Here, we have mentioned some important multiple choice questions
based on thermodynamics, if want to learn thermodynamics this collection of
MCQs will help you, read this and recall it properly.
Thermodynamics MCQs with Answers
A. Kinetic Energy
A. Less than or more than
A. Mass entering = mass leaving
A. Irreversible
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| Thermodynamics |
Thermodynamics MCQs with Answers
GK- General Science
1. Which of the following is mostly neglected while doing
calculations for finding maximum work?
A. Kinetic Energy
B. Potential Energy
C. Both of the mentioned
D. None of the mentioned
Answer Option C
Explanation: The changes in kinetic
energy and are potential energy very small, hence they are neglected.
2. The work is done by a closed system
in a reversible process is always ___ that done in an irreversible process.
A. Less than or more than
B. Equal to
C. Less than
D. More than
Answer Option D
Explanation: A reversible process always produces maximum work.
3. Work was done in all reversible
processes is equal.
A. True
B False
C. Maybe true
D. Maybe false
Answer Option A
Explanation: Reversible
processes between the same end states must coincide and produce equal amounts
of work.
4. Which of the following is true
for a steady flow system?
A. Mass entering = mass leaving
B. Mass does not enter or
leave the system
C. Mass entering can be more
or less than the mass leaving
D None of the mentioned
Answer Option A
Explanation: For a steady
flow process, mass entering the system is equal to the mass leaving the system.
5. In an open system, for maximum
work, the process must be entirely
A. Irreversible
B. Reversible
C. Adiabatic
D. None of the mentioned
Answer Option B
Explanation: A reversible process gives the maximum work.
6. The proof that works done in all
reversible processes is the same can be done by violating the Kelvin-Planck
statement.
A. True
B. False
C. Maybe true
D. Maybe false
Answer Option A
Explanation: During the
proof, we end up violating the Kelvin-Planck statement.
7. Which of the following is the correct sentence for a closed system?
A. Mass entering = mass
leaving
B. Mass does not enter or
leave the system
C. Mass entering can be more
or less than the mass leaving
D None of the mentioned
Answer Option B
Explanation: For a closed
system mass does not change.
8. For a process from state 1 to
state 2, heat transfer in a reversible process is given by
A. Q for
reversible=T(S1-S2)
B. Q for
reversible=T(S2-S1)
C. Q for
reversible=T/(S1-S2)
D. Q for
reversible=T/(S2-S1)
Answer Option B
Explanation: T is the temperature of the surroundings and S1, S2 are the entropies at state 1 and 2
respectively and ΔS(universe)=0.
9. Which of the following is true?
A. Q for
reversible < Q for irreversible and work for reversible < work for
irreversible
B. Q for reversible
< Q for irreversible and work for reversible > work for irreversible
C. Q for reversible
> Q for irreversible and work for reversible < work for irreversible
D. Q for reversible
> Q for irreversible and work for reversible > work for irreversible
Answer Option: D
Explanation: This is because
of Q for reversible=T(S2-S1) and Q for irreversible<T(S1-S2).
10. A piston-cylinder contains air at 600 kPa, 290 K and a volume of 0.01m^3. A
constant pressure process gives 54 kJ of work out. Find the final volume of the
air.
A. 0.05 m^3
B. 0.01 m^3
C. 0.10 m^3
D. 0.15 m^3
Answer Option C
Explanation: W = ∫ P dV = PΔV
ΔV = W/P = 54/600 = 0.09 m^3
V2 = V1 + ΔV = 0.01 + 0.09 =
0.1 m^3.