities of the net magnetic moment of the solid being and respectively, what is the value of (in integer)?
1
15
2
10
3
20
4
25
02
PYQ 2023
medium
physics ID: gate-ph-

Two independent electrostatic configurations are shown in the figure. Configuration (I) consists of an isolated point charge , and configuration (II) consists of another identical charge surrounded by a thick conducting shell of inner radius and outer radius , with the charge being at the center of the shell. where and are the magnitudes of the electric fields for configurations (I) and (II) respectively, is the permittivity of vacuum, and the volume integrations are carried out over all space. If what is the value of the integer ?

03
PYQ 2023
medium
physics ID: gate-ph-

In a hadronic interaction, 's are produced with different momenta, and they immediately decay into two photons with an opening angle between them. Assuming that all these decays occur in one plane, which one of the following figures depicts the behaviour of as a function of the momentum ?

1

A

2

B

3

C

4

D

04
PYQ 2023
medium
physics ID: gate-ph-
In the first Brillouin zone of a rectangular lattice (lattice constants \AA\ and \AA), three incoming phonons with the same wave vector \AA \AA interact to give one phonon. Which one of the following is the CORRECT wave vector of the resulting phonon?
1
\AA \AA
2
\AA \AA
3
\AA \AA
4
\AA \AA
05
PYQ 2023
medium
physics ID: gate-ph-
A neutron beam with a wave vector and an energy 20.4 meV diffracts from a crystal with an outgoing wave vector . One of the diffraction peaks is observed for the reciprocal lattice vector of magnitude \AA . What is the diffraction angle in degrees (rounded off to the nearest integer) that makes with the plane? (Use mass of neutron = Kg)
1
15
2
30
3
45
4
60
06
PYQ 2023
medium
physics ID: gate-ph-

A rod of proper length lies along the -axis and moves towards the positive -direction with speed with respect to the ground (see figure), where is the speed of light in vacuum. An observer on the ground measures the positions of and at different times and respectively in the ground frame, and finds the difference between them to be . What is the value of ?

1

2

3

4

07
PYQ 2023
medium
physics ID: gate-ph-
A particle of mass is free to move on a frictionless horizontal two-dimensional plane, and is acted upon by a force with being a positive constant. If and are the generalized momenta corresponding to and respectively, then what is the value of ?
1

2

3

4

08
PYQ 2023
medium
physics ID: gate-ph-

Which one of the following options is the most appropriate match between the items given in Column 1 and Column 2?

1
(i) - T; (ii) - P,S,T; (iii) - Q,R; (iv) - S
2
(i) - P,T; (ii) - S; (iii) - R,S; (iv) - S,T
3
(i) - T; (ii) - R,S; (iii) - Q,R; (iv) - S
4
(i) - S,T; (ii) - P,S; (iii) - R,T; (iv) - S
09
PYQ 2023
medium
physics ID: gate-ph-
Consider an isolated magnetized sphere of radius with a uniform magnetization along the positive direction, with the north and south poles of the sphere lying on the axis. It is given that the magnetic field inside the sphere is , where is the permeability of vacuum. Which of the following statements is(are) CORRECT?
1
The bound volume current density is zero
2
The bound surface current density has maximum magnitude at the equator, where this magnitude equals
3
The auxiliary field
4
Far from the sphere, the magnetic field is due to a dipole of moment , where
10
PYQ 2023
medium
physics ID: gate-ph-
A matrix has the property and , where is the identity matrix. Which one of the following is the CORRECT set of eigenvalues of the matrix ?
1
(1, 1, -1, -1)
2
(i, i, -i, -i)
3
(i, i, i, -i)
4
(1, 1, -i, -i)
11
PYQ 2023
medium
physics ID: gate-ph-

Which one of the following options is CORRECT for the given logic circuit?

1
P = 1, Q = 1; X = 0
2
P = 1, Q = 0; X = 1
3
P = 0, Q = 1; X = 0
4
P = 0, Q = 0; X = 1
12
PYQ 2023
medium
physics ID: gate-ph-

The figure schematically shows the M (magnetization) - H (magnetic field) plots for certain types of materials. Here M and H are plotted in the same scale and units. Which one of the following is the most appropriate combination?

