Question

The reversible process among the following
processes
Movement of a particle on a frictionless
track
Passage of current through a
resistor
Passage of heat from water at 40°C to water at
20 °C
Expansion of a gas coming out of a
nozzle​

Answer 1

Once the gases reach the nozzle, they experience an adiabatic, reversible expansion process which is accompanied by a drop in temperature and pressure and a conversion of thermal energy into kinetic energy. Therefore expansion of gas coming out of nozzle is a reversible process.
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