Question # 1

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

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

Not change in entropy of a system after one complete Carnot cycle is.

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Positive

Negative

Zero

None of these

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

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

If heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

The number of spark plug needed in diesel engine is

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0

2

3

4

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

The difference between tow molar capacities is equal to.

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Plank's constant

General gas equation

Molar gas constant

Boltzmann constant

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

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