This quiz works best with JavaScript enabled. Home > Cbse > Class 8 > Science > Combustion And Flame > Class 8 Science Chapter 6 Combustion And Flame – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 8 Science Chapter 6 Combustion And Flame Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Inflammable substances have very low calorific value. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 2. What are the conditions for combution A) Fuel/combustible substance. B) Axygen. C) Heat. D) All of the above. Show Answer Correct Answer: D) All of the above. 3. A chemical process in which a substance reacts with oxygen to give heat is called explosion. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 4. Which of the following is the hottest zone of the flame? A) Inner zone. B) Middle zone. C) Outer zone. D) None of the above. Show Answer Correct Answer: C) Outer zone. 5. Burning of charcoal in a closed room will produce A) Carbon dioxide. B) Nitrogen dioxide. C) Carbon monoxide. D) All of these. Show Answer Correct Answer: C) Carbon monoxide. 6. Which chemical is used in the rubbing surface provided for matchsticks? A) (a) Sulphur. B) GOLD. C) WHITE PHOSPHORUS. D) RED PHOSPHORUS. Show Answer Correct Answer: D) RED PHOSPHORUS. 7. Which one of the following is fuel of out body? A) Food. B) Petrol. C) Diesel. D) Water. Show Answer Correct Answer: A) Food. 8. Nitrogen in coal A) Is present upto 1-2%. B) Comes from protein in parent vegetable matter. C) Is recovered as ammonia during its carbonization. D) All (a), (b) and (c. Show Answer Correct Answer: D) All (a), (b) and (c. 9. LPG burns with a A) Non luminous flame. B) Luminous flame. C) Yellow flame. D) Both a and b. Show Answer Correct Answer: A) Non luminous flame. 10. There are following zones of flame A) No zone. B) Two. C) Four. D) Three. Show Answer Correct Answer: D) Three. 11. Which gas helps in the process of combustion? A) Oxygen gas. B) Producer gas. C) Cooking gas. D) Nitrogen gas. Show Answer Correct Answer: A) Oxygen gas. 12. Which zone of a flame does a goldsmith use for melting gold and silver? A) Middle part. B) Top part. C) Outer part. D) Inner part. Show Answer Correct Answer: C) Outer part. 13. The substance which give heat and light after combustion are called A) Flame. B) Fuel. C) Combustion. D) None of these. Show Answer Correct Answer: B) Fuel. 14. How many types of combustion is there A) 2. B) 5. C) 6. D) 4. Show Answer Correct Answer: D) 4. 15. Which of the following fuels is used for running automobiles? A) CNG. B) PETROL. C) BOTH A& B. D) WOOD. Show Answer Correct Answer: C) BOTH A& B. 16. During combustion of a material, generally: A) Heat energy is released. B) Light energy is released. C) Both (a) and (b). D) Chemical energy is released. Show Answer Correct Answer: C) Both (a) and (b). 17. In the presence of water, ignition Temperature of paper is- A) Decrease. B) Increase. C) Remain constant. D) None of these. Show Answer Correct Answer: A) Decrease. 18. Water is not used to control fires involving electrical appliances. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 19. Combustion due to external heating which produces both heat and light A) Spontaneous combustion. B) Explosion. C) Rapid combustion. D) None of these. Show Answer Correct Answer: C) Rapid combustion. 20. Burning of charcoal in room will produce A) Carbon dioxide. B) Nitrogen dioxide. C) Carbon monoxide. D) All of these. Show Answer Correct Answer: C) Carbon monoxide. 21. Substances which catch fire are called A) Combustible. B) Bases. C) Non of these. D) Burners. Show Answer Correct Answer: A) Combustible. 22. ..... is a cleaner fuel and is being replaced by petrol and diesel. A) Kerosene oil. B) LPG. C) CNG. D) None of the above. Show Answer Correct Answer: C) CNG. 23. What is the type of combustion which occurs rapidly and produce heat and light? A) Rapid combustion. B) Fast combustion. C) Explosion. D) Spontaneous combustion. Show Answer Correct Answer: A) Rapid combustion. 