Question # 1

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

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35 %

40 %

35 to 40 %

25 %

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

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

At absolute temperature, the kinetic energy of the molecules

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Becomes zero

Becomes maximum

Becomes minimum

Remain constant

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

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

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

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

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

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

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

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

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

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

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

In thermodynamics, internal energy is the function of

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temperature

pressure

state

none of them

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

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

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

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

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35 %`

40 %

35 - 40 %

25 %

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

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

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

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