Question

The internal energy of a system could be changed
(a) by extracting heat from the system
(b) by doing work done on the system
(c) if system do some work on the surroundings
(d) all of the above​

Answer 1

Answer:

By heating or cooling the system and keeping volume constant, the internal energy of the system increases or decreases respectively.

Answer 2

Answer:

By heating or cooling the system and keeping volume constant, the internal energy of the system increases or decreases respectively.