Question # 1

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

The motion of gas molecules is

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In the same direction

Random

Walls of container

Opposite to each other

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 difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

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

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

The number of spark plug needed in diesel engine is

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0

2

3

4

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

Not change in entropy of a system after one complete Carnot cycle is.

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Positive

Negative

Zero

None of these

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 internal energy of system does not depend on

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Temperature

Pressure

Path

Final and initial state

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

Entropy remains constant.

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Isothermal process

Adiabatic process

Isochoric process

Isobaric process

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

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Force

Momentum

Energy

Power

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

For working of heat engine, there must be.

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A source

A sink

either of these

Both of these

Size of the molecules is much smaller as compared to the

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Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

Average translational K.E. of molecules for an ideal gas is given as

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1/2 KT

KT

2/3 KT

3/2 KT

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

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

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

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Pressure

volume

Mass

Temperature

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