Question

Inclined plane is an example of:
A. Complex machine
B. Compound machine
C. Easy machine
D. Simple machine

Answer 1

Hint:Simple machine uses very less number of objects and has very few moving parts, while a complex machine is made up of more than two simple machines. There is no such type of machine called easy machine. Compound machines are made up of two simple machines. An inclined plane is an immovable object.

Complete answer:
Simple machine is a combination of objects which makes easy tasks which are in general very difficult to do using bare hands. Simple machine uses fewer numbers of objects and has almost all of its parts stationary or non moving. It is the simplest type of machine to use. Also, simple machines are easier to create, as fewer objects are needed to create it. Lever is an example of a simple machine. More of such examples of simple machines are pulley or a pair of scissors.

Compound machine is a machine created out of a combination of two simple machines. Compound machines can do more difficult work than that of a simple machine. Compound machine is more of a subset of a complex machine. Examples of compound machines are escalators and wheelbarrows. There is no such category of a machine which is known as an easy machine.

Complex machines are the machines which are made out of a combination of two or more simple machines. They are the hardest to be engineered, yet they can do tasks which might seem impossible to do with a simple machine. Examples of complex machines are bulldozer or crane. Here, the inclined plane has no moving parts and is a type of simple machine.

Hence option C is the correct answer.

Note: Complex machines are difficult to maintain and needs repairing more frequently as compared to simple and compound machines. This is because of the fact that there are more number of moving objects in such machines which can cause wear and tear due to friction as well as they get rusty quite easily.