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Free download in PDF Thermodynamics Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, AIIMS etc. These short solved questions or quizzes are provided by Gkseries.
61
Universal gas constant is defined as equal to product of the molecular weight of the gas and
[A]
specific heat at constant pressure
[B]
specific heat at constant volume
[C]
ratio of two specific heats
[D]
gas constant
62
The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is
[A]
29.27 J/kmol°K
[B]
83.14J/kmol°K
[C]
848J/kmol°K
[D]
All J/kmol °K
63
In a free expansion process
[A]
work done is zero
[B]
heat transfer is zero
[C]
both (a) and (b) above
[D]
work done is zero but heat increases
Answer: both (a) and (b) above
64
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called
[A]
free expansion
[B]
hyperbolic expansion
[C]
adiabatic expansion
[D]
parabolic expansion
65
Which of the following processes is irreversible process
[A]
isothermal
[B]
adiabatic
[C]
throttling
[D]
all of the above
66
For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
[A]
zero
[B]
minimum
[C]
maximum
[D]
infinity
67
Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be
[A]
4.17m3/kgmol
[B]
400 m3/kg mol
[C]
0.15 m3/kg mol
[D]
41.7 m3/kg mol
68
The more effective way of increasing efficiency of Carnot engine is to
(a)
(b)
(c)
(d)
(e) keep lower temperature constant.
Ans: d
[A]
increase higher temperature
[B]
decrease higher temperature
[C]
increase lower temperature
[D]
decrease lower temperature
Answer: decrease lower temperature
69
Entropy change depends on
[A]
heat transfer
[B]
mass transfer
[C]
change of temperature
[D]
thermodynamic state
70
According to first law of thermodynamics
[A]
work done by a system is equal to heat transferred by the system
[B]
total internal energy of a system during a process remains constant
[C]
internal energy, enthalpy and entropy during a process remain constant
[D]
total energy of a system remains constant
Answer: total energy of a system remains constant
71
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
[A]
zeroth low of thermodynamic
[B]
first law of thermodynamics
[C]
second law to thermodynamics
[D]
basic law of thermodynamics
Answer: first law of thermodynamics
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