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When no heat is absorbed by the system t...

When no heat is absorbed by the system them from the surroundings, but work `(w)` is done on the system, the change in internal energy of the system is given as

A

`Delta U = q + w`

B

`Delta U = q - w`

C

`Delta U = - q`

D

`Delta U = w_(ad)`

Text Solution

Verified by Experts

The correct Answer is:
D
Wall of the system is adiabatic as `q = 0`. Options (2) is valid when `w` amount of work is done by the system and `q` amount of heat is supplied to the system. Compression work is possible only in closed system. Option (3) is valid when no work is done on the system, but `q` amount of heat is taken out from that system and given to the surroundings Thus, the system has thermally conducting wall.
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