Question # 1

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

For working of heat engine, there must be.

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A source

A sink

either of these

Both of these

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

the change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

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 behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

Efficiency of steam locomotive is.

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8%

10%

9%

7%

Efficiency of a heat engine working between 27 ^oC and 32 ^oC will be.

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50%

90%

40%

62%

First law of thermodynamics can be defined by the equation

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The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

The motion of gas molecules is

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In the same direction

Random

Walls of container

Opposite to each other

Heat is form of.

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Power

Momentum

Energy

Torque

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

Pascal is the unit of

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Pressure

Force

Tension

Weight

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

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