Question # 1

What is world's average surface air temperature.

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5 ^oC

10^oC

15 ^oC

20 ^oC

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

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

Which following properties of molecules of a gas is same for all gases at a particular temperature.

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Momentum

Mass

velocity

K.E.

How solid hydrogen is obtained.

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By cascade process

By joule kelvin effect

By adiabatic expansion

Lowering temperature below melting point

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

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Zero

Infinite

Less

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

Which one of the following is an example of a reversible process.

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Work done against friction

Heat produced by current

Melting of ice

See back effect

Gases exert pressure on walls of the vessels because gas molecules.

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Possess momentum

Have finite volume

Collide with each other

Obey gas laws

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

Which of the following should not change in an Isothermal process.

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Volume

Pressure

Temperature

All of these

How much lce will melt by 50,000 J of heat.

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120 J

130 g

140 J

150 g

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

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

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1.29

1.30

1.40

1.67

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

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1

2

3

Infinite

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

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

What is the average K.E. of gas molecules at temperature equal to K.

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kt/3

3/2 KT

1/2 KT

2/3 KT

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

First law of thermodynamics is a

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Boyle 's law

Charles' law

Law of energy conservation

Steffen Boltzmann law

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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