For one complete cycle of a thermodynamic processes on a gas as shown in $P-V$ diagram. Which is true
  • A$\Delta U = 0\,;\,Q < 0$
  • B$\Delta U > 0;\,Q < 0$
  • C$\Delta U = 0;\,Q > 0$
  • D$\Delta U < 0;\,Q > 0$
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