CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 351 - 355 of 696

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Question 351

Appeared in Year: 2011

Question MCQ▾

A gas of N non- interacting particles is in thermal equilibrium at temperature T. Each particle can be in any of the possible non – degenerate state of energy . The average energy per particle of the gas, when , is – (December)

Choices

Choice (4)Response

a.

ε

b.

c.

d.

Edit

Question 352

Appeared in Year: 2012

Question MCQ▾

The energy required to create a lattice vacancy in a crystal is equal to . The ratio of the number densities of vacancies , when crystal is equilibrium at 1200 K and 300 K, respectively, is approximately, (June)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 353

Appeared in Year: 2011

Question MCQ▾

Two gravitating bodies A and B with masses and , respectively, are moving I circular orbit. Assume that and let the radius of the orbit of body A be . If the body A is losing mass adiabatically, its orbital radius is proportional to –

(June)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 354

Appeared in Year: 2011

Question MCQ▾

Let and be two linearly independent solutions of the differential equation, and let . If , then is given by, (December)

Choices

Choice (4)Response

a.

b.

c.

d.

1

Edit

Question 355

Appeared in Year: 2011

Question MCQ▾

The energy levels of electrons of mass ‘m’ and charge ‘e’ confined in an area A in the xy – plane with a uniform magnetic field B applied in the z – direction are given by the degeneracy of each level is . The lowest level is completely filled and the others are empty. The Fermi energy , where, N is the total number of electrons, is – (December)

Choices

Choice (4)Response

a.

Midway between the and the levels

b.

Midway between the and the levels

c.

Coincident with the level

d.

Coincident with the level

Edit