Question # 1

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 absolute temperature of the tripple point of water is

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100°C

4°C

373 K

273.16 K

Pressure may be define as _______ per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

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

Brownian motion increases due to

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Increase in size of Brownian particle

Increase in temperature of medium

Increase in density of medium

Increase in viscosity of medium

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

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

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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1 : 2

2 : 3

3 : 4

8 : 9

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

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

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

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Zero

Max

Min

-ve

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

In a heat engine, heat is supplied by the

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cold reservoir

sink

hot reservoir

none of them

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ECAT Physics Chapter 11 Heat & Thermodynamics Online Test MCQs With Answers

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