Question # 1

Thermodynamics deals with

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Isolated systems

The interactions among various parts of the system

The microscopic behavior of a system

The interactions between system and surrounding

On which parameter internal energy of an ideal gas depends upon.

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Volume

Mass

Pressure

Temperature

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

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

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

The temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

If the temperature of the source and sink are increased by same amount the efficiency of the engine.

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Increases

Decreases

Remains unchanged

May increases of decrease

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

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

Let at constant temperature the pressure of an ideal gas be doubled so that the new volume is.

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Doubled the original volume

Same as original volume

Reduced to half the original volume

Reduced to two times the original volume

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

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

Random

Difference between Cp and Cv is equal to

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General gas constant

Planck's conatant

Molar gas constant

Boltzmann's constant

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

When the temperature of a body is equal to that of the surrounding then the body appears

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Dull black

Red hot

In thermal equilibrium

To be cold

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

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

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Volume

Pressure

Temperature

Weight

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

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

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Light

Heat

Water

All of these

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

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