Question

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

• A. Contracts and fits to the wooden wheel
• B. Expands and fits to the wooden wheel
• C. First expands and then contracts, thus fitting to the wooden wheel
• D. Iron becomes lighter after heating

Answer 1

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 again contracts, thus fitting completely onto the wheel.