CSIR Physical Sciences: Questions 152 - 155 of 401

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Question number: 152

» Classical Mechanics » Special Theory of Relativity » Mass-Energy Equivalence

Appeared in Year: 2011

MCQ▾

Question

Given that the ground state energy of the hydrogen atom is 13.6eV , the ground state energy of positronium (which is a bound state of an electron and a positronium) is – (December)

Choices

Choice (4) Response

a.

13.6eV

b.

27.2eV

c.

+6.8eV

d.

6.8eV

Question number: 153

» Mathematical Methods of Physics » Binomial, Poisson and Normal Distributions

Appeared in Year: 2014

MCQ▾

Question

The coordinates and momenta xi,pi(i=1, 2,3) of a particle satisfy the canonical Poisson bracket relation {xi,pj}=δij . If C1=x2p3+x3p2 and C2=x1p2x2p1 are constants of motion, and if C3={C1,C2}=x1p3+x3p1 , then – (June)

Choices

Choice (4) Response

a.

{C2,C3}=C1and{C3,C1}=C2

b.

{C2,C3}=C1and{C3,C1}=C2

c.

{C2,C3}=C1and{C3,C1}=C2

d.

{C2,C3}=C1and{C3,C1}=C2

Question number: 154

» Thermodynamic and Statistical Physics » Classical and Quantum Statistics

Appeared in Year: 2014

MCQ▾

Question

Let y=12(x1+x2)μ ; where x1 and x2 are independent and identically distributed Gaussian random variables of mean μ and standard deviation σ . Then y4σ4 is – (June)

Choices

Choice (4) Response

a.

1

b.

12

c.

34

d.

14

Question number: 155

» Thermodynamic and Statistical Physics » Introduction to Nonequilibrium Processes

Appeared in Year: 2014

MCQ▾

Question

When a gas expands adiabatically from volume V1 and V2 by a quasi – static reversible process, it cools from temperature T1 to T2 . If now the same process is carried out adiabatically and irreversibly, and T2 is the temperature of the gas when it has equilibrated, then – (December)

Choices

Choice (4) Response

a.

T2=T2V1V2

b.

T2>T2

c.

T2=T2(V2V1V2)

d.

T2=T2

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