Question # 1

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

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Isothermal expension

Isothermal compression

Adiabatic expansion

Adiabatic compression

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

First law of thermodynamics can be defined by the equation

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During adiabatic process, which factor remains constant.

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Entropy

Pressure

Momentum

Power

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

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

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

either of these

Both of these

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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

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Force

Momentum

Energy

Power

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

The mean kinetic energy of gas is at.

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0 ^oC

-273 ^oC

100 K

100 ^oC

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

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

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Physics ICS Part 1 Chapter 11 Online Test MCQs With Answers

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