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Question

A change in the physical state can be brought about:


A

only when energy is given to the system

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B

only when energy is taken out from the system

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C

when energy is either given to or taken out from the system

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D

without any energy change

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Solution

The correct option is C

when energy is either given to or taken out from the system


Explanation:

  • When the system is supplied with energy, the system in a solid state transforms into a liquid.
  • When heat energy is removed from a liquid, it transforms into a solid. For example, ice is converted into water, and the water is converted into water vapors when heat energy is given.
  • When energy is reduced, water vapors or steam condense to water, and water freezes to ice.

Therefore, the correct option is (C). A change in the physical state can be brought about when energy is either given to or taken out from the system.


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