Question # 1

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

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

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

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

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25%

50%

70%

100%

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

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

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

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100%

70%

60%

50%

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

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 difference between tow molar capacities is equal to.

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Plank's constant

General gas equation

Molar gas constant

Boltzmann constant

A cycle of petrol engine undergoes

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Two process

Three process

Four process

single process

Heat is form of.

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Power

Momentum

Energy

Torque

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

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