Q 1836178972.     Which of the processes described below are irreversible?

NCERT Exemplar 11/07/MCQ

(This question may have multiple correct answers)

A The increase in temperature of an iron rod by hammering it
B A gas in a small container at a temperature`T_1` is brought in contact with a big reservoir at a higher temperature `T_2` which increases the temperature of the gas
C A quasi-static isothermal expansion of an ideal gas in cylinder fitted with a frictionless piston
D An ideal gas is enclosed in a piston cylinder arrangement with adiabatic walls. A weight w is added to the piston, resulting in compression of gas

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