Question

A …………is an example of wheel and axle.

Answer 1

1. Wheel and axle essentially consist of two cylinders of different diameters joined together, such that if one is made to rotate the other also rotates.
2. The cylinder with a bigger diameter is called a wheel, whereas the one smaller diameter is called an axle.
3. Ex: water tap, the doorknob, etc.

Hence, A doorknob is an example of a wheel and axle.