CSIR Physical Sciences: Questions 217 - 220 of 389

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Question number: 217

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

Question

If the energy dispersion of a two – dimensional electron system is E=uk , where u is the velocity and k is the momentum, then the density of states D(E) depends on the energy as, (June)

Choices

Choice (4) Response
a.

E

b.

Constant

c.

1E

d.

E

Question number: 218

» Electromagnetic Theory » Scalar and Vector Potentials

Appeared in Year: 2013

MCQ▾

Question

The components of a vector potential Aμ(A0,A1,A2,A3) are given by,

Aμ=k(xyz,yzt,zxt,xyt) Where k is constant. The three components of the electric field are – (June – 2013)

Choices

Choice (4) Response
a.

k(yz,zx,xy)

b.

(0, 0,0)

c.

k(x,y,z)

d.

k(xt,yt,zt)

Question number: 219

» Quantum Mechanics » Spin-Statistics Connection

Appeared in Year: 2013

MCQ▾

Question

Consider three particles A, B and C each with an attribute S that can take two values ±1. Let SA=1,SB=1 and SC=1 at a given instant. In the next instant, each S value can change to S with probability 13 . The probability that SA+SB+SC remains unchanged is – (June – 2013)

Choices

Choice (4) Response
a.

29

b.

23

c.

49

d.

13

Question number: 220

» Classical Mechanics » Conservation Laws and Cyclic Coordinates

Appeared in Year: 2012

MCQ▾

Question

A planet of mass m moves in the gravitational field of the Sun (mass M). If the semi – major and semi – minor axes of the orbit are a and b respectively, the angular momentum of the planet is – (December)

Choices

Choice (4) Response
a.

2GMm2(a+b)

b.

2GMm2(ab)

c.

2GMm2aba+b

d.

2GMm2abab

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