CBSE Science Class 8

Combustion and Flame

Combustion and Flame - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Very Short Q&A:

Q1: Give example of some of the fuel used in our day to day life.
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Q2: Define combustion
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Q3: Define combustible
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Q4: The fuel may be solid , liquid or _______________
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Q5: Which of the following is not a combustible substance
  1. Wood
  2. Petrol
  3. Nail
  4. All of them
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Q6: Sometimes light is also given out during ______________
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Q7: Air is required for combustion or not?
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Q8: Which fuels are used for running automobiles?
  1. Wood
  2. Coal
  3. Diesel
  4. Charcoal
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Q9: Combustion is a reaction in which a Substance reacts with
  1. Hydrogen
  2. Nitrogen
  3. Oxygen
  4. Chlorine
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Q10: What is ignition temperature?
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Q11: Different substances catch fire at different ________________________
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Q12: Can a matchstick catch fire on its own on room temperature?
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Q13: Name the substances by which head of the matchsticks are made of?
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Q14: Name the substances by which the rubbing surface of matchsticks are made of?
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Q15: A combustible substance cannot catch fire or burn as long as its temperature is lower than its ______________________.
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Q16: What do you mean by inflammable substances?
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Q17: Give examples of inflammable substances.
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Q18: List the three essential requirements for producing fire.
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Q19: The job of fire extinguisher is to cut of the supply of______________________.
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Q20: Which of the following are inflammable Substances?
  1. Petrol
  2. Wood
  3. Paper
  4. Straw
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Q21: Give example of rapid combustion.
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Q22: Cracker is example of__________________________ combustion.
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Q23: Which is the hottest part of a flame?
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Q24: Good fuel is which is
  1. Cheap
  2. readily available
  3. produces large amount of heat
  4. All of these
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Q25: Give examples of some gaseous fuel.
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Q26: Which of these fuels will produce large amount of heat LPG, coal or wood?
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Q27: The unit of calorific value is ____________________.
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Q28: Incomplete combustion of these fuels releases __________________________ gas.
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Q29: What is acid rain?
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Q30: What is calorific value?
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Q31: Fire produced by oil cannot be controlled by________________________.
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Q32: When a cracker is ignited a sudden reaction takes place with the evolution of heat, light and sound, this is an example of what type of combustion?
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Q33: Fuel must be heated to its_________________ before it starts burning.
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Q34: Name a liquid fuel used in our home.
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Q35: Name the gases involved in acid rain.
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Q36: Name the modern fuel replacing diesel and petrol in automobiles
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Chapter 6 Combustion and Flame