Question # 1

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

In the free expansion of a perfect gas there is no.

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work done

Heat exchnged

Internal energy changed

All of the above

Thermal conduction in metals differs from thermal conduction in insulators,. The reasons for this is that , in metals heat can be transported by.

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Electrons

Lattice vibrations

Photons

Positive ions

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

A Carnot engine can be 100% efficient of the sink is at.

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0 k

0 oF

0 oC

273 K

Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.

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Conduction or diffusion

Convection

Radiation

Mass transfer

The internal inertia of a thermodynamics system is known as.

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Enthalpy

Entropy

Isotherm

Adiabatic

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

What is the necessary condition for Boyle's law to hold good.

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Isothermal

Adiabatic

Isobaric

Isochoric

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

What is the represented by the area inside the Carnot cycle.

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Heat taken to increase the body temperature.

Energy loss due to leakage

Useful work done

Heat rejected by the system

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

On which of the following the kinetic theory of gases is not applicable.

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Water vapour

Smoke particles

Bound particles

Free electrons

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

The internal energy of an isolated system

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Is zero

Keeps on changing

Remains constant

Cannot be judged

The phenomenon of Brownian motion shows that

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Molecules exist and can be seen as bright dots moving about

Molecules moves about randomly at highs speeds

Smoke particles behaves as molecules

Smoke particles can be used as models of air molecues.

Because of second law of thermodynamics about the direction of energy flow what is possible.

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Heat

Light

Energy

life

Absolute zero may be regarded as the temperature of which

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Water freezes

All substances are solids

All gases become liquids

Molecular motioning a gas would ceases

The SI unit of heat capacity is.

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kg J

Kg J-1

J K-1

Kg J-1 K-1

An ideal engine can be 100% efficient only if its exhaust temperatute.

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Equal to input temperature

Less than is input temperature

More than its input temperature

0 ^oC

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