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  • 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

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

Answers (1)

Answer: C

Solution.

A change in the physical state can be brought about when energy is either given to, or taken out from the system. When a solid change into liquid, it absorbs energy. It is because, energy change helps in changing the magnitude of attraction forces between the particles, thus helps in changing the physical states (i.e., solid, liquid, gas) of matter. When a liquid change into solid, it releases energy.

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