Question # 1

In general work done on or by a gas depends on.

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The initial state only

The final state only

The initial and final states

The initial state the final state and the path

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

What is the human body temperature in Celsius scale.

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30 oc

36. 9 oC

98. 4 oC

100 oC

What is a thermal properly of a material that determines the quantity of energy required to change the phase of a unit mass of that substance.

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Specific heat

Latent heat

Internal energy

Specific energy

When a fluid in a cylinder expands through a distance 'd' against a piston of area 'A' which is exerting a constant pressure 'P' the work done is equal by.

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PAD

PA/d

Pd/A

Pd/A2

The term used for heat capacity per unit mass is.

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Latent heat

Specific heat

Energy density

Specific energy

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

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O2

H2

N2

CO2

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 %

The normal Human body temperature in Fahrenheit scale is.

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32 ^oF

40 ^oF

98.4^oF

212 ^oF

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

What type of process is the Carnot's cycle.

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Reversible

Irreversible

Neither reversible nor irreversible

May be reversible or irreversible

Identify the irreversible process

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Explosion of a bomb

Slow expansion of a gas

Slow compression of a gas

Slow compression of an eleastic spring

Heat Carnot be transferred from a colder to a hotter region unless work is done This is the statement of.

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Firs law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Zeroth law of thermodynamcis

The ideal thermal efficiency of a cyclic heat engine is limited by

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Friction in the engine

Amount of heat in the engine

Difference between input temperature and output temperature.

Amount of work

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

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

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

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Volume

Pressure

Temperature

Weight

In the free expansion of a perfect gas there is no.

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work done

Heat exchnged

Internal energy changed

All of the above

Temperature of a gas is related to.

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Total K.E. of the gas molecules

The K.E. of the centre of mass of the gas

The P.E. of the centre of mass of the gas

Total K.E. of the molecules w.r.t the centre of mass of gas

If volume of the gas doubled without changing its temperature the pressure of the gas is

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Reduced to half of original value

Not changed

Reduced to one fourth of original value

Doubled

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

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