One mole of a diatomic ideal gas undergoes a cyclic process $ABC$ as shown in figure. The process $BC$ is adiabatic. The temperatures at $A, B$ and $C$ are $400\ K, 800\ K $ and $600\ K$ respectively. Choose the correct statement
  • AThe change in internal energy in the process $CA$ is $700\ R$
  • BThe change in internal energy in the process $AB$ is $ -350R$
  • CThe change in internal energy in the process $BC$ is $-500R$ 
  • DThe change in internal energy in whole cyclic process is $250R $ 
JEE MAIN 2014, Easy
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