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
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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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
(a), (b), (d) When the rod is hammered the external work is done on the rod which increases its temperature.
Heat is transferred to the gas in the small container by big reservoir at temperature T2
As the weight is added to the cylinder arrangement in the form of external pressure so it cannot reversed.
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From A to B the process is isobaric
= W = 2 × R (600 - 350)
= 500 R
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