Physics-
General
Easy
Question
What is the nature of change in internal energy in the following three thermodynamical processes shown in figure?
is positive in all the three cases
- is negative in all the three cases
- is positive for (i), negative for (ii), zero for (iii)
, in all the cases
is positive in all the three cases
is negative in all the three cases
is positive for (i), negative for (ii), zero for (iii)
, in all the cases
The correct answer is: , in all the cases
As indicator diagram if all the three cases are closed curves, representing cyclic changes, therefore, 
const and in all the cases
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