Question # 1

Which of the following is not an example of adiabatic process

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the rapid escape of air from a burst type

the rapid expansion and compression of air through which a sound wave is passing

cloud formation in the atmosphere

none of them

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

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

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

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

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positive

negative

zero

any one of them

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

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Pressure

Work

Density

Force

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

Which of the following is not an assumption of kinetic energy

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a finite volume of gas consists of very large number of molecules

the gas molecules are in random motion

collision between the gas molecules are inelastic

the size of the gas molecules is much smaller than the separation between molecules

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

The absolute temperature for an ideal gas is

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directly proportional to the rotational K.E of gas molecules

directly proportional to the vibrational K.E of gas molecules

directly proportional to the average translational K.E.of gas molecules

directly proportional to the P.E. of gas molecules

Rate of diffusion is

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Faster in solids than in liquids and gases

Faster in liquids than in solids and gases

Equal to solids, liquids and gases

Faster in gases than in liquids and solids

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

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

Which of the following is a state variable

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entropy

pressure

volume

all of them

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

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

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

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

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

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

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1.7 x 10³J

10.2 x 10³J

3..4 x 10³J

6.8 x 10³J

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

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