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Q.

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

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a

40 J

b

100 J

c

80 J

d

20 J

answer is D.

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Detailed Solution

 ACB                                     ADB
dQ=du+dw           dQ=30+10
dQ=30J                    =40J
                
 

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