Question # 1

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

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

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

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

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

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

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Force

Momentum

Energy

Power

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

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%

Value of triple point of water is given as.

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Zero K

100 K

273.16 K

373.16 K

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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

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 ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

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

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

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Physics ICS Part 1 Chapter 11 Online Test MCQs With Answers

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