Question # 1

The process in which a system undergoes a change of state at constant volume.

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

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

The mechanical equivalent of heat is.

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Physical quantity

Constant

Conversion factor

Zero

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

Which of the following gases has the maximum rms speed at STP.

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O2

H2

N2

CO2

The ration of Universal gas constant and Avogadro's number is called.

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Equilibrium constant

Velocity constant

Boitzmann's constant

Gravitational constant

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

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.

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

The base unit of temperature in SI is

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Fahrenheit

Celsius

Kelvin

Rnakine

The internal energy of an isolated system

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Is zero

Keeps on changing

Remains constant

Cannot be judged

In order of a cyclic heat engine operating between two heat reservoirs to be as efficient as a Carnot engine. It must be.

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A gas engine

Adiabatic

Reversible

A refrigerator

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

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1

2

3

Infinite

Because of second law of thermodynamics about the direction of energy flow what is possible.

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Heat

Light

Energy

life

What is the human body temperature in Celsius scale.

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30 oc

36. 9 oC

98. 4 oC

100 oC

In ideal gas equation PV = nRT , R is

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Universal gas constant

Avogadro's number

Plank's constant

Gravitational constant

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.

Internal energy of a gas decreased when

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It gains heat

Change in cycle

Change in adiatatic

Change in reversible

Which one is the primary standard for temperature measurement.

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Resistance thermometer

Mercury in glass thermometer

Constant volume gas thermometer

Pyrometer

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

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

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