Question # 1

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

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

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

How many calories of heat are required to evaporate completely 1 g or ice at 0^oC

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120 calories

520 calories

720 calories

920 calories

The number of molecules or atoms in a specific volume of a gas is independent of their

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Volume

Pressure

Size

Temperature

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

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

When a liquid is hated retaining its liquid sate then its molecules gain.

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K.E.

P.E

Heat energy

Chemical energy

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

If two gases have same reduced pressure volume and temperature it is according to

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Boyle's law

Charles law

Law of corresponding state

Zeroth law

Which of the following parameters does not characterize the thermodynamic state of matter.

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Temperature

Pressure

Volume

work

What happens to internal energy of a piece of lead when hammered.

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Increases

Decreases

Remains unchanged

Becomes zero

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

Which of the following is the ideal gas equation.

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PV -n RT

P/V = n RT

V/P = nR/T

PV = T/nR

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

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More

Zero

Infinite

Less

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

Random

Woolen clothing a effective in keeping us warm because.

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An trapped int he wool acts as an insulator

Heat loss by convection and radiation is prevented

Wool is bad traciator and good absorber of heat

Wool can retain high temperatures

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

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

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Heat

Light

Energy

life

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