Q1
Glass is used for windows mainly because it is:
Atransparent
Bmagnetic
Cflexible
Da poor conductor
CBSEClass 6 (CBSE)ScienceCh 6 · Topic 3
Materials and Their Uses
Understanding how a material's properties determine its everyday use.
Core concept
Engineers and designers must carefully consider multiple properties when selecting materials — for example, a cooking pot needs a material that conducts heat well (like aluminium or steel) but its handle needs a material that does NOT conduct heat well (like plastic or wood), to prevent burns. Similarly, a raincoat is made from waterproof material to keep the wearer dry, while a bandage is made from breathable but absorbent material to allow healing while still absorbing moisture.
Exam highlight
Key diagram
- Show objects (tyre, window, spoon) matched to the material property that makes them suitable.
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Quick notes
• Rubber is used for tyres due to its flexibility and grip.
• Glass is used for windows due to its transparency.
• Metals are used for cooking utensils due to good heat conductivity.
• Objects often combine materials with different properties for different parts (e.g., a metal pot with a plastic handle).