Reversible and Irreversible Processes NEET Questions

Physics - Thermodynamics

Reversible and Irreversible Processes MCQ Questions


1.
A thermodynamic process is reversible if:
A.
Temperature remains constant throughout the process
B.
Both the system AND surroundings return to their original states with no other change anywhere in the universe
C.
The surroundings alone return to their initial state
D.
The system alone returns to its initial state after reversal
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ANSWER :
B. Both the system AND surroundings return to their original states with no other change anywhere in the universe
2.
An irreversible process is one that:
A.
Cannot be reversed to restore both the system and surroundings to their original states without any other effect
B.
Cannot be carried out at all in practice
C.
Requires no energy input
D.
Can be reversed by applying a large external force
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ANSWER :
A. Cannot be reversed to restore both the system and surroundings to their original states without any other effect
3.
The conditions required for a process to be reversible are:
A.
The process must occur at constant temperature
B.
The process must involve no heat exchange
C.
The process must be adiabatic
D.
The process must be quasi-static AND there must be no dissipative effects (friction, viscosity, etc.)
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ANSWER :
D. The process must be quasi-static AND there must be no dissipative effects (friction, viscosity, etc.)
4.
A quasi-static process is described in NCERT as:
A.
A process that happens infinitely fast
B.
A process where no heat is exchanged
C.
An infinitely slow process where at every stage the system remains in thermal and mechanical equilibrium with its surroundings
D.
A process occurring at constant pressure
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ANSWER :
C. An infinitely slow process where at every stage the system remains in thermal and mechanical equilibrium with its surroundings
5.
Which of the following is a correct example of a REVERSIBLE process given in NCERT?
A.
Heat transfer from a hot body to cold body across a finite temperature difference
B.
Combustion of petrol-air mixture
C.
Quasi-static isothermal expansion of an ideal gas in a cylinder with a frictionless movable piston
D.
Free expansion of gas into vacuum
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ANSWER :
C. Quasi-static isothermal expansion of an ideal gas in a cylinder with a frictionless movable piston
6.
NCERT states 'Irreversibility is a rule rather an exception in nature.' This means:
A.
Reversible processes are the most common in engineering
B.
Most natural processes are irreversible — dissipative effects cannot be completely eliminated
C.
Irreversible processes do not conserve energy
D.
All processes in nature are perfectly reversible
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ANSWER :
B. Most natural processes are irreversible — dissipative effects cannot be completely eliminated