Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 55 - 57 of 64

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Question number: 55

» Thermodynamic and Statistical Physics » Thermodynamic Potentials

Appeared in Year: 2011

MCQ▾

Question

A heater and a thermocouple are used to measure and control temperature T of a sample at . A feedback circuit supplies power ‘P’ to the heater according to the equation with approximately tuned values of coefficients G and D. In order to maintain temperature stability in the presence of an external heat perturbation which causes small but rapid fluctuation of temperature, it is necessary to, (December)

Choices

Choice (4) Response

a.

Decrease G

b.

Increase G

c.

Increases D

d.

Decrease D

Question number: 56

» Thermodynamic and Statistical Physics » Classical and Quantum Statistics

Appeared in Year: 2012

MCQ▾

Question

The dispersion relation of phonons in a solid is given by . The velocity of the phonons at large wavelength is, (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 57

» Thermodynamic and Statistical Physics » Random Walk

Appeared in Year: 2016

MCQ▾

Question

Consider a random walk on an infinite two-dimensional triangular lattice, a part of which is shown in the figure below.

A part of two-dimensional lattice

A Part of Two-Dimensional Lattice

In figure a part of two dimensional lattice is shown.

If the probabilities of moving to any of the nearest neighbor site are equal, what is the probability that the walker returns to the starting position at the end of exactly three steps? (December)

Choices

Choice (4) Response

a.

b.

c.

d.

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