# Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 15 - 18 of 64

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## Question number: 15

» Thermodynamic and Statistical Physics » Planck's Distribution Law

Appeared in Year: 2014

MCQ▾

### Question

A system can have three energy levels: . The level is doubly degenerate, while the others are non-degenerate. The average energy at inverse temperature is – (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 16

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

### Question

Two different thermodynamic system are described by the following equations of state –

Where and are respectively the temperatures, the mole numbers and the internal energies of the two systems, and R is the gas constant. Let denote the total energy when these two systems are put in contact and attain thermal equilibrium. The ratio is – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 17

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2014

MCQ▾

### Question

For a particular thermodynamic system the entropy S is related to the internal energy U and volume V by ; where c is a constant. The Gibbs potential for this system is – (June)

### Choices

Choice (4) Response

a.

b.

c.

Zero

d.

## Question number: 18

» Thermodynamic and Statistical Physics » Planck's Distribution Law

MCQ▾

### Question

In low density oxygen gas at low temperature, only the translational and rotational modes of the molecules are excited. The specific heat per molecule of the gas is – (December)

### Choices

Choice (4) Response

a.

b.

c.

d.

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