Question # 1

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Heat is form of.

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Power

Momentum

Energy

Torque

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

Efficiency of steam locomotive is.

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8%

10%

9%

7%

The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.

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28o J

920 J

600 J

200 J

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

Entropy remains constant.

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Isothermal process

Adiabatic process

Isochoric process

Isobaric process

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

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Physics Fsc Part 1 Chapter 11 Online Test MCQs With Answers

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