# Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 23 - 27 of 82

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## Question 23

Thermodynamics and Statistical Physics

Appeared in Year: 2013

### Question

MCQ▾

Consider a gas of atoms obeying Maxwell – Boltzmann statistics. The average value of over all the momenta of each of the particles (where is a constant vector and is its magnitude, is the mass of each atom, T is temperature and is Boltzmann՚s constant) is –

### Choices

Choice (4)Response

a.

b.

One

c.

d.

Zero

## Question 24

Thermodynamics and Statistical Physics

Appeared in Year: 2013

### Question

MCQ▾

If Planck՚s constant were zero, then the total energy contained in a box filled with radiation of all frequencies at temperature would be –

( is Boltzmann constant and is nonzero)

### Choices

Choice (4)Response

a.

Zero

b.

c.

d.

Infinite

## Question 25

Thermodynamics and Statistical Physics

Appeared in Year: 2011

### Question

MCQ▾

In a first order phase transition, at the transition temperature, specific heat of the system,

### Choices

Choice (4)Response

a.

Remains unchanged and its entropy has finite discontinuity

b.

Has finite discontinuity and its entropy diverges.

c.

Diverges and its entropy has finite discontinuity

d.

Diverges and its entropy remains the same

### Passage

There are four energy levels (where ) . The canonical partition function of two particles is, if these particles are:

## Question 26 (1 of 2 Based on Passage)

Thermodynamics and Statistical Physics

Appeared in Year: 2013

### Question

MCQ▾

Two distinguishable particles –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 27 (2 of 2 Based on Passage)

Thermodynamics and Statistical Physics

Appeared in Year: 2013

### Question

MCQ▾

Two identical fermions –

### Choices

Choice (4)Response

a.

b.

c.

d.

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