Thermodynamics

JEE Main level, single correct, medium

149 of 190

Question 149 of 190

A gas can be taken from AA to BB via two different processes ACBACB and ADBADB.



When path
ACBACB is used 60J60J of heat flows into the system and 30J30J of work is done by the system. If the path ADBADB is used then work done by the system is 10J10J, the heat flows into the system in the path ADBADB is:

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Answer: (C) 40J40J

For path ACBACB,

ΔQ=ΔU+ΔW\Delta Q=\Delta U+\Delta W

60=ΔU+3060=\Delta U+30

⇒ΔU=30J\Rightarrow \Delta U=30J

For path
ADBADB

ΔQ=ΔU+ΔW\Delta Q=\Delta U+\Delta W

As initial and find points are the same, change in internal energy is same in both the cases


ΔQ=30+10\Delta Q=30+10

=40J=40J

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