Question # 1

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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2V

3V

0.5V

V

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

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 reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

The volume of universal gas constant R is:

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8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

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

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Pressure

Work

Density

Force

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

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

Amount of heat required to raise the temperature of a body through 1 K is called its

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Specific heat

Water equivalent

Thermal capacity

Entropy

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

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

none of them

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

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