Which of the following rods will expand more, on being heated to the same rise in temperature; the initial length of each being same.

iron rod

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Copper rod

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Glass rod

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Aluminium rod

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Solution

The correct option is D
Aluminium rod

Aluminium rod will show maximum expansion because the co-efficient of linear expansion is maximum for aluminium (24 x 10^-6 per ^oC).

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