Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 4 - 6 of 56

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Question number: 4

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2014

MCQ▾

Question

The pressure P of a fluid is related to its number density ρ by the equation of state P=aρ+bρ2; where a and b are constants. If the initial volume of the fluid is V0, the work done on the system when it is compressed so as to increase the number density from an initial value of ρ0 to 2ρ0 is – (December)

Choices

Choice (4) Response

a.

(3a2+7ρ0b3)ρ0V0

b.

2ρ0V0

c.

(aln2+bρ0)ρ0V0

d.

(a+bρ0)ρ0V0

Question number: 5

» Thermodynamic and Statistical Physics » Phase Equilibria

Appeared in Year: 2013

MCQ▾

Question

The entropy S of a thermodynamic system as a function of energy E is given by the following graph,

Entropy as a function of energy

Entropy as a Function of Energy

In figure the entropy S of a thermodynamic system as a function of energy E is shown.

The temperature of the phases A, B and C denoted by TA,TB and TC , respectively, satisfy the following inequalities – (December)

Choices

Choice (4) Response

a.

TC>TB>TA

b.

TA>TC>TB

c.

TB>TC>TA

d.

TB>TA>TC

Question number: 6

» Thermodynamic and Statistical Physics » Planck's Distribution Law

Appeared in Year: 2013

MCQ▾

Question

The speed v of the molecules of mass m of an ideal gas obeys Maxwell’s velocity distribution law at an equilibrium temperature T. Let (vx,vy,vz) denote the components of the velocity and kB the Boltzmann constant. The average value of (αvxβvy)2, where α and β are constant, is – (December)

Choices

Choice (4) Response

a.

(αβ)2kBTm

b.

(α2β2)kBTm

c.

(α2+β2)kBTm

d.

(α+β)2kBTm

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