Question # 1

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

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 internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

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

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

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

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

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25%

50%

70%

100%

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

When temperature of source and sink of a heat engine becomes equal then the entropy change will be.

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zero

Minimum

Maximum

Negative

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

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

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

Size of the molecules is much smaller as compared to the

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Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

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 energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

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

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Positive

Negative

Zero

None of these

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

Pascal is the unit of

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Pressure

Force

Tension

Weight

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

the change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

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