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NEET
Exam
NEET
Subject
Physics
Chapter
Thermodynamics

NEET · Physics · Thermodynamics

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

A gas can be taken from AA to BB via two different processes ACBACB and ADBADB.
A gas can be taken from A to B via two different processes ACB and ADB . When path ACB is used 60J of heat flows into
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:

Options

  1. A100J100J
  2. B20J20J
  3. C40J40J
  4. D80J80J

Correct answer

C. 40J40J

Step-by-step solution

For path ACBACB,
ΔQ=ΔU+ΔW\Delta Q = \Delta U + \Delta W
60=ΔU+3060 = \Delta U + 30
⇒ΔU=30J⇒ \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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