Question # 1

The efficiency of a Carnot Heat Engine is 100% if temperature of sink T2 is.

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0 ^oC

0 K

0 ^oF

100 K

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

For an ideal gas, the internal energy is directly proportional to.

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Pressure

volume

Mass

Temperature

Heat is form of.

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Power

Momentum

Energy

Torque

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

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 efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

If the temperature of sink is absolute zero then the efficiency of heat engine engine should be.

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100%

50%

Infinite

zero

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

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