Why is the iron tyre heated before fitting it on a wooden wheel?

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Solution

As we know that metal expands on heating and contracts on cooling. On heating iron tyre expands, so it is easily fitted on a wooden wheel. On cooling, the iron tyre contracts and gets tightly fitted on the wooden wheel. Due to this reason, an iron tyre is heated before fitting it on a wooden wheel.

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Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim
(a) expands and fits onto the wooden wheel
(b) contracts and fits onto the wooden wheel
(c) no change in the size take place
(d) expands first, then on cooling contracts and fits onto the wooden wheel

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