Question # 1

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

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

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 behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

In thermodynamics system internal energy decrease by 100 J and 100 J of work done on the system then heat lost will be.

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Zero

100 J

200 J

-200 J

The motion of gas molecules is

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In the same direction

Random

Walls of container

Opposite to each other

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

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

No of spark plugs needed in the diesel engine are.

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0

1

2

3

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

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

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

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11th Class Part 1 Physics Chapter 11 Test Online MCQs With Answers

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