Question # 1

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

Efficiency of steam locomotive is.

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8%

10%

9%

7%

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

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100%

70%

60%

50%

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

For an ideal gas, the internal energy is directly proportional to.

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Pressure

volume

Mass

Temperature

Pascal is the unit of

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Pressure

Force

Tension

Weight

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

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 diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

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

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

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

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

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Force

Momentum

Energy

Power

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