Question # 1

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

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

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 internal energy of an isolated system

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Is zero

Keeps on changing

Remains constant

Cannot be judged

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

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480 calories

720 calories

940 calories

1170 calories

What is the SI unit for thermal conductivity.

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W m-1 K-1

W m-2 k-2

W m-3 k-1

J kg -1 k-1

What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1

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0.4 kj

0.8 kj

400 kj

800 kj

First law of thermodynamics is a

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Boyle 's law

Charles' law

Law of energy conservation

Steffen Boltzmann law

Which of the following measures how quickly the thermometer liquid mainly because it

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Is coloriess

Is a bad conductor of heat

Does not expand linearly

Has a low boiling point

The gas thermometer is taken as the primary standard because.

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Thermometers are easily reproducible

Readings can be accurately taken

No correction are necessary

It produces he thermodynamic scale

For which process is the relation Delta Q = Delta V true.

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Isothermal

Adiabatic

isobaric

Isochoric

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

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

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Equal to the input temperature

Less than the input temperature

0 ^oC

0 K

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

Why an even Carnot engine Carnot give 100% efficiency.

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We cannot find ideal sources

We cannot eliminate friction

We cannot reach absolute zero temperature

We cannot remove heat

No entropy change is associated with

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Isothermal process

Adiabatic process

Isochoric process

Isoteric process

Gas law PV = constant is for

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Adiabatic change

Isothermal changes

Isobaric changes

Isochoric changes

Which quantity provides a quantitative measure of disorder.

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Entropy

Enthalpy

Randomness

Chaos

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

Gases exert pressure on walls of the vessels because gas molecules.

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Possess momentum

Have finite volume

Collide with each other

Obey gas laws

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