Question # 1

Why an even Carnot engine Carnot give 100% efficiency.

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We cannot find ideal sources

We cannot eliminate friction

We cannot reach absolute zero temperature

We cannot remove heat

A cup of coffee at 80 ^oC is left to cool to 30 oc if the heat capacity of the cup and coffee is 2.0 kJ k-1 how much heat is released during the cooling.

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0.04 kJ

100 KJ

60 kJ

160 kJ

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

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.

When all the systems taking part in a process are included, the entropy.

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Decreases

Either remains constant of increases

Either remains constant or decreases

Remains constnat

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

What should be the shape of an ideal thermometer.

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Sphereical

Cubical

Cylindrical

Rectangular

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

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Heat

Light

Energy

life

The specific heat of liquid

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Decreases with temperature

Increases with temperature

Remains constant with change in temperature

Increases with pressure

The SI unit of heat capacity is.

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kg J

Kg J-1

J K-1

Kg J-1 K-1

Let at constant temperature the pressure of an ideal gas be doubled so that the new volume is.

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Doubled the original volume

Same as original volume

Reduced to half the original volume

Reduced to two times the original volume

Below which temperature gas can be liquified by increasing its pressure.

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Natural temperature

Boyle temperature

Critical temperature

Absolute zero

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

A sample of an ideal gas may i) energy adiabatically, or ii) Expand isothermally. the net flow of heat into the gas from the exterior is.

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Positive is each case

Negative for i) and positive for ii)

Zero for i) and positive for ii)

Positive for i) and negative for ii)

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

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Zero

Infinite

Less

To which law of thermodynamics, the concept of temperature is related to.

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Zeroth law

First law

Second law

Third law

In an isochoric process.

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Volume changes

Pressure changes

Temperature changes

Volume remains constant

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 process is which volume of the system remains constant.

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Isobaric process

Isochoric process

Isothermal process

Adiatatic process

Which of the following is an example of an irreversible process.

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Isothermal and adiabatic process

Melting of ice

Work done against friction

Pettier effect

The pressure of a goas is directly proportion to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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