Question # 1

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

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

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

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

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100%

70%

60%

50%

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

Heat is form of.

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Power

Momentum

Energy

Torque

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

The difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

Efficiency of steam locomotive is.

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8%

10%

9%

7%

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

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

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

S.I Unit of pressure of gas is.

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Nm

N.m

N2/m

N3m

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

A device based upon the thermodynamics property of matter is called.

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Calorimeter

Heat engine

thermometer

Voltmeter

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

A gas performs 10 J of work while expanding adiabatically. the change in its internal energy is.

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10 J

-10 J

100 J

-200 J

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

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