CBSE  /  Class 8  /  Science  /  Combustion and Flame

  • 1. 
    A chemical process in which a substance reacts with oxygen to give off heat is called

  • 2. 
    Fuel may be

  • 3. 
    The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value.

  • 4. 
    The substances which have very low ignition temperature and can easily catch fire with a flame are called

  • Inflammable substances

  • 5. 
    When we heat water in a paper bowl over a candle, the paper does not catch fire because

  • 6. 
    When oil or petrol catches fire, water is not used to extinguish it because

  • 7. 
    In combustion

  • Both heat and light is produced

  • 8. 
    A person caught fire on clothes is wrapped with blanket because

  • 9. 
    Ignition temperature is

  • 10. 
    Explosion takes place because of

  • Release of large amount of gas under pressure due to sudden reaction
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