Question # 1

In which given process does the system always return to the original thermodynamic state.

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Cyclic

Adiabatic

isothermal

Isobaric

What is the average K.E. of gas molecules at temperature equal to K.

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kt/3

3/2 KT

1/2 KT

2/3 KT

The temperature which is the same in ^oC and ^oF is.

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-20

-40

20

40

If a gas does 10 J of external work white expanding then the change in internal energy is equal to.

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0 J

10 J

-10 J

100 J

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

How many calories of heat are required to evaporate completely 1 g or ice at 0^oC

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120 calories

520 calories

720 calories

920 calories

What makes the air coming out of a punctured tyre cool.

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Isothermal expansion

Adiabatic expension

Flow at high speed

Atmospheric pressure

The specific heat capacity of a substance is the amount of heat required to.

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Raise its temperature by 1 K

Raise the temperature of 1 kg of the substance by 1 K

Melt 1 kg of the substance

Boil 1 kg of the substance

During solid ficain the temperature.

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Remains constant at the freezing point

Increases at the freezing point

Decreases at the freezing point

Decreases at the melting point

In which temperature range water decreases in volume with increasing temperature.

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From 0 ^oC to 4 ^oC

from 0 ^oC to 10 ^oC

from 50 ^oC to 100 ^oC

from 75 ^oC to 100 ^oC

Triple point of water in Kelvin scale is

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0 K

100 K

273 .15 K

373.15 K

What is the represented by the area inside the Carnot cycle.

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Heat taken to increase the body temperature.

Energy loss due to leakage

Useful work done

Heat rejected by the system

When a liquid is hated retaining its liquid sate then its molecules gain.

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K.E.

P.E

Heat energy

Chemical energy

What type of process is the Carnot's cycle.

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Reversible

Irreversible

Neither reversible nor irreversible

May be reversible or irreversible

Which of the following has maximum specific heat.

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Glass

Iron

Brass

Lead

When all the systems taking part in a process are included, the entropy.

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Decreases

Either remains constant of increases

Either remains constant or decreases

Remains constnat

What happens to internal energy of a piece of lead when hammered.

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Increases

Decreases

Remains unchanged

Becomes zero

The kinetic molecular model of matter describe matter an being made up of molecules in continuous.

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Vibratory motion

Random motion

rotatory motion

Linear motion

Which is the heat transfer mode between an object and its environment due to circular fluid motion.

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Conduction

Convection

Radiation

Mass transfer

The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.

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It remains the same

It increases by a factor of 2

It increases by a factor of 4

It increases by a factor of 8

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

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