Question # 1

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both of them

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

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

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Pressure

Work

Density

Force

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

Which of the following is a state variable

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entropy

pressure

volume

all of them

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

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 value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

Since the absolute scale is independent of the property of the working substance, hence, can be applied at

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very high temperature

very low temperature

any one of them

none of them

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

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