# Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 77 - 81 of 82

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## Question 77

Thermodynamics and Statistical Physics

Appeared in Year: 2006

### Question

MCQ▾

A monatomic crystalline solid comprises of atoms, out of which atoms are in interstitial positions. If the available interstitial sites are , then number of possible microstates –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 78

Thermodynamics and Statistical Physics

Appeared in Year: 2006

### Question

MCQ▾

In hydrogenic states, the probability of finding an electron at is –

### Choices

Choice (4)Response

a.

zero in state

b.

non – zero in state

c.

zero in state

d.

zero in state

## Question 79

Thermodynamics and Statistical Physics

Appeared in Year: 2006

### Question

MCQ▾

For the given transformations

and

;

where and are canonically conjugate variable, which one of the following statement is true?

### Choices

Choice (4)Response

a.

(i) and (ii) are canonical

b.

Only (ii) is canonical

c.

Neither (i) and (ii) is canonical

d.

Only (i) is canonical

## Question 80

Thermodynamics and Statistical Physics

Appeared in Year: 2017

### Question

MCQ▾

Consider non – interacting, distinguishable particles in a two level system at temperature . The energies of the levels are and , where . In the high temperature limit , what is the population of particle in the level with energy ?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 81

Thermodynamics and Statistical Physics

Appeared in Year: 2017

### Question

MCQ▾

A reversible Carnot engine is operated between temperature and with a photon gas as the working substance. The efficiency of the engine is:

### Choices

Choice (4)Response

a.

b.

c.

d.

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