24. What is the difference between complete and incomplete combustion? A) Complete combustion occurs without any oxygen present. B) Incomplete combustion produces only carbon dioxide and water. C) Complete combustion produces only carbon monoxide and soot. D) Complete combustion produces carbon dioxide and water, while incomplete combustion produces carbon monoxide and soot. Show Answer Correct Answer: D) Complete combustion produces carbon dioxide and water, while incomplete combustion produces carbon monoxide and soot. 25. Place a piece of burning charcoal on an iron plate and cover it with a plastic jar. The charcoal stops burning because A) Its ignition temperature is lowered. B) Supply of oxygen is cut off. C) It becomes cold after sometime. D) None of above. Show Answer Correct Answer: B) Supply of oxygen is cut off. 26. What happens in the dark zone of the candle?? A) Black in colour. B) Meted wax evaporates. C) Zone of no combustion. D) Least hottest zone. Show Answer Correct Answer: B) Meted wax evaporates. 27. CNG and LPG are the examples of A) Solid fuels. B) Liquid fuels. C) Gaseous fuels. D) They are not fuels. Show Answer Correct Answer: C) Gaseous fuels. 28. What is combustion A) Chemical process. B) Physical process. C) None of these. D) Both a & b. Show Answer Correct Answer: A) Chemical process. 29. Which gas is produced during the combustion of hydrocarbons? A) Nitrogen (N2). B) Oxygen (O2). C) Hydrogen (H2). D) Carbon dioxide (CO2). Show Answer Correct Answer: D) Carbon dioxide (CO2). 30. Calculate the theoretical weight and volume of air at NTP, required for the complete combustion of 1 kg of coke A) 8889 liters. B) 9899 liters. C) 8989 liters. D) 8789 liters. Show Answer Correct Answer: A) 8889 liters. 31. Which one of the following is fuel of our body? A) Water. B) Diesel. C) Petrol. D) Food. Show Answer Correct Answer: D) Food. 32. Larger and irregular lumps of solid fuel (e.g. coal) when fired in a boiler or furnace may lead to A) Low thermal efficiency. B) High excess air. C) Large unburnt particles in the ash. D) All of the above. Show Answer Correct Answer: D) All of the above. 33. Name the type of combustion caused when a cracker is ignited. A) Rapid combustion. B) Spontaneous combustion. C) Explosion. D) None of the above. Show Answer Correct Answer: C) Explosion. 34. The central zone of candle flame is luminous due to A) Incomplete combustion of wax vapours. B) Complete combustion of wax vapours. C) Formation of carbon dioxide. D) No combustion of wax vapours. Show Answer Correct Answer: A) Incomplete combustion of wax vapours. 35. The minimum temperature at which a material ignites is called A) Melting point. B) Highest temperature. C) Ignition Temperature. D) Burning point. Show Answer Correct Answer: C) Ignition Temperature. 36. The three essential requirements for the production of fire are ..... , ..... , and ..... A) Oxygen, carbon dioxide, fuel. B) Fuel, air, heat. C) Carbon dioxide, heat, air. D) None of the above. Show Answer Correct Answer: B) Fuel, air, heat. 37. Which of the following can be used to generate electricity A) Wind. B) Soil. C) Stone. D) Glass. Show Answer Correct Answer: A) Wind. 38. Is wood a inflammable substance?? A) NO !!. B) Maybe . C) Sometimes. D) I don't really know (seriously !!??). Show Answer Correct Answer: A) NO !!. 39. Combustible substances are also known as A) Non-flammable. B) Inflammable. C) Illuminous. D) Flaming. Show Answer Correct Answer: B) Inflammable. 40. ..... burns rapidly at room temperature. A) Phosphorus. B) Mercury. C) LPG. D) None of these. Show Answer Correct Answer: A) Phosphorus. 41. Global warming is caused due to ..... concentration of CO2 in air A) Decreased. B) Increased. C) Both a & b. D) None of these. Show Answer Correct Answer: B) Increased. 