All questions of Materials that Join for Grade 1 Exam

Option A

Man-made material
Plastic is a man-made material, meaning it is not found in nature but is instead created by humans through chemical processes. Here are some key points to explain why plastic is considered a man-made material:

Composition:
Plastic is composed of synthetic polymers, which are large molecules made up of repeating units called monomers. These polymers are created through the combination of various chemicals derived from fossil fuels like oil and natural gas.

Manufacturing:
Plastic is manufactured in factories through processes like polymerization, extrusion, and molding. These processes involve heating and shaping the raw materials to create the desired plastic products.

Versatility:
One of the main advantages of plastic is its versatility, as it can be molded into different shapes and forms to serve a wide range of purposes. This adaptability is a result of the man-made nature of plastic.

Environmental impact:
The man-made nature of plastic also contributes to its environmental impact, as many types of plastic are not biodegradable and can persist in the environment for hundreds of years. This has led to concerns about plastic pollution and its effects on ecosystems and wildlife.
In conclusion, plastic is considered a man-made material because it is created by humans through chemical processes, as opposed to being a natural material like wood or cotton. Its composition, manufacturing processes, versatility, and environmental impact all reflect its status as a man-made material.