Thermodynamic and Statistical Physics-Free Energy (CSIR Physical Sciences): Questions 1 - 3 of 9

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Question number: 1

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

Question

Consider the melting transition of ice into water at constant pressure. Which of the following thermodynamic quantities does not exhibit a discontinuous change across the phase transition? (December)

Choices

Choice (4) Response

a.

Internal energy

b.

Entropy

c.

Helmholtz free energy

d.

Gibbs free energy

Question number: 2

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2014

MCQ▾

Question

The free energy F of a system depends on a thermodynamic variable ψ as F=aψ2+bψ6 with a,b>0 . The value of ψ , when the system is in thermodynamic equilibrium, is – (June)

Choices

Choice (4) Response

a.

±(a6b)14

b.

±(a3b)14

c.

±(ab)14

d.

Zero

Question number: 3

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

Question

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

1T(1)=3RN(1)2U(1)

and1T(2)=5RN(2)2U(2)

Where T(1, 2),N(1,2) and U(1, 2) are respectively the temperatures, the mole numbers and the internal energies of the two systems, and R is the gas constant. Let Utot denote the total energy when these two systems are put in contact and attain thermal equilibrium. The ratio U(1)Utot is – (December)

Choices

Choice (4) Response

a.

N(2)N(1)+N(2)

b.

5N(2)3N(1)+5N(2)

c.

N(1)N(1)+N(2)

d.

3N(1)3N(1)+5N(2)

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