# Thermodynamics most important multiple choice questions previously asked in ssc je, rrb je etc

Thermodynamics most important multiple choice questions for SSC JE, RRB JE, AE and all JE and AE exam. Mechanical JE previously asked questions of thermodynamics

1.1. Which of the following variables controls the physical properties of a perfect gas?

(a) pressure
(b) volume
(c) temperature
(d) all of the above✔️
(e) atomic mass.

1.2. Which of the following laws is applicable for the behaviour of a perfect gas?

(a) Boyle’s law
(b) Gay-Lussac law
(c) Charles’ law
(d) all of the above✔️

1.3. The unit of temperature in S.I. units is

(b) Celsius
(c) Fahrenheit
(d) Kelvin✔️

1.4. The unit of mass in S.I. units is

(a) kilogram✔️
(b) gram
(c) tonne
(d) quintal

1.5 Gas laws are applicable to

(a) gases as well as vapours
(b) gases alone and not to vapours✔️
(c) gases and steam
(d) gases and vapours under certain conditions

1.6 According to Dalton’s law, the total pressure of the mixture of gases is equal to

(a) greater of the partial pressures of all
(b) average of the partial pressures of all
(c) sum of the partial pressures of all ✔️
(d) sum of the partial pressures of all divided by
average molecular weight

1.7 Kinetic theory of gases assumes that the collisions between the molecules are

(a) perfectly elastic ✔️
(b) perfectly inelastic
(c) partly elastic
(d) partly inelastic

1.8 Characteristic gas constant of a gas is equal to

(a) Cp/Cv
(b) Cv/Cp
(d) Cp – Cv✔️
(e) Cp + Cv

1.9 The ratio of two specific heats of air is equal to

(a) 0.17
(b) 0.24
(c) 0.1
(d) 1.41✔️

1.10 Work done in a free expansion process is

(a) + ve
(b) – ve
(c) zero✔️
(d) maximum

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