Question # 1

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

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

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

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

The energy processes, we use are

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Efficient

Not efficient

Reversible

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%

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 constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

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

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

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

The actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

the change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

Heat is form of.

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Power

Momentum

Energy

Torque

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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

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