Question # 1

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

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

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

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

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

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

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

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

No of spark plugs needed in the diesel engine are.

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0

1

2

3

For an ideal gas, the internal energy is directly proportional to.

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Pressure

volume

Mass

Temperature

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

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