NEST (National Entrance Screening Test) Physics: Questions 25 - 27 of 58

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Question number: 25

» Physics and Measurement » Dimensions of Physical Quantities

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Appeared in Year: 2009

MCQ▾

Question

A physical quantity is expected to behave, according to theory, as , where are unknown positive constants. Measurements are made for for a number of values of , including . The best way to proceed to verify the relation and to determine and is –

Choices

Choice (4) Response

a.

To plot vs . Slope will give .

b.

To find for each measurement. Plot vs and fit it to a straight line. Slope of the line will give and intercept will give .

c.

To plot vs for various values of till we get a straight line graph. Then the slope of the line gives .

d.

To plot vs . Employ the relation for some . Take the average value of .

Question number: 26

» Thermodynamics » Carnot Engine and Its Efficiency

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Appeared in Year: 2013

MCQ▾

Question

An engine absorbs heat at a temperature of and exhausts heat at a temperature of . The engine operates at the maximum possible efficiency. The amount of work the engine performs for of heat input can be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 27

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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Appeared in Year: 2013

MCQ▾

Question

An airplane of wingspan is traveling at in a region where the earth’s magnetic field is . The maximum voltage that can possibly be developed between the ends of the wing is –

Choices

Choice (4) Response

a.

b.

c.

d.