An enclosed ideal gas is taken through a cycle as shown in the figure. Then
  • AAlong $AB$, temperature decreases while along $BC$ temperature increases
  • BAlong $AB$, temperature increases while along $BC$ the temperature decreases.
  • CAlong $CA$ work is done by the gas and the internal energy remains constant.
  • DAlong $CA$ work is done on the gas and internal energy of the gas increases.
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