Question # 1

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

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

The internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

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

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

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

Efficiency of steam locomotive is.

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8%

10%

9%

7%

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

When temperature of source and sink of a heat engine becomes equal then the entropy change will be.

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zero

Minimum

Maximum

Negative

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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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