1
(Q) - Paramagnet; (R) - Type-I Superconductor; (S) - Antiferromagnet
2
(P) - Paramagnet; (Q) - Diamagnet; (R) - Type-I Superconductor
3
(P) - Paramagnet; (Q) - Antiferromagnet; (R) - Type-I Superconductor
4
(P) - Diamagnet; (Q) - Paramagnet; (R) - Type-I Superconductor
13
PYQ 2023
medium
physics ID: gate-ph-

The Hall experiment is carried out with a non-magnetic semiconductor. The current is along the X-axis and the magnetic field is along the Z-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?

1
vs. (constant value)
2
vs. (linear increase)
3
vs. (quadratic curve)
4
vs. (step function)
14
PYQ 2023
medium
physics ID: gate-ph-
Choose the most appropriate matching of the items in Column 1 with those in Column 2.
1
(i) - Q; (ii) - S; (iii) - P; (iv) - R
2
(i) - R; (ii) - Q; (iii) - P; (iv) - S
3
(i) - R; (ii) - S; (iii) - P; (iv) - Q
4
(i) - P; (ii) - Q; (iii) - R; (iv) - S
15
PYQ 2023
medium
physics ID: gate-ph-
In pion nucleon scattering, the pion and nucleon can combine to form a short-lived bound state called the particle ( ). The masses of the pion, nucleon, and the particle are 140 MeV/ , 938 MeV/ , and 1230 MeV/ , respectively. In the lab frame, where the nucleon is at rest, what is the minimum energy (in MeV/ , rounded off to one decimal place) of the pion to produce the particle?
1

2

3

4

16
PYQ 2023
medium
physics ID: gate-ph-
Consider the vector field consisting of the velocities of points on a thin horizontal disc of radius , moving anticlockwise with uniform angular speed about an axis passing through its center. If , then which of the following options is/are CORRECT? (In the options, and are unit vectors corresponding to the plane polar coordinates and ). \includegraphics[width=0.75\linewidth]{image57.png}
1

2

3
, where is a unit vector perpendicular to the plane
4

17
PYQ 2023
medium
physics ID: gate-ph-
A slow moving particle is captured by a deuteron ( ) and this reaction produces two neutrons ( ) in the final state, i.e., .
Neutron and deuteron have even intrinsic parities, whereas has odd intrinsic parity. and are the orbital and spin angular momenta, respectively of the system of two neutrons. Which of the following statements regarding the final two-neutron state is/are CORRECT?
1
It has odd parity
2
is odd
3
,
4
,
18
PYQ 2023
medium
physics ID: gate-ph-
Consider the complex function At , which of the following options is(are) CORRECT?
1
The order of the pole is 4
2
The order of the pole is 3
3
The residue at the pole is
4
The residue at the pole is
19
PYQ 2023
medium
physics ID: gate-ph-
Consider two real functions where is a real constant and are real coefficients. If is analytic, then what is the value of ?
1

2

3

4

20
PYQ 2023
medium
physics ID: gate-ph-
For a transistor amplifier, the frequency response is such that the mid band voltage gain is 200. The cutoff frequencies are 20 Hz and 20 kHz. What is the ratio (rounded off to two decimal places) of the voltage gain at 10 Hz to that at 100 kHz?
21
PYQ 2023
medium
physics ID: gate-ph-
Which of the following options represent(s) linearly independent pair(s) of functions of a real variable ?
1
and
2
and
3
and
4
and
22
PYQ 2023
medium
physics ID: gate-ph-
The Geiger-Muller counter is a device to detect , , and radiations. It is a cylindrical tube filled with monatomic gases like argon, and polyatomic gases such as ethyl alcohol. The inner electrode is along the axis of the cylindrical tube and the outer electrode is the tube. Which of the following statements is/are CORRECT?
1
Argon is used so that ambient light coming from the surroundings do not produce any signal in the detector
2
Ethyl alcohol is used as a quenching gas
3
The electric field strength decreases from the axis to the edge of the tube and the direction of the field is radially outward
4
The electric field increases from the axis to the edge of the tube and the field direction is radially inward
23
PYQ 2023
medium
physics ID: gate-ph-
Which one of the following is a dimensionless constant?
1
Permittivity of free space
2
Permeability of free space
3
Bohr magneton
4
Fine structure constant
24
PYQ 2023
medium
physics ID: gate-ph-
The atomic number of an atom is 6. What is the spectroscopic notation of its ground state, according to Hund’s rules?
1

2

3

4