Question # 1

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

Average translational K.E. of molecules for an ideal gas is given as

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1/2 KT

KT

2/3 KT

3/2 KT

Which of following is irreversible process

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Slow compression of an elastic spring

Slow evaporation of substances in isolated vessel

Slow expansion of a gas

A chemical explosion

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

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All 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

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

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

For working of heat engine, there must be.

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A source

A sink

either of these

Both 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

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

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 a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

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

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None 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 unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

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