Question # 1

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

Which of following is irreversible process

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Slow compression of an elastic spring

Slow evaporation of substances in isolated vessel

Slow expansion of a gas

A chemical explosion

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

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

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100%

70%

60%

50%

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

At which of the following temperature a body has maximum internal energy.

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-273 ^oC

0 K

273 K

-273 K

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

If the temperature of sink is absolute zero then the efficiency of heat engine engine should be.

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100%

50%

Infinite

zero

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

The motion of gas molecules is

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In the same direction

Random

Walls of container

Opposite to each other

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

Average translational K.E. of molecules for an ideal gas is given as

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1/2 KT

KT

2/3 KT

3/2 KT

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%

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

The number of spark plug needed in diesel engine is

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0

2

3

4

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