Question # 1

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

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

In all natural processes where heat flows from one system to another, there is always a net

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decrease in entropy

increase in entropy

decrease or increase in entropy

none of them

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

Which of the following is a state variable

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entropy

pressure

volume

all of them

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

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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1 : 2

2 : 3

3 : 4

8 : 9

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

When heat is removed from the system

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negative

positive

zero

any one of them

The absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

Absolute temperature can be calculated by

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Means squares velocity

Motion of the molecule

Both A and B

None of these

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

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

The volume of universal gas constant R is:

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8.314 J/K mole K

8314 J/K mole K

8.314 J/mole K

None of these

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

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

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

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rays

Thermal radiation

None of these

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

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 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

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

Specific heat at constant pressure is greater than the specific heat at constant volume because

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Heat is used up to increase temperature at constant pressure

Heat is used by gas for expansions purposes at constant pressure

Heat is use dup to increase internal energy

The above statement is invalid

During the whole carnot cycle

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Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

The relationship between Boltzmann constant k with R and N_Ais given as:

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k = RN_A

k =R/N_A

k = NR/N_A

None of these

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

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

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