Question # 1

What makes the air coming out of a punctured tyre cool.

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Isothermal expansion

Adiabatic expension

Flow at high speed

Atmospheric pressure

Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other.

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Third law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

Contrivances for converting heat into work are called.

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Heat pumps

Heat engines

IC engines

Jet engine

If temperature of the sink is decreased the efficiency of a Carnot engine

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Increases

Decreases

Remains constant

First increases and thend ecreases

Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.

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It remains the same

It increases by a factor of 2

It increases by a factor of 4

It increases by a factor of 8

Law of increase of entropy is a result of

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

A convention current is the movement of fluid caused by the change in.

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Pressure

Temperature

Densities

Volume

A fixed mass of an ideal gas absorbs 1000 J of heat and expands under a constant pressure of 20 kPa from a volume of 25 x 10-3 m3 to a volume 50 x 10-3 The change internal energy of the gas is.

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500 J

1000 J

-1000 J

Zero

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

Advantage of using gases as thermornetic substrates is taht

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Gases have a small coefficient of expansion

Expansion of gases is irregular

Gases can be obtained in pure form

Gases have a large coefficient of expansion.

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

When the temperature of a body is equal to that of the surrounding then the body appears

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Dull black

Red hot

In thermal equilibrium

To be cold

Which of the following is a clinical thermometer.

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Gas thermometer

Mercury thermometer

Alcohol thermometer

Radiation thermometer

Pressure of a gas depends upon

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Only on the molecular speed

Only on the speed of molecules on a unit volume

Only on the mass of molecules

Number of molecules mass and speed in a unit volume

What is the amount of mechanical work done to melt 1 g of ic completely

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4.2 J

42 J

80 J

336 J

Convention is the transfer of thermal energy by means of currents in

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Pressure

Temperature

Liquids

Fluids

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

At absolute zero of temperature.

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The molecular energy is zero

Molecules have translational K.E

Molecules have rotational K.E.

Molecules have maximum energy

Which of the following is the science of measuring the heat of chemical reactions or physical changes.

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Thermometry

Calorimetry

Telemetry

Photometry

When a solid is melting the temperature remains constant even through heat is being supplied because the

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Heat is being used to break up the intermolecular bonds

Solid is not absorbing any heat

Molecules are moving faster

Molecules are farther a part

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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