Question # 1

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

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Ideal gas

Inert gas

Real gas

None of these

The work done by the system on its environment is considered as

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positive

negative

zero

any one of them

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

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81 K

355 K

627 K

627°C

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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adiabatically

isothermally

isochorcally

isobarically

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

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1/2

More than 1/2

Less than 1/2

Between 1 and 2

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

One kilogram of different substances contain

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same number of molecules

different number of molecules

may be same or different

none of them

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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