Question # 1

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

The total gain in entropy of the working substance in a Carnot cycle is.

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Positive

Negative

Infinite

Constant

Which of the following is an example of irreversible process.

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Melting of ice

Work done against friction

Pettier heating and cooling

All isothermal and adiabatic changes

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

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More

Zero

Infinite

Less

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

What should be the shape of an ideal thermometer.

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Sphereical

Cubical

Cylindrical

Rectangular

What is a thermal properly of a material that determines the quantity of energy required to change the phase of a unit mass of that substance.

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Specific heat

Latent heat

Internal energy

Specific energy

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

In ideal gas equation PV = nRT , R is

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Universal gas constant

Avogadro's number

Plank's constant

Gravitational constant

The practical efficiency of a heat engine is

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25% to 30.5 %

35% to 45%

30% to 45%

15% to 25%

What happens to Carnot efficiency if the source temperature increases.

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Decreases

Increases

Remain the same

Becomes zero

Which one of the following gases posses maximum oot mean square velocity.

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Hydrogen

Oxygen

Nitrogen

Carbon dioxide

Under an isothermal process internal energy of the system.

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Increases

Decreases

Remain constant

is Zero

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

The term used for heat capacity per unit mass is.

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Latent heat

Specific heat

Energy density

Specific energy

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 can be used visualize the third law thermodynamics

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Light

Heat

Water

All of these

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

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

Specific heat a different substances varies becouse of

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Same number of molecules in unit mass

Different number of molecules in unit mass

Different K.E. of molecules in unit mass

Same K.E. of molecules in unit mass

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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