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Question

A change in the physical state can be brought about:
  1. without any energy change
  2. only when energy is taken out from the system
  3. only when energy is given to the system
  4. when energy is either given to, or taken out from the system

A
without any energy change
B
only when energy is given to the system
C
only when energy is taken out from the system
D
when energy is either given to, or taken out from the system
Solution
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A change in a physical state can be brought about when energy is either given to or taken out from the system.
For example, if we give energy or heat to ice, it will convert to liquid water similarly if we took out the energy (or cool it) from the water it will convert back to ice.

Therefore, the correct option is (C).

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