Question # 1

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

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100%

70%

60%

50%

Pascal is the unit of

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Pressure

Force

Tension

Weight

Heat is form of.

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Power

Momentum

Energy

Torque

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

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

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Positive

Negative

Zero

None of these

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

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25%

50%

70%

100%

For working of heat engine, there must be.

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A source

A sink

either of these

Both of these

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

First law of thermodynamics can be defined by the equation

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The number of spark plug needed in diesel engine is

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0

2

3

4

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.

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28o J

920 J

600 J

200 J

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

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