CSIR Physical Sciences: Questions 98 - 101 of 389

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Question number: 98

» Electromagnetic Theory » Gauge Invariance

Appeared in Year: 2013

MCQ▾

Question

Let (V, A) and (V’, A’) denote two sets of scalar and vector potentials, and ψ a scalar function. Which of the following transformations level the electric and magnetic field (and hence Maxwell’s equations) unchanged? (December)

Choices

Choice (4) Response

a.

A=A2ψandV=Vψt

b.

A=AψandV=V+2ψt

c.

A=A+ψandV=Vψt

d.

A=A+ψandV=V+ψt

Question number: 99

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

Question

Consider the melting transition of ice into water at constant pressure. Which of the following thermodynamic quantities does not exhibit a discontinuous change across the phase transition? (December)

Choices

Choice (4) Response

a.

Internal energy

b.

Entropy

c.

Helmholtz free energy

d.

Gibbs free energy

Question number: 100

» Thermodynamic and Statistical Physics » Micro- and Macro-States

Appeared in Year: 2012

MCQ▾

Question

The number of ways in which N identical bosons can be distributed in two energy levels, is – (June)

Choices

Choice (4) Response

a.

N(N1)2

b.

N(N+1)2

c.

N+1

d.

N

Question number: 101

» Classical Mechanics » Periodic Motion » Small Oscillations

Appeared in Year: 2012

MCQ▾

Question

A solid cylinder of height H, radius R and density ρ , floats vertically on the surface of a liquid of density ρ0 . The cylinder will be set into oscillatory motion when a small instantaneous downward force is applied. The frequency of oscillation is – (December)

Choices

Choice (4) Response

a.

ρ0gρH

b.

ρρ0gH

c.

ρgρ0H

d.

ρgρ0H

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