An iron ring is heated- Which of the following statements is incorrect for the given iron ring-The change occurring in this case is reversible-The ring expandsThe shape of the ring changes and the change is irreversibleThe ring comes to the same size upon cooling

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An iron ring ...

Question

An iron ring is heated. Which of the following statements is incorrect for the given iron ring?

The ring expands

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The ring comes to the same size upon cooling

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The change occurring in this case is reversible

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The shape of the ring changes and the change is irreversible

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Solution

The correct option is D The shape of the ring changes and the change is irreversible
As iron expands upon heating, when the ring is heated, the inner and the outer diameters of the ring change, thus expanding the ring. When heat is removed, it contracts back to its original size, regaining the original diameters approximately.

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