A change in the physical state can be brought about
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) when energy is either given to or taken out from the system
(d) without any energy change

Correct Answer: (c) when energy is either given to or taken out from the system

Explanation: A change in the physical state can be brought about when energy is either given to or taken out from the system.