Question # 1

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

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

Energy gas behaves like an ideal gast at

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High temperature and low pressure

Low temperature and high pressure

Both A and B

None

The motion of molecules in gases is:

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Orderly

Random

Circular

All 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

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

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

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 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

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

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

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

Generally a temperature scale is established by using certain physical properties of a material which varies

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nonlinearly with temperature

linearly with temperature

either of them

none of them

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

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

A succession of events which bring the system back to its initial condition is called

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reversible process

irreversible process

a cycle

none of them

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

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all 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

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

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

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

Adiabatic change occurs when the gas

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expands

compressed

expands or compressed

expands or compressed rapidly

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

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

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