Combustion and Flame MCQs with answers

Dear candidates you will find MCQ questions of 8th Class - Science | Chapter: Combustion and Flame here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
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Q. Which one of the following gases is used in combustion?
  • (A) Hydrogen
  • (B) Oxygen
  • (C) Nitrogen
  • (D) Carbon dioxide
💬 Discuss
✅ Correct Answer: (B) Oxygen
Q. The burning of LPG is an example of
  • (A) rapid combustion
  • (B) spontaneous combustion
  • (C) slow combustion
  • (D) explosion
💬 Discuss
✅ Correct Answer: (A) rapid combustion
Q. A temperature at which the substance burns is called
  • (A) melting
  • (B) boiling temperature
  • (C) kindling temperature
  • (D) evaporation
💬 Discuss
✅ Correct Answer: (C) kindling temperature
Q. Which is non-renewable source of energy’?
  • (A) Natural gas
  • (B) Wind energy
  • (C) Tidal energy
  • (D) Mechanical energy
💬 Discuss
✅ Correct Answer: (A) Natural gas
Q. Which of the following is not a fossil fuel?
  • (A) Coal
  • (B) Petroleum
  • (C) Natural gas
  • (D) Water gas
💬 Discuss
✅ Correct Answer: (D) Water gas
Q. Which gas helps in the process of combustion?
  • (A) Cooking gas
  • (B) Nitrogen gas
  • (C) Oxygen gas
  • (D) Producer gas
💬 Discuss
✅ Correct Answer: (C) Oxygen gas
Q. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
  • (A) calorific value
  • (B) significant value
  • (C) heat value
  • (D) internal energy
💬 Discuss
✅ Correct Answer: (A) calorific value
Q. Which zone represents the partial combustion in candle flame?
  • (A) Outer zone
  • (B) Middle zone
  • (C) Inner zone
  • (D) Lower zone
💬 Discuss
✅ Correct Answer: (B) Middle zone
Q. Burning coal in a closed room will produce
  • (A) nitrogen oxides
  • (B) carbon dioxide
  • (C) carbon monoxide
  • (D) oxygen
💬 Discuss
✅ Correct Answer: (C) carbon monoxide
Q. Substances which catch fire are called
  • (A) acids
  • (B) bases
  • (C) combustible
  • (D) burners
💬 Discuss
✅ Correct Answer: (C) combustible
Q. Out of these, which is able to control fires?
  • (A) NH3
  • (B) H2
  • (C) CO2
  • (D) F2
💬 Discuss
✅ Correct Answer: (C) CO2
Q. Which zone of a flame does a goldsmith use for melting gold and silver ?
  • (A) Outer zone
  • (B) Middle zone
  • (C) Inner zone
  • (D) Lower zone
💬 Discuss
✅ Correct Answer: (A) Outer zone
Q. Calorific value of a fuel is expressed in
  • (A) kilojoule per kilogram
  • (B) kilojoule per gram
  • (C) joule per milligram
  • (D) kilojoule per milligram
💬 Discuss
✅ Correct Answer: (A) kilojoule per kilogram
Q. Which is non-combustible substance?
  • (A) Wood
  • (B) Paper
  • (C) Iron nails
  • (D) Straw
💬 Discuss
✅ Correct Answer: (C) Iron nails
Q. Acid rain contains mainly
  • (A) oxygen and nitrogen gas
  • (B) fluorine and chlorine gas
  • (C) magnesium oxide
  • (D) nitrogen oxide and sulphur dioxide
💬 Discuss
✅ Correct Answer: (D) nitrogen oxide and sulphur dioxide
Q. True or false:
Food is a fuel for our body.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (A) True
Q. True or False:
Burning of charcoal produces flame with four distinct zones.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (B) False
Q. True or False:
The fuel can be only liquid in nature.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (B) False
Q. True or False:
Sun produces heat and light because of combustion.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (B) False
Q. True or False:
It is easy to burn a piece of wood through matchstick.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (B) False
Q. True or False:
Soda acid fire extinguisher contains sodium bicarbonate + dil. Sulphuric acid.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (A) True
Q. True or False:
The inner central dark zone of a candle flame is the hottest region.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (B) False
Q. True or False:
The principle of all fire-extinguisher is to cut off the air supply and to cool the burning substance below its ignition temperature.
  • (A) True
  • (B) False
  • (C) NA
  • (D) NA
💬 Discuss
✅ Correct Answer: (A) True

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Table of contents

  1. Which one of the following gases is used in combustion?
  2. The burning of LPG is an example of
  3. A temperature at which the substance burns is called
  4. Which is non-renewable source of energy’?
  5. Which of the following is not a fossil fuel?
  6. Which gas helps in the process of combustion?
  7. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
  8. Which zone represents the partial combustion in candle flame?
  9. Burning coal in a closed room will produce
  10. Substances which catch fire are called
  11. Out of these, which is able to control fires?
  12. Which zone of a flame does a goldsmith use for melting gold and silver ?
  13. Calorific value of a fuel is expressed in
  14. Which is non-combustible substance?
  15. Acid rain contains mainly
  16. True or false: Food is a fuel for our body.
  17. True or False: Burning of charcoal produces flame with four distinct zones.
  18. True or False: The fuel can be only liquid in nature.
  19. True or False: Sun produces heat and light because of combustion.
  20. True or False: It is easy to burn a piece of wood through matchstick.
  21. True or False: Soda acid fire extinguisher contains sodium bicarbonate + dil. Sulphuric acid.
  22. True or False: The inner central dark zone of a candle flame is the hottest region.
  23. True or False: The principle of all fire-extinguisher is to cut off the air supply and to cool the

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