An iron rod is heated. Which of the following statements is incorrect?

The rod expands.

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The rod almost comes to the same size on cooling.

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The change is reversed.

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

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Solution

The correct option is D
The rod changes its shape and the change cannot be reversed.

When an iron rod is heated, it expands with an increase in its overall size and volume. On cooling, the iron rod contracts and regains its original size. The changes that occur on expansion and contraction are reversible.

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Similar questions

Question 3

An iron ring is heated. Which of the following statement 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

Q. Give an example in the given case:
(a) Change which occurs on heating but can be reversed.
(b) Change that occurs on heating but cannot be reversed.
(c) Change occurs on cooling but can be reversed.
(d) Change occurs on mixing two substances but can be reversed.
(e) Change which occurs on mixing two substances, but cannot be reversed.

Question 15

Give one example in each case.
Change which occurs on heating but can be reversed.
Change which occurs on heating but cannot be reversed.
Change which occurs on cooling but can be reversed.
Change which occurs on mixing two substances but can be reversed.
Change which occurs on mixing two substances but cannot be reversed.

One rod of copper and another identical rod of iron are heated to the same rise in temperature. Which rod will expand more? Give reason.

Q. Iron rod turns red on heating. What kind of change is this?

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