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Question
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
Options
expands and fits onto the wooden wheel
contracts and fits onto the wooden wheel
contracts and fits onto the wooden wheel
expands first, then on cooling contracts and fits onto the wooden wheel.
Solution
expands first, then on cooling contracts and fits onto the wooden wheel.
Explanation -
The smaller iron rim expands on heating fits into the wooden wheel and on cooling contracts to fit into the wooden wheel tightly hence does not come out.
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