KTGMedium
Question
In the following figures (1) to (4), variation of volume by change of pressure is shown. A gas is taken along the path ABCDA. The change in internal energy of the gas will be:
(1)
(2)
(3)
(4) 
(1)
(2) (3) (4) Options
A.positive in all cases from (1) to (4)
B.positive in cases (1), (2) and (3) but zero in case (4)
C.negative in cases (1), (2) and (3) but zero in case (4)
D.zero in all the four cases.
Solution
As ᐃU = nRᐃT For closed path
ᐃT = 0 ∴ ᐃU = 0.
ᐃT = 0 ∴ ᐃU = 0.
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