Question

Which of the following options list only simple machines?

• A. Wheel barrow, Screw
• B. Scissors, Wedge
• C. Stapler, Pulley
• D. Wheel and axle, Inclined plane

Answer 1

The correct option is D

Wheel and axle, Inclined plane

The six simple machines are listed below:
1. Lever
2. Pulley
3. Wheel and axle
4. Inclined plane
5. Wedge
6. Screw
Rest all are called complex or compound machines.
A stapler is a compound machine that is made up of two simple machines, wedge and lever.
A wheelbarrow is a compound machine that is made up of three simple machines, lever, wheel and axle and an inclined plane.
A pair of scissors is made up of two simple machines, lever and a wedge.