Question # 1

First law of thermodynamics is a

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Boyle 's law

Charles' law

Law of energy conservation

Steffen Boltzmann law

The transfer of thermal energy between regions of matter due to a temperature gradient is called.

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Conduction

Radiation

Convection

Sublimation

When heat a supplied to a metallic sphere which one of the following changes will occur.

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the mass of the sphere increases

The volume of the sphere increases

The density of the sphere increases

The internal energy of the sphere increases

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

Difference between Cp and Cv is equal to

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General gas constant

Planck's conatant

Molar gas constant

Boltzmann's constant

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

A gas thermometer is more sensitive than a mercury thermometer because the expansion of gas for 1 o/c rise in temperature is.

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Five times as much as mercury

Ten times as much as mercury

Twenty times as much as mercury

Hundred times as much as mercury

In onw cycle of a steam engine there are how many dead centres.

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1

2

3

zero

Difference between the molar heat capacity constant pressure and that a constant volume is equal to

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Root mean square velocity

Mean free path

Boltzmann's constant

Universal gas constant

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

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

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

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

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Natural temperature

Boyle temperature

Critical temperature

Absolute zero

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

The highest efficiency of a heat engine whose low temperature is 17 oC and the high temperature of 200 oC is.

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20%

30%

35%

40%

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

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1

2

3

Infinite

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

Why freezer a refrigerator is located in the top section

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Motor is not affected

Heat gained from environment is less

The entire chamber of freezer is cooled quickly

Heat gained from environment is more

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

Contrivances for converting heat into work are called.

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Heat pumps

Heat engines

IC engines

Jet engine

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

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