Question # 1

In thermodynamics system internal energy decrease by 100 J and 100 J of work done on the system then heat lost will be.

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Zero

100 J

200 J

-200 J

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 heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The motion of gas molecules is

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In the same direction

Random

Walls of container

Opposite to each other

At constant temperature and pressure, if volume of given mass of a gas is doubled then density is.

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Doubled

1/4 original

1/2 of original

Unchanged

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

First law of thermodynamics can be defined by the equation

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In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

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

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50%

90%

40%

62%

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

In the thermodynamics process , the equation W = -delta U represents.

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The energy processes, we use are

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Efficient

Not efficient

Reversible

None of these

The difference between two molar capacities is equal to.

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Plank's constant

General gas constant

Molar gas constant

Boltzmann constant

The number of spark plug needed in diesel engine is

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0

2

3

4

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

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