GATE PH topic:physics PYQs & Answers — Page 42

Questions 411–420 of 650. Imported answers require independent review unless marked reviewed.

Choose the correct statement related to the Fermi energy (

) and the chemical potential (

) of a metal.

Your answerChoose one option.

only at 0 K

at finite temperature

at 0 K

at finite temperature

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

Consider a diatomic molecule formed by identical atoms. If

and

represent the energy of the vibrational nuclear motion and electronic motion respectively, then in terms of the electronic mass

and nuclear mass

is proportional to

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

Which one of the following relations determines the manner in which the electric field lines are refracted across the interface between two dielectric media having dielectric constants

and

(see figure)?

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

and

are the electric and magnetic fields respectively, then

Your answerChoose one option.

odd under parity and even under time reversal

even under parity and odd under time reversal

odd under parity and odd under time reversal

even under parity and even under time reversal

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

A small disc is suspended by a fiber such that it is free to rotate about the fiber axis (see figure). For small angular deflections, the Hamiltonian for the disc is given by

where

is the moment of inertia and

is the restoring torque per unit deflection. The disc is subjected to angular deflections (

) due to thermal collisions from the surrounding gas at temperature

and

is the momentum conjugate to

. The average and the root-mean-square angular deflection,

and

, respectively are

Your answerChoose one option.

and

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

As shown in the figure, an ideal gas is confined to chamber A of an insulated container, with vacuum in chamber B. When the plug in the wall separating the chambers A and B is removed, the gas fills both the chambers. Which one of the following statements is true?

Your answerChoose one option.

The temperature of the gas remains unchanged

Internal energy of the gas decreases

Temperature of the gas decreases as it expands to fill the space in chamber B

Internal energy of the gas increases as its atoms have more space to move around

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

Particle

with angular momentum

decays into two particles

and

with angular momenta

and

, respectively. If

, the value of

is _____.

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

Far from the Earth, the Earth’s magnetic field can be approximated as due to a bar magnet of magnetic pole strength

. Assume this magnetic field is generated by a current carrying loop encircling the magnetic equator. The current required to do so is about

, where

is an integer. The value of

is _____. (Earth’s circumference:

)

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

The number of distinct ways the primitive unit cell can be constructed for the two dimensional lattice as shown in the figure is _____.

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

A hydrogen atom is subjected to a strong magnetic field. In the absence of spin-orbit coupling, the number of doubly degenerate states created out of the

-level is _____.

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

GATE PH topic:physics PYQs

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20