Question # 1

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

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

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%

For a diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

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

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

Entropy remains constant.

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Isothermal process

Adiabatic process

Isochoric process

Isobaric process

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

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 difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

Efficiency of steam locomotive is.

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8%

10%

9%

7%

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

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

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Calorimeter

Heat engine

thermometer

Voltmeter

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 molecules of an ideal gas exert

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Force on each other

No force on each other

Large force on each other

Pressure on each other

The Carnot cycle can be shown by which graph

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P - T graph

P - V Graph

V- T graph

PV -T graph

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

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