Question # 1

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

The volume of a goas at constant pressure is directly proportional to the temperature as measured on the.

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Celsius scale

Kelvin scale

Fahrenheit scale

Baume scale

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

At the temperature of -273 ^oC. pressure of a gas at constant volume becomes zero This specific temperature is called.

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Freezing point

Critical temperature

Absolute zero

Terminal point

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

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

Which of the following can be used visualize the third law thermodynamics

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Light

Heat

Water

All of these

The heat required to sublime one mole of the substance at standard temperature and pressure is called.

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Latest heat

Specific heat

Heat of sublimation

Heat capacity

The phenomenon of Brownian motion shows that

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Molecules exist and can be seen as bright dots moving about

Molecules moves about randomly at highs speeds

Smoke particles behaves as molecules

Smoke particles can be used as models of air molecues.

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

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

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

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Natural temperature

Boyle temperature

Critical temperature

Absolute zero

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

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 is world's average surface air temperature.

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5 ^oC

10^oC

15 ^oC

20 ^oC

The pressure necessary to liquify a gas at the critical temperature is called.

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Normal pressure

Atmospheric pressure

Critical pressure

Liquid pressure

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

A heat engine with 100% efficiency would have to

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Do no work

Be at a uniform temperature

Use no heat

Discharge at 0^oC

Two stem engine A and B have their sources at 900 K and 600 K and their sinks are at 450 K and 300 K respectively.

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They are equally efficient

A is less efficient than B

a is more efficient than B

Their efficiencies cannot be determined

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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