In bullock carts, the iron rim is usually heated before fixing it to the wooden wheels, because on heating, the iron:
A
Contracts and fits to the wooden wheel
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B
Expands and fits to the wooden wheel
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C
First expands and then contracts, thus fitting to the wooden wheel
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D
First contracts and then expands, thus fitting to the wooden wheel
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Solution
The correct option is C First expands and then contracts, thus fitting to the wooden wheel When the iron rim is heated, it expands. It is placed on the wooden wheel in its expanded state. When the temperature decreases, the rim contracts, thus fitting completely onto the wheel.