Question

A screwdriver belongs to category of simple machines.

• A. screw
• B. wedge
• C. wheel and axle
• D. none of these

Answer 1

The correct option is C

wheel and axle

Explanation for the correct option

Option C:

1. A screwdriver is an example of a wheel and axle arrangement.
2. The thick round handle of the screwdriver is the wheel and the thin, long metal rod is the axle.

Explanation for the incorrect options:

Option A:

1. A screw looks like a nail with grooves cut in it. It has a winding edge called a thread.
2. A screw increases force and because of the thread, it holds the wood more firmly than a nail.
3. A screw is actually an inclined plane wound around a rod.

Option B:

1. A wedge is a piece of wood or metal, that is narrow at one end and broad at the other. It is formed when two inclined planes are attached back to back.
2. Wedges are used for cutting, splitting, tightening or holding back, holding together, scraping, etc.

Option D:

1. Since the screwdriver belongs to the category of the wheel and axle arrangement, none of these cannot be the answer.
2. Thus, a screwdriver belongs to the category of wheel and axle arrangement.

Hence, option (C) is correct.