In bullock carts, the iron rim is usually heated before fixing it to the wooden wheels, because on heating, the iron:

First expands and then contracts, thus fitting to the wooden wheel

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Contracts and fits to the wooden wheel

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Expands and fits to the wooden wheel

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First contracts and then expands, thus fitting to the wooden wheel

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Solution

The correct option is A 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.

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Question 7

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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In bullock carts, the iron rim is usually heated before fixing it to the wooden wheels, because on heating, the iron:

The correct option is A First expands and then contracts, thus fitting to the wooden wheelWhen 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.

The correct option is A 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.