CBSE  /  Class 8  /  Science  /  Combustion and Flame

  • 1. 
    Out of these, which is able to control fires?

  • NH3
  • H2
  • CO2
  • F2

  • 2. 
    Which zone of a flame does a goldsmith use for melting gold and silver ?

  • Outer zone
  • Middle zone
  • Inner zone
  • Lower zone

  • 3. 
    Calorific value of a fuel is expressed in

  • kilojoule per kilogram
  • kilojoule per gram
  • joule per milligram
  • kilojoule per milligram

  • 4. 
    Which is non-combustible substance?

  • Wood
  • Paper
  • Iron nails
  • Straw

  • 5. 
    Acid rain contains mainly

  • oxygen and nitrogen gas
  • fluorine and chlorine gas
  • magnesium oxide
  • nitrogen oxide and sulphur dioxide
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