Question # 1

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

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

Which remains constant in an adiabatic process.

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Volume

Pressure

entropy

temperature

The difference between tow molar capacities is equal to.

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Plank's constant

General gas equation

Molar gas constant

Boltzmann constant

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

For working of heat engine, there must be.

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A source

A sink

either of these

Both of these

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

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

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

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%

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

First law of thermodynamics can be defined by the equation

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In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

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

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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