Question # 1

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

Which gas strictly obeys gas laws.

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Hydrogen gas

Inert gas

Ideal perfect gas

Helium gas

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

On which temperature scale a degree is 1/180 of the interval between the freezing point and the boiling point.

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Celsius scale

Fahrenheit scales

Rankine scale

Kelvin scale

One calorie equals to

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1.2 J

2.2 J

3.2 J

4.2 J

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

A heat engine with 100% efficiency would have to.

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Do no work

Be at uniform temperature

Use no heat

Discharge of 0 ^oC

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

What makes the air coming out of a punctured tyre cool.

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Isothermal expansion

Adiabatic expension

Flow at high speed

Atmospheric pressure

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

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More

Zero

Infinite

Less

Under steady state the temperature of a body

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Increase's with time

Decreases with time

Does not charge with time

None of the above

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

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

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1

2

3

Infinite

What is the SI unit for thermal conductivity.

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W m-1 K-1

W m-2 k-2

W m-3 k-1

J kg -1 k-1

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

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

The zero point of Kelvin scale is called.

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Critical point

Terminal point

Absolute zero

Mid point

During an adiabatic gas expansion the environment

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Serves as a heat sink

Serves as a heat source

Must be at a higher temperature than the gas

Does not have to participate

Which temperature is the absolute measure of temperature.

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Thermodynamic temperature

Freezing point

Boiling point

Absolute zero

Law of increase of entropy is a result of

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamics

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

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