Q1
What are plastics made from?
APolymers
BOnly metal
COnly wood
DOnly cotton
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 17 · Topic 1
Man-made Materials
Man-made (synthetic) materials like plastics, synthetic fibres, and alloys are created by humans, offering unique properties for various use
Core concept
Plastics are synthetic materials made from polymers, valued for being lightweight, durable, and mouldable into various shapes.
How it works
Synthetic fibres like nylon, polyester, and rayon are man-made alternatives to natural fibres, often more durable and affordable.
Why it matters
Alloys are mixtures of metals (or metal with other elements) created to enhance properties like strength, like steel (iron and carbon).
Key detail
While man-made materials offer many benefits, their disposal poses environmental challenges, as many don't decompose naturally like plastics.
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• Plastics: synthetic, made from polymers.
• Lightweight, durable, mouldable.
• Synthetic fibres: nylon, polyester, rayon.
• Man-made alternatives to natural fibres.
• Alloys: metal mixtures for enhanced properties.
• Example: steel (iron + carbon).
• Man-made materials offer many benefits.
• Disposal poses environmental challenges (non-decomposing).