CSIR Physical Sciences: Questions 352 - 355 of 401

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Question number: 352

» Thermodynamic and Statistical Physics » Maxwell Relations

Appeared in Year: 2012

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 353

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

Question

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

(June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 354

» Mathematical Methods of Physics » Linear Ordinary Differential Equations of First & Second Order

Appeared in Year: 2011

MCQ▾

Question

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

Choices

Choice (4) Response

a.

1

b.

Equation

c.

Equation

d.

Equation

Question number: 355

» Thermodynamic and Statistical Physics » Fermi Gases

Appeared in Year: 2011

MCQ▾

Question

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 Equation the degeneracy of each level is Equation . The lowest level is completely filled and the others are empty. The Fermi energy Equation , where, N is the total number of electrons, is – (December)

Choices

Choice (4) Response

a.

Coincident with the Equation level

b.

Midway between the Equation and the Equation levels

c.

Midway between the Equation and the Equation levels

d.

Coincident with the Equation level

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