Question # 1

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

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

Which of the following phenomenon gives evidence of the molecular structure of mater

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Evaporation

Diffusion

Brownian movement

All of the above

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

The actual gas can behave like an ideal gas at

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Low density and high pressure

High density and high pressure

Low density and low pressure

High density and low pressure

Identify the irreversible process

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Explosion of a bomb

Slow expansion of a gas

Slow compression of a gas

Slow compression of an eleastic spring

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

The kinetic molecular model of matter describe matter an being made up of molecules in continuous.

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Vibratory motion

Random motion

rotatory motion

Linear motion

If T1 and T2 are source and sink temperature respectively Carnot efficiency is.

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T1+T2/T1

T1-T2/T1

T1+T2/T2

T1-T2/T2

The follow of heat from hot body to cold body is an example of

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Adiabatic process

Isothermal process

Reversible process

Irreversible process

A Carnot engine has the same efficiency between (i) 100 K and 500 K and ii) T and 900 K What will be T.

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90 K

100 K

180 K

200 K

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

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

If the gas pressure is increased then its mean free path becomes.

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More

Zero

Infinite

Less

The thermal inertia of a thermodynamic system is known as its.

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Entropy

Enthalpy

Isothermal conduction

Adiabatic conduction

How solid hydrogen is obtained.

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By cascade process

By joule kelvin effect

By adiabatic expansion

Lowering temperature below melting point

Heat Carnot be transferred from a colder to a hotter region unless work is done This is the statement of.

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Firs law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamcis

According to kinetic theory of gases one assumes that the collisions between molecules are.

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Perfectly elastic

Perfectly inelastic

Partly elastic

Partly inelastic

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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