42. Spontaneous combustion occurs in case of A) Firecrackers. B) Magnesium ribbon. C) Forest fire. D) Wax candle. Show Answer Correct Answer: C) Forest fire. 43. What is essential for combustion? A) Helium. B) Oxygen. C) Water. D) Paper. Show Answer Correct Answer: B) Oxygen. 44. Fire extinguisher- A) Raise up temperature of fuel. B) Bring down the temperature of fuel. C) Cut off the supply of air. D) None of these. Show Answer Correct Answer: B) Bring down the temperature of fuel. 45. The calorific value of a fuel is expressed in a unit called ..... (kJ / kg). A) Kilojoule per kilogram. B) Kilojoule per litre. C) Kilojoule per gram. D) None of the above. Show Answer Correct Answer: A) Kilojoule per kilogram. 46. Carbon dioxide as fire extinguisher not only forms a blanket around the fire, it also brings down the temperature of the fuel. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 47. Which substance give heat and light after combustion? A) Flame. B) Fuel. C) Combustion. D) None. Show Answer Correct Answer: A) Flame. 48. I am an excellent fire extinguisher. I can be stored at high pressure as a liquid in cylinders. Who am I? A) Oxygen. B) Water. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: C) Carbon dioxide. 49. A fire can be controlled by A) Lowering the ignition temperature. B) Cutting off the supply of supporter of combustion. C) Both a and b. D) Neither a nor b. Show Answer Correct Answer: B) Cutting off the supply of supporter of combustion. 50. OBSERVE THE FOLLOWING STATEMENTS:1.) good fuel-very costly.2.) innermost zone of candle flame-black3.) calorific value of a fuel-kilojoule per kg (kJ / kg)4.) middle zone of candle flame-blueChoose the correct statements. A) 1 & 4. B) 1 & 3. C) 2 & 3. D) All of the above. Show Answer Correct Answer: C) 2 & 3. 51. Combustion requires three elements:fuel, oxygen, and ..... A) Water. B) Heat. C) Carbon dioxide. D) Nitrogen. Show Answer Correct Answer: B) Heat. 52. What is the chemical process that takes place during the burning of candles? A) Photosynthesis. B) Breath. C) Combustion. D) Fermentation. Show Answer Correct Answer: C) Combustion. 53. Fuel must be heated to its ..... before it starts burning A) Ignition temperature. B) Heating temperature. C) Boiling temperature. D) None of these. Show Answer Correct Answer: A) Ignition temperature. 54. Carbon fuels like wood, coal, petroleum release in burnt carbon particles dangerous pollutants causing respiratory problems. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 55. Coal burns in air producing ..... , ..... , and ..... A) CO2, heat, light. B) CO2, heat, flame. C) O2, light, heat. D) None of the above. Show Answer Correct Answer: A) CO2, heat, light. 56. Rapid Combustion occurs when ..... A) Gas bums and produces heat & light. B) There is evolution of heat. C) None of these. D) Both of these. Show Answer Correct Answer: A) Gas bums and produces heat & light. 57. ..... of fuel forms poisonous carbon monoxide gas. A) Heating. B) Incomplete combustion. C) Cooling. D) Complete combustion. Show Answer Correct Answer: B) Incomplete combustion. 58. Define combustion ..... A) The process of burning a substance in the presence of oxygen to give out heat and light. B) Combustion is a chemical process where something burns for our use. C) When something burns in the presence of oxygen, it is called combustion. D) When a particular object catches fire, in the presence of air (oxygen), it is called combustion. Show Answer Correct Answer: A) The process of burning a substance in the presence of oxygen to give out heat and light. 59. An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel? A) Kerosene. B) Petrol. C) Coal. D) Compressed Natural Gas (CNG). Show Answer Correct Answer: D) Compressed Natural Gas (CNG). 60. Burning of LPG is an example of A) Spontaneous. B) Rapid. C) Explosion. D) None. Show Answer Correct Answer: B) Rapid. 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