Question # 1

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

A gas thermometer is more sensitive than a mercury thermometer because the expansion of gas for 1 o/c rise in temperature is.

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Five times as much as mercury

Ten times as much as mercury

Twenty times as much as mercury

Hundred times as much as mercury

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

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

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Perfectly elastic

Perfectly inelastic

Partly elastic

Partly inelastic

The internal energy of an isolated system

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Is zero

Keeps on changing

Remains constant

Cannot be judged

Which of the following should not change in isothermal operation.

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Heat constant

Volume

Pressure

Temperature

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

The pressure of a gas is directly proportions to

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Mean velocity of the molecules

Mean square velocity of the molecules

Root mean square velocity of the molecules

Instantaneous velocity of the molecules

In order of a cyclic heat engine operating between two heat reservoirs to be as efficient as a Carnot engine. It must be.

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A gas engine

Adiabatic

Reversible

A refrigerator

From any substance the temperature and pressure at which the material can coexist in all three states in equilibrium is called.

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Critical point

Triple point

Initial point

Final point

Which of the following is standard scale of temperature

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Mercury scale

Platinum resistance scale

Gas scale

Alcohol scale

The expression PV/KT represents.

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Number of moles of the gas

Number of molecules in the gas

Total mass of the gas

Density of the gas

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

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

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

Convention is the transfer of thermal energy by means of currents in

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Pressure

Temperature

Liquids

Fluids

The ratio between the energy dissipated in some process and the heat that appears as a result is the

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Specific heat

Mechanical equivalent of heat

Kilocalories

Triple point

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

What is a measure of the total energy of a thermodynamics system.

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Entropy

Enthalpy

Randomness

Chaos theory

In four stroke cycle the crank makes

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One complete revolution

Two complete revolutions

three complete revolutions

Four complete reveolutions

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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