Question # 1

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

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

Cloud formation in atmosphere is an example of.

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Isothermal process

Isochoric process

Adiabatic process

Isobaric process

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

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Force

Momentum

Energy

Power

The ideal gas law is.

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PV =NVk

P = NkT

PV =nRT

P=nRT

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

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

For working of heat engine, there must be

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A source

A sink

Ether of these

Both of them

Which one is true for isothermal process.

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Q = 0

W = 0

Q = W(D) Delta U = 0

None of these

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

The efficiency of any heat engine can never be

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+ve

100%

-ve

None of these

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Carnot cycle consists of.

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Two steps

Three steps

Four steps

Five steps

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

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Physics ICS Part 1 Chapter 11 Online Test MCQs With Answers

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