Question # 1

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

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

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Pressure

volume

Mass

Temperature

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

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

The unit o pressure of gas is

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Nm^-2

Pascal

Atmosphere

All of these

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

First law of thermodynamics can be defined by the equation

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Not change in entropy of a system after one complete Carnot cycle is.

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Positive

Negative

Zero

None of these

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

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Force

Momentum

Energy

Power

In case the work done in zero.

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Constant pressure

Constant volume

Constant temperature

Constant mass

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Physics English Medium Fsc Part 1 Chapter 11 Online MCQs Test MCQs With Answers

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