Question

3. An iron ring is heated. Which of the following statements about it is incorrect?

• A. The ring expands
• B. The ring almost comes to the same size on cooling.
• C. The change in this case is reversed.
• D. The ring changes its shape and the change cannot be reversed.

Answer 1

The correct option is D

The ring changes its shape and the change cannot be reversed.

Explanation for correct option:

(D) When iron ring is heated, it expands its shape. After cooling, the ring contracts and get back to its shape. Therefore, it is a reversible change.

Explanation for correct options:

(A) When the iron ring is heated, it expands and become large in size.

(B) After cooling the heated ring, it will get back to the same original size by contraction.

(C) The heating of ring is a reversible change, as the size of the ring changes on heating and get back to the original state on cooling.

Hence, option (D) is correct that the incorrect statement is the ring changes its shape and the change cannot be reversed.