Question # 1

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

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

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Pressure

Temperature

Liquids

Fluids

The process is which volume of the system remains constant.

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Isobaric process

Isochoric process

Isothermal process

Adiatatic process

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

Which of the following has negative specific heat

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Ne

CO2

O2

Sturated vapours

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

Temperature of a system remains constant in

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Adiabatic process

Isobaric process

Isothermal process

Isochoric process

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

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

Difference between Cp and Cv is equal to

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General gas constant

Planck's conatant

Molar gas constant

Boltzmann's constant

In four stroke cycle the crank makes

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One complete revolution

Two complete revolutions

three complete revolutions

Four complete reveolutions

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

The ratio of specific heat capacity to motor heat capacity of a body

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Is a universals cantante

Depends upon the mass of the body

Depends upon the molecular weight of the body

Is dimensionless

Identify the irreversible process

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Explosion of a bomb

Slow expansion of a gas

Slow compression of a gas

Slow compression of an eleastic spring

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

Which of the following gases has the maximum rms speed at STP.

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O2

H2

N2

CO2

Significant motion for the molecules of a monoatomic gas is.

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Rotatory

Vibratory

Translatory

Random

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

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Entropy

Enthalpy

Randomness

Chaos theory

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PPSC Physics Chapter 3 Thermal Properties of Matter MCQs With Answers

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