Question # 1

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

From any substance the temperature and pressure at which the material can coexist in all three states in equilibrium is called.

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Critical point

Triple point

Initial point

Final point

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

In an isochoric process.

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Volume changes

Pressure changes

Temperature changes

Volume remains constant

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

The internal energy of monoatomic gas is.

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3/2 RT

Independent of temperature

In the form of K.E.

Partially kinetic and partially potential

The efficiency of a diesel engine is about

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15% to 35 5

355 to 40%

45% to 655

505 to 65 %

Efficiency of a Carnot engine depends on

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Temperature

Pressure

Volume

The nature of working substance

What should be the shape of an ideal thermometer.

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Sphereical

Cubical

Cylindrical

Rectangular

The pressure of a gas is directly proportions 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

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

Which law states that two given samples of an ideal gas at the same temperature pressure and volume contain the same number of molecules.

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Charles law

Avogadro's

Boyles law

Boizmann law

First law of thermodynamics is a

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Boyle 's law

Charles' law

Law of energy conservation

Steffen Boltzmann law

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

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

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

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

The base unit of temperature in SI is

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Fahrenheit

Celsius

Kelvin

Rnakine

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.

Which of the following phenomenon gives evidence of the molecular structure of mater

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Evaporation

Diffusion

Brownian movement

All of the above

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