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Question (1)

QN0038436

Which of the following processes is reversible?

(A)
Transfer of heat by conduction
(B)
Transfer of heat by radiation
(C)
Isothermal compression
(D)
Electrical heating of a nichrome wire

Correct Answer: C

Explanation:

For process to be reversible it must be quasi-static. For quasi static process all changes take place infinitely slowly. Isothermal process occur very slowly so it is quasistatic and hence it is reversible.

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Question (2)

QN0038437

Which of the following processes is irreversible?

(A)
Transfer of heat by radiation
(B)
Adiabatic changes performed slowly
(C)
Extremely slow extension of a spring
(D)
Isothermal changes performed slowly

Correct Answer: A

Explanation:

Slow isothermal expansion or compression of an ideal gas is reversible process, while the other given processes are irreversible in nature.

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