thermodynamics MCQs – Page 8

Practise focused thermodynamics questions with marked answers for exam preparation and subject revision.

thermodynamics Mcqs
141. The same volume of all gases would represent their____________________?
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A. molecular weights

B. gas characteristic constants

C. densities

D. specific gravities

E. specific weights

142. The ratio of two specific heats of air is equal to____________________?
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A. 0.17

B. 0.24

C. 1.41

D. 2.71

E. 0.1

143. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are__________________?
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A. real functions

B. point functions

C. path functions

D. thermodynamic functions

E. cyclic functions

144. Boyles law i.e. pV = constant is applicable to gases under ___________________?
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A. steady change of pressures

B. only small range of pressures

C. all ranges of pressures

D. atmospheric conditions

E. high range of pressures

145. According to first law of thermodynamics__________________?
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A. total energy of a system remains constant

B. total internal energy of a system during a process remains constant

C. entropy of a system remains constant

D. internal energy, enthalpy and entropy during a process remain constant

E. work done by a system is equal to heat transferred by the system

146. For reversible adiabatic process, change in entropy is_________________?
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A. negative.

B. zero

C. minimum

D. unpredictable

E. maximum

147. Reversed joule cycle is called_________________?
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A. Dual cycle

B. Carnot cycle

C. Brayton cycle

D. Rankine cycle

E. Bell Coleman cycle

148. The statement that molecular weights of all gases occupy the same volume is known as________________?
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A. Daltons law

B. Law of thermodynamics

C. Avogadros hypothesis

D. Joules law

E. Gas law

149. Carnot cycle efficiency is maximum when______________?
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A. initial temperature is 0K

B. final temperature is 0K

C. final temperature is 0C

D. initial temperature is minimum possible

E. difference between initial and final temperature is 0K

150. The pressureof a gas in terms of its mean kinetic energy per unit volume E is equal to________________?
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A. 3E/4

B. 2E/3

C. E/2

D. 5E/4

E. E/3