An iron rod is heated. Which of the following statement about it 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, in this case, is reserved.

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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 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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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. When an iron rod is heated in a furnace, the colour of the iron rod first turns dull red and on further increase in temperature it changes to bright red to orange, then yellow, progressively white and then finally blue at the elevated temperatures.
This sequence of colours observed on heating an iron rod are in the sequence of __________

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

Q. A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from

0^{\circ} C

100^{\circ} C

. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal A has the length :

Q. If a metal rod is uniformly heated, its ____ will not change.

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An iron rod is heated. Which of the following statement about it is incorrect?

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 volume. On cooling, the iron rod contracts and regains its original size. The changes that occur on expansion and contraction are reversible.

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 volume. On cooling, the iron rod contracts and regains its original size. The changes that occur on expansion and contraction are reversible.