Q112 / 180 · NEET 2015 (Phase 1) · Physics

Figure below shows two paths that may be taken by a gas to go from a state A to a state C.
Figure
In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be:

  • A
    380 J
  • B
    500 J
  • Correct answer
    C
    460 J
  • D
    300 J

Solution

In cyclic process ABCA,

ΔUcyclic=0

Qcyclic=W

QAB+QBC+QCA=  Closed loop area

400+100+QCA=12×2×10-3×4×104

500-QAC=40

QAC=460 J

Hence, the correct answer is option: 'C'.

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