Question # 1

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

Which of the following is a state variable

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entropy

pressure

volume

all of them

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

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

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Translatory

Rotatory

Vibratory

None of these

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

Pressure of a gas at constant volume is proportion to

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Total energy of gas

Average P.E to molecules

Average K.E of molecules

Total internal energy of gas

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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2V

3V

0.5V

V

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

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

The ideal gas law is

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P = nRT

V = nRT

PV =RT

PV =nRT

The pressure of gas everywhere inside the vessel will be the same provided the gas is of

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Non-uniform density

uniform density

high density

low density

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

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

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positive

negative

zero

any one of them

The internal energy of a system does not depend upon the

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initial state of the system

final state of the system

path

none of them

If the formula PV = nRT, n denotes:

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Number of molecules per unit volume

Number of moles

Number of molecules

None of these

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

A carnot cycle consists of

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One step

two step

three steps

four steps

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

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

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

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

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