Question # 1

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Size of the molecules is much smaller as compared to the

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Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

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

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

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100%

70%

60%

50%

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

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