CBSE  /  Class 8  /  Science  /  Materials: Metals and Non-Metals

  • 1. 
    The best electrical conductor is

  • gold
  • copper
  • silver
  • aluminium

  • 2. 
    Iron is galvanised by coating it with

  • chromium
  • sodium
  • magnesium
  • zinc

  • 3. 
    Out of these, which one is more reactive with water?

  • Sodium
  • Magnesium
  • Iron
  • Copper

  • 4. 
    Boron is

  • metal
  • metalloid
  • non-metal
  • alkali

  • 5. 
    A mineral from which. a metal can be extracted on the commercial scale, economically is called

  • ore
  • metalloid
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