Question # 1

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

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

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1/2

More than 1/2

Less than 1/2

Between 1 and 2

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

When two objects are rubbed together, their internal energy

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remains same

decreases

remains the same then decreases

increases

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

A carnot cycle consists of

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One step

two step

three steps

four steps

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

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

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

On colliding in a closed container, the gas molecules

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Transfer momentum to the walls

Momentum becomes zero

Move in opposite directions

Perform Brownian motion

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

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