Question # 1

If R is gas constant for 1 gram mole, C_pand C_vare specific heat for a solid then

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C_p- C_v= R

C_p- C_{v < R}

C_p- C_{v = 0}

C_p- C_{v > R}

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

The curve representing an isothermal process is called

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adiabat

isotherm

fixed temperature

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

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

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

The percentage of available heat energy converted into work by a petrol engine is roughly

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35 %

40 %

35 to 40 %

25 %

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 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

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

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

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

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

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

Adiabatic change occurs when the gas

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expands

compressed

expands or compressed

expands or compressed rapidly

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

Hydrogen and helium of same volume V at same temperature T and same pressure P are mixed to have same volume V. The resulting pressure of the mixtures will be

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R/2

P

2P

Depending on the relative mass of the gases

The curve representing an adiabatic process is called

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isotherm

adiabat

adiable

none of them

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

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 example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

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

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

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

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

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

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

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

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