Question # 1

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

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 change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

No of spark plugs needed in the diesel engine are.

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0

1

2

3

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

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

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

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

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