Question

Metal rim is fixed to wooden wheel by

1) heating metal rim
2) heating wooden wheel
3)cooling metal rim
4) cooling wooden wheel
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Answer 1

Explanation:

For fixing the metal rim on a wooden wheel of a cart, the metal rim is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim, which contracts and fits tightly onto the wheel.