CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 154 - 157 of 463

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Question number: 154

» Thermodynamic and Statistical Physics » Classical and Quantum Statistics

Appeared in Year: 2014

MCQ▾

Question

Let ; where and are independent and identically distributed Gaussian random variables of mean and standard deviation . Then is – (June)

Choices

Choice (4) Response

a.

1

b.

c.

d.

Question number: 155

» Thermodynamic and Statistical Physics » Introduction to Nonequilibrium Processes

Appeared in Year: 2014

MCQ▾

Question

When a gas expands adiabatically from volume and by a quasi – static reversible process, it cools from temperature to . If now the same process is carried out adiabatically and irreversibly, and is the temperature of the gas when it has equilibrated, then – (December)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 156

» Electromagnetic Theory » Electromagnetic Waves in Free Space

Appeared in Year: 2011

MCQ▾

Question

A plane electromagnetic wave is propagating in a lossless dielectric. The electric field is given by , where c is the speed of light in vacuum, , A and are constant and and are unit vectors along the x and z – axes. The relative dielectric constant of the medium, and the constant A are – (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 157

» 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

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