Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 23 - 26 of 56

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Question number: 23

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

If the number density of a free electron gas in three electron gas in three dimensions is increase eight times, its Fermi temperature will –

(December)

Choices

Choice (4) Response

a.

Increase by a factor of 4

b.

Decrease by a factor of 8

c.

Increase by a factor of 8

d.

Decrease by a factor of 4

Question number: 24

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2011

MCQ▾

Question

The internal energy E of a system is given by E=bS3VN , where b is a constant and other symbols have their usual meaning. The temperature of this system is equal to – (December)

Choices

Choice (4) Response

a.

3bS2VN

b.

bS3V3N

c.

bS2VN

d.

(SN)2

Question number: 25

» Thermodynamic and Statistical Physics » Phase Equilibria

Appeared in Year: 2011

MCQ▾

Question

A particle is confined to the region x0 by a potential which increases linearly as u(x)=u0x . The mean position of the particle at temperature T is – (June)

Choices

Choice (4) Response

a.

u0kBT

b.

kBTu0

c.

(kBT)2u0

d.

kBTu0

Question number: 26

» Thermodynamic and Statistical Physics » Random Walk

Appeared in Year: 2014

MCQ▾

Question

A random walker takes a step of unit length in the positive direction with probability 23 and a step of unit length in the negative direction with probability 13 . The mean displacement of the walker after n steps is – (December)

Choices

Choice (4) Response

a.

0

b.

n8

c.

n3

d.

2n3

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