The environmental impact of materials varies; for example, plastics contribute to pollution, while metals require mining and energy for production. Sustainable practices aim to reduce negative impacts and promote recycling and reuse.
Category: Class 6 Science
NCERT Solutions and Important Questions for class 6 Science for CBSE exams 2020-2021.
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Materials in technology provide essential properties like conductivity, strength, and flexibility. For example, semiconductors are used in electronics, while metals and polymers are used in various devices for their specific characteristics.
Materials are used in everyday life for various purposes, such as clothing (cotton, wool), housing (bricks, cement), and transportation (metal, plastic). They play a key role in making daily tasks and objects functional.
Opaque materials do not allow light to pass through them. This occurs because their internal structure scatters or absorbs light, preventing visibility through the material. Examples include wood, metal, and concrete.
Transparency is the property of a material that allows light to pass through it. Materials like glass, clear plastic, and some types of crystal are transparent, allowing us to see through them.