Question # 1

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

In which process the condition for the application of Boyle's law on the gas is fulfilled

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isochoric process

adiabatic process

isothermal process

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

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

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

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

A reversible cycle is the one in which

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some of the changes are reversible

all of the changes are reversible

all of the changes are irreversible

none of them

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

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

If a process cannot be retraced in the backward direction by reversing the controlling factors, it is

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a reversible process

an irreversible process

any one of them

both 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

A diatomic gas molecule has

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translational energy

rotaional energy

vibrational energy

all of them

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

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

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collision will be in straight lines

Collision will not change

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

A real gas can be approximated to an ideal gas at

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Low density

High pressure

High density

Low temperature

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

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-20°C

6.67°C

5°C

0°C

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 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

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

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 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

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