Questions of Properties of Materials - Questions at the end of the chapter - Chapter 4 Class 7 - The World of Metals and Non-metals (Curiosity)

Last updated at April 25, 2026 by

Q1 (Easy): Which metal is commonly used to make food packaging materials as it is cheaper, and its thin sheets can be folded easily into any shape? (i) Aluminium (ii) Copper (iii) Iron (iv) Gold

Answer:
We have studied that malleability is the property by which metals can be beaten into thin sheets . This is why aluminium is used for packaging.

  • Aluminium is highly malleable and lightweight
  • It can be folded easily into any shape
  • It is cheaper than gold and copper
Aluminium for Packaging Malleable Can be beaten thin Lightweight Easy to handle Cheap Cost effective

Q4 (Medium): Why are only a few metals suitable for making jewellery?

Answer:
We have studied that metals have different properties like malleability , ductility , and sonority . This is why only specific metals work for jewellery.

  • Gold and silver are most malleable
  • They are non-reactive with air and water
  • They have attractive lustre and do not rust
  • Other metals like iron get rusted easily
Jewellery Metals vs Other Metals Property Jewellery Metals Other Metals Reactivity Non-reactive Reactive with air/water Appearance Lustrous always Lose lustre quickly Durability No rusting Rust formation Malleability Highly malleable Less malleable
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