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QJEEM19Phbaff: JEE Main 2019 Physics - Class 11 JEEM19Phbaff Solution: A gas can be taken from A to B via two different processes ACB…

A gas can be taken from A to B via two different processes ACB and ADB.

JEE Main 2019 (Online) 9th January Morning Slot Physics - Heat and Thermodynamics Question 340 English
When path ACB is used 60 J of heat flows into the system and 30 J of work is done by the system. If path ADB is used work done by the system is 10 J. The heat Flow into the system in path ADB is :

Multiple Choice Options

  • A 20 J
  • B 40 J
  • C 80 J
  • D 100 J

Step-by-Step Verified Solution

Using law of thermodynamics in path ACB,

Δ\Delta QACB = Δ\Delta UACB + Δ\Delta WACB

⇒\Rightarrow    60 = Δ\Delta UACB + 30

⇒\Rightarrow     Δ\Delta UACB = 30 J

As value of Δ\Delta U is path independent,

∴\therefore     Δ\Delta UACB = Δ\Delta UADB = 30 J

∴\therefore    In path ADB,

Δ\Delta QADB = Δ\Delta UADB + Δ\Delta WADB

⇒\Rightarrow Δ\Delta QADB = 30 + 10 = 40 J

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