Which of the processes described below are irreversible ? a) The increase in temperature of an iron rod by hammering it b) A gas in a small container at a temperature T1 is brought in contact with a big reservoir at a higher temperature T2 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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only a, b are correct

only b, d are correct

only c, d are correct

a,b,d are correct

answer is D.

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Detailed Solution

For a process to be reversible, it should take place in infinite number of stepsOnly the Quasistatic isothermal expansion is reversible process.

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