For a reversible process,the necessary condition is:

  • A
    In the whole cycle of the system,the loss of any type of heat energy should be zero.
  • B
    The process should be very fast.
  • C
    The process should be slow so that the working substance remains in thermal and mechanical equilibrium with the surroundings.
  • D
    The loss of energy should be zero and it should be quasistatic.

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$A$ thermally insulated container is divided into two parts by a screen. In one part,an ideal gas is filled at pressure $P$ and temperature $T$. The second part is a vacuum. If a small hole is now created in the screen,the temperature of the gas will:

Write a short note on reversible and irreversible processes.

Two cylinders $A$ and $B$ of equal capacity are connected to each other via a stopcock. $A$ contains a gas at standard temperature and pressure. $B$ is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following :
$(a)$ What is the final pressure of the gas in $A$ and $B$?
$(b)$ What is the change in internal energy of the gas?
$(c)$ What is the change in the temperature of the gas?
$(d)$ Do the intermediate states of the system (before settling to the final equilibrium state) lie on its $P-V-T$ surface?

$Assertion :$ Thermodynamic processes in nature are irreversible.
$Reason :$ Dissipative effects cannot be eliminated.

Is the rusting of iron a reversible process? Why?

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