Question # 1

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

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 diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

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

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

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Force

Momentum

Energy

Power

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

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

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50%

90%

40%

62%

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

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

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 temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

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

For working of heat engine, there must be.

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A source

A sink

either of these

Both 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%

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

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

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Physics ICS Part 1 Chapter 11 Online Test MCQs With Answers

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