CSIR Physical Sciences: Questions 157 - 160 of 401

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Question number: 157

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

If the number density of a free electron gas in three electron gas in three dimensions is increase eight times, its Fermi temperature will –

(December)

Choices

Choice (4) Response

a.

Increase by a factor of 4

b.

Decrease by a factor of 8

c.

Increase by a factor of 8

d.

Decrease by a factor of 4

Question number: 158

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

Question

A plane electromagnetic wave incident normally on the surface of a material is partially reflected. A measurement on the standing wave in the front of the interface shows that the ratio of the electric field amplitude at the maxima and the minima is 5. The ratio of the reflected intensity to the incident intensity is (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 159

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2011

MCQ▾

Question

The internal energy E of a system is given by Equation , where b is a constant and other symbols have their usual meaning. The temperature of this system is equal to – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 160

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2014

MCQ▾

Question

Consider a Low Pass (LP) and High Pass (HP) filter with cut – off frequency Equation and Equation respectively, connected in series or in parallel configuration as shown in figure A and B below:

Series and Parallel Configuration of HP and LP filter

Series and Parallel Configuration of HP and LP Filter

In figure Low Pass (LP) and High Pass (HP) filter, connected in series and parallel configuration as shown in figure A and B, respectively.

Which of the following statement is correct? (December)

Choices

Choice (4) Response

a.

For Equation , A acts as a Band Pass filter and B acts as a Band Reject filter.

b.

For Equation , A passes the signal without filtering and B acts as a Band Reject filter.

c.

For Equation , A acts as a Band Pass filter and B passes the signal without filtering.

d.

For Equation , A stops the signal from passing through and B passes the signal without filtering.

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