Mechanical Engineering MCQs

Page No. 100

According to kinetic theory of gases, the absolute zero temperature is attained when___________________?


avolume of the gas is zero

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bpressure of the gas is zero

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ckinetic energy of the molecules is zero

✓


dspecific heat of gas is zero

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No liquid can exist as liquid at____________________?


a– 273 °K

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bvacuum

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czero pressure

✓


dcentre of earth

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View Answer zero pressure

The pressure’of a gas in terms of its mean kinetic energy per unit volume E is equal to________________?


aE/3

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bE/2

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c3E/4

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d2E/3

✓


View Answer 2E/3

Superheated vapour behaves___________________?


aexactly as gas

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bas steam

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cas ordinary vapour

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dapproximately as a gas

✓



Intensive property of a system is one whose value____________________?


adepends on the mass of the system, like volume

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bdoes not depend on the mass of the system, like temperature, pressure, etc

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cis not dependent on the path followed but on the state

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dis dependent on the path followed and not on the state

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Characteristic gas constant of a gas is equal to______________________?


aC/Cv

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bCv/Cp

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cCp – Cv

✓


dCp + Cv

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View Answer Cp – Cv

The ratio of two specific heats of air is equal to____________________?


a0.17

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b0.24

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c0.1

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d1.41

✓


View Answer 1.41

Which law states that the internal energy of a gas is a function of temperature__________________?


aCharles’ law

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bJoule’s law

✓


cRegnault’s law

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dBoyle’s law

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View Answer Joule’s law

Which law states that the specific heat of a gas remains constant at all temperatures and pressures______________________?


aCharles’ Law

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b Joule’s Law

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cRegnault’s Law

✓


dBoyle’s Law

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View Answer Regnault’s Law

An open system is one in which____________________?


amass does not cross boundaries of the system, though energy may do so

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bneither mass nor energy crosses the boundaries of the system

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cboth energy and mass cross the boundaries of the system

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dmass crosses the boundary but not the energy

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