Question # 1

Efficiency of steam locomotive is.

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8%

10%

9%

7%

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

Which of following is irreversible process

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Slow compression of an elastic spring

Slow evaporation of substances in isolated vessel

Slow expansion of a gas

A chemical explosion

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

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

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Pressure

volume

Mass

Temperature

the change in internal energy is defined as

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Q - W

Q-T

Q + P

Q - P

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

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

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

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%

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

The behaviour of gases is discussed by

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Knowing their nature

Knowing their temperature

Kinetic theory

Maxwell's theory

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

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 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 difference between tow molar capacities is equal to.

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Plank's constant

General gas equation

Molar gas constant

Boltzmann constant

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

Efficiency of a heat engine working between 27 ^oC and 32 ^oC will be.

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50%

90%

40%

62%

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

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

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