Question:-
The heat transfer Q, the work done w and the change in internal energy U are all zero in the case of
Option (A)
a rigid vessel containing steam at 150°C left in the atmosphere which is at 25°C
Option (B)
1 kg of gas contained in an insulated cylinder expanding as the piston moves slowly outwards
Option(C)
A rigid vessel containing ammonia gas connected through a value to an evacuated rigid vessel the value and the connecting pipes being well insulated and after a time condition through the two vessel becoming uniform
Option(D)
1 kg of air flowing adiabatically from the atmosphere into a previously evacuated bottle
Correct Option:
(C)
Question Solution:
This is the case of free expansion in insulated vessel
dQ = 0 and dW = 0
dQ = dU+ dW
0 = dU + 0
\ dU = 0
question-answer-faq-2802