Question # 1

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

First law of thermodynamics can be defined by the equation

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The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

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 actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

For a diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

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

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50%

90%

40%

62%

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

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