Question # 1

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

The Boltzman constant has the value

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1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

On the exaust stroke, the outlet values opens. The residual gases are expelled and piston moves

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outwards

inwards

in either way

none of these

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

A carnot cycle consists of

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One step

two step

three steps

four steps

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

The internal energy of a system does not depend upon the

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initial state of the system

final state of the system

path

none of them

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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