Class VIII

Which substance give heat and light after combustion
  1. Flame
  2. Fuel
  3. combustion
  4. None of these
When a piece of rock from space enters earth
  1. Destruction
  2. Induction
  3. Friction
  4. Internal reflection
Coal burns with
  1. Flame
  2. Only Glow
  3. Both flame and glow
  4. None of these
Burning of charcoal in a closed room will produce
  1. Carbon dioxide
  2. Nitrogen dioxide
  3. Carbon monoxide
  4. all of above
Within a living cell, food is burned to produce energy through :
  1. Addition of Carbon dioxide and water
  2. Combustion
  3. Gaseous exchange
  4. Respiration
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