Question # 1

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

A carnot cycle consists of

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One step

two step

three steps

four steps

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

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 thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

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

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

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

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

It is impossible to devise a processes which may convert heat, extracted from a single reservoir, entirely into work without leaving any change in the working system. This is the statement of

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Clausius statement of second law

Kelvin'sstatement of second law

Clausius statement of first law

Kelvin's statement of first law

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

Pressure may be define as _______ per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:

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Newton's second law

Pascal's law

Carnot theorem

Second law of thermodynamics

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

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

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

The Boltzman constant has the value

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1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

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reversible process

irreversible process

any one of them

none of them

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

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

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

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

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