Question # 1

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

The state in which ice, water and vapour coexists in equilibrium is called

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zero degree celsius

zero degree fahrenheit

absolute zero

373 K

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 coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

In case of an ideal gas, the P.E associated with its molecule is

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maximum

zero

minimum

not fixed

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

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

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 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

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

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

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

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

Amount of heat required to raise the temperature of a body through 1 K is called its

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Specific heat

Water equivalent

Thermal capacity

Entropy

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

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A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

Absolute temperature can be calculated by

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Means squares velocity

Motion of the molecule

Both A and B

None of these

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

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

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

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

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

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

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

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

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

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

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

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

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