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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
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.
  • ✓
    When energy is either given to, or taken out from the system.
  • D
    Without any energy change.
✓

Answer

Correct option: C.
When energy is either given to, or taken out from the system.
When a solid changes into liquid, it absorbs energy. When a liquid changes into solid, it releases energy.

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