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Question

The 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

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B

contracts and fits onto the wooden wheel

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C

no change in the size takes place

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D

expands first, then on cooling contracts and fits onto the wooden wheel.

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Solution

The correct option is D

expands first, then on cooling contracts and fits onto the wooden wheel.


Explanation for correct option:

(d) expands first, then on cooling contracts and fits onto the wooden wheel

  • The tyre is created significantly smaller in diameter than the wheel. The tyre is then mounted on the wheel after being heated, which causes it to expand.
  • The tyre compresses as it cools, creating a snug fit on the wheel.
  • Hence this is the correct option.

Explanation for incorrect options:

(a) expands and fits onto the wooden wheel

  • The tyre does not compress here, thus not creating a snug fit on the wheel
  • Hence this is the correct option.

(b) contracts and fits onto the wooden wheel

  • On heating the tyre expands to ensure a snug fit.
  • Hence this is the correct option.

(c) No change in the size takes place

  • The tyre will expand on heating and contract on cooling.
  • Hence this is the correct option.

Hence, the correct option is (d) expands first, then on cooling contracts and fits onto the wooden wheel.


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