Question # 1

The temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

If volume of the gas doubled without changing its temperature the pressure of the gas is

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Reduced to half of original value

Not changed

Reduced to one fourth of original value

Doubled

A heat engine with 100% efficiency would have to.

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Do no work

Be at uniform temperature

Use no heat

Discharge of 0 ^oC

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

Contrivances for converting heat into work are called.

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Heat pumps

Heat engines

IC engines

Jet engine

Thermodynamics deals with

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Isolated systems

The interactions among various parts of the system

The microscopic behavior of a system

The interactions between system and surrounding

According to kinetic energy of gases one assumes that the collisions between the molecules are.

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Perfectly elastic

Perfectly inelastic

Partly elastic

Partly inelastic

At the temperature of -273 ^oC. pressure of a gas at constant volume becomes zero This specific temperature is called.

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Freezing point

Critical temperature

Absolute zero

Terminal point

Most cooking involves

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Adiabatic process

Isothermal process

Isobaric process

Isochoric process

A diatomic gas contains only

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Translational K.E.

Rotational K.E.

Vibrational K.E.

All of these

Absolute zero may be regarded as the temperature of which

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Water freezes

All substances are solids

All gases become liquids

Molecular motioning a gas would ceases

Which of the following is an example of an irreversible process.

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Isothermal and adiabatic process

Melting of ice

Work done against friction

Pettier effect

Temperature of a gas is related to.

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Total K.E. of the gas molecules

The K.E. of the centre of mass of the gas

The P.E. of the centre of mass of the gas

Total K.E. of the molecules w.r.t the centre of mass of gas

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

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

The internal energy of monoatomic gas is.

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3/2 RT

Independent of temperature

In the form of K.E.

Partially kinetic and partially potential

Which of the following is a clinical thermometer.

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Gas thermometer

Mercury thermometer

Alcohol thermometer

Radiation thermometer

How does heat transfer between objects.

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From cold to hot objects

From hot to cold objects

By electromagnetic radiations

From hotter to hottest objects.

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

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