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

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

When the system is supplied with energy, the solid-state transforms into a liquid. When heat energy is removed from a liquid, it transforms into a solid; for example, ice transforms into water, and the water transforms into water vapours when heat energy is given. When energy is reduced, water vapours or steam condense to water, and water freezes to ice.

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