Question # 1

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.

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28o J

920 J

600 J

200 J

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

The molecules of an ideal gas exert

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Force on each other

No force on each other

Large force on each other

Pressure on each other

S.I Unit of pressure of gas is.

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Nm

N.m

N2/m

N3m

During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

The number of spark plug needed in diesel engine is

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0

2

3

4

When temperature of source and sink of a heat engine becomes equal then the entropy change will be.

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zero

Minimum

Maximum

Negative

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

A gas performs 10 J of work while expanding adiabatically. the change in its internal energy is.

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10 J

-10 J

100 J

-200 J

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

Pascal is the unit of

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Pressure

Force

Tension

Weight

For a diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

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