Which is not a sign of reversible change?

Change in state

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Change in appearance

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Change in property

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Change in size

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Solution

The correct option is C Change in property
Changes that can be undone or reversed are called reversible changes. Change in state for example melting of ice is a reversible change. Change in appearance for example stretching of a rubber band is again a reversible change. Change in size for example inflation of a balloon is also a reversible change.
But if the property of a material changes, for example burning of paper, then that change cannot be reversed and is thus irreversible.

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