This quiz works best with JavaScript enabled. Home > Cbse > Class 8 > Science > Combustion And Flame > Class 8 Science Chapter 6 Combustion And Flame – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 8 Science Chapter 6 Combustion And Flame Quiz 4 (37 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The suspended particles released by combustion of coal in air may lead to a health disease. selcet the correct option A) Arthritis. B) Bone cancer. C) Asthma. D) Goiter. Show Answer Correct Answer: A) Arthritis. 2. The gas which contributes maximum to the heating value of natural gas is A) CH4. B) CO2. C) H2. D) CO. Show Answer Correct Answer: A) CH4. 3. Fire is extinguished by A) Removing all combustible substance. B) Cutting off supply of air. C) Cooling the burning substance. D) All the these. Show Answer Correct Answer: D) All the these. 4. The zone of the candle flame which is moderately hot is called, A) Luminous zone. B) Non-luminous zone. C) Lower blue zone. D) Inner dark zone. Show Answer Correct Answer: A) Luminous zone. 5. Respiration is a reaction which can be called A) Substitution. B) Polymerisation. C) Carbonization. D) Combustion. Show Answer Correct Answer: D) Combustion. 6. Fuel efficiency is expressed in terms of its calorific value of kJ/kg A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 7. NAME THE HOTTEST PART OF FLAME A) OUTERMOST REGION. B) INNERMOST REGION. C) YELLOW REGION. D) MIDDLE REGION. Show Answer Correct Answer: A) OUTERMOST REGION. 8. Incomplete combustion of a fuel gives poisonous carbon monoxide. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. The colour of the outer zone of a candle flame is A) Red. B) Blue. C) Yellow. D) Orange. Show Answer Correct Answer: B) Blue. 10. In the sun, light and heat are produced by A) Burning reactions. B) Nuclear reactions. C) Chemical reactions. D) Bunsen burner. Show Answer Correct Answer: B) Nuclear reactions. 11. Water cannot be used as a fire extinguisher to put out A) Forest fires. B) Burning coal. C) Burning wood. D) Electrical fires. Show Answer Correct Answer: D) Electrical fires. 12. Which type of combustion is responsible for the gas burning and producing heat and light. A) Explosion. B) Spontaneous combustion. C) Rapid combustion. D) None of the above. Show Answer Correct Answer: C) Rapid combustion. 13. Which of the following fuel has highest calorific value? A) Wood. B) Coal. C) Petrol. D) Hydrogen. Show Answer Correct Answer: D) Hydrogen. 14. Name the type of combustion in which a material suddenly bursts into flames without the application of any apparent cause. A) Rapid combustion. B) Spontaneous combustion. C) Explosion. D) None of the above. Show Answer Correct Answer: B) Spontaneous combustion. 15. A sooty flame can be made non-luminous by A) Shutting gas supply. B) Admitting more air. C) Shutting air supply. D) Admitting more gas. Show Answer Correct Answer: B) Admitting more air. 16. In which form the colfloric value represent? A) (kJ/kg). B) Gram. C) Kilogram. D) Both 1 & 3. Show Answer Correct Answer: A) (kJ/kg). 17. CO$_{2}$ is stored as a liquid in cylinder at A) Low temperature. B) High pressure. C) Low pressure. D) High temperature. Show Answer Correct Answer: B) High pressure. 18. In a fire triangle, what are the three essential components needed for combustion? A) Fuel, water and heat. B) Oxygen, fuel and heat. C) Carbon, oxygen and fuel. D) Water, air and heat. Show Answer Correct Answer: B) Oxygen, fuel and heat. 19. What is the most common fire extinguisher A) Petroleum. B) LPG. C) Water. D) None of the above. Show Answer Correct Answer: C) Water. 20. Why does a piece of paper burn with yellow flame? A) Very high ignition temperature. B) Inadequate supply of oxygen. C) Very low ignition temperature. D) All of the above. Show Answer Correct Answer: B) Inadequate supply of oxygen. 21. Does magnesium produce heat and light during its combustion? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. What do not produce flames but generate heat A) Wood. B) Oil. C) Coal. D) Petroleum. Show Answer Correct Answer: C) Coal. 23. The black residue left behind during incomplete combustion is A) Soot. B) Wax. C) Ash. D) Fuel. Show Answer Correct Answer: A) Soot. 24. What is the calorific value of a fuel? A) The calorific value refers to the fuel's color. B) The calorific value of a fuel is the energy released during its combustion. C) The calorific value is the price of the fuel. D) The calorific value is the weight of the fuel. Show Answer Correct Answer: B) The calorific value of a fuel is the energy released during its combustion. 25. Coal burns to produce A) Calcium bicarbonate. B) Oxygen. C) Carbon dioxide. D) Magnesium. Show Answer Correct Answer: C) Carbon dioxide. 26. Wood is a better fuel than LPG. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 27. Essential requirements for producing fire are A) Fuel. B) Air. C) Heat. D) All of these. Show Answer Correct Answer: D) All of these. 28. What is the combustion of the blue in the gas flame? A) Oxygenation. B) Carbon. C) Sodium. D) Hydrogen. Show Answer Correct Answer: D) Hydrogen. 29. For fires involving oil and petrol, which fire extinguisher will be suitable? A) Carbon Monoxide. B) Sodium Bicarbonate. C) Carbon dioxide. D) Water. Show Answer Correct Answer: C) Carbon dioxide. 30. The total amount of heat or energy produced by one kg of fuel is the A) Specific heat. B) Gross calorific value(GCV). C) Heat content. D) Net calorific value (NCV). Show Answer Correct Answer: D) Net calorific value (NCV). 31. An example of spontaneous combustion is cold dust, forest fire which is A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 32. A temperature at which the substance burns is called A) Ignition temperature. B) Melting. C) Evaporation. D) Boiling temperature. Show Answer Correct Answer: A) Ignition temperature. 33. On the basis of the combustion, classify the substance A) Combustible. B) Non-combustible. C) Both of these. D) None of these. Show Answer Correct Answer: C) Both of these. 34. Magnesium burns to form A) Magnesium oxide. B) Calcium carbonate. C) Magnesium sulphate. D) Calcium oxide. Show Answer Correct Answer: A) Magnesium oxide. 35. A good fuel is on which is A) Cheap. B) Produces large number of heat. C) Readily available. D) All of these. Show Answer Correct Answer: D) All of these. 36. Substances which have very low ignition temperature and can catch fire easily are called A) Flammable substances. B) Inflammable substances. C) Combustible substances. D) All of these. Show Answer Correct Answer: B) Inflammable substances. 37. Which is non combustible substance? A) Iron nails. B) Wood. C) Paper. D) Straw. Show Answer Correct Answer: A) Iron nails. ← PreviousRelated QuizzesScience QuizzesClass 8 QuizzesClass 8 Science Chapter 6 Combustion And Flame Quiz 1Class 8 Science Chapter 6 Combustion And Flame Quiz 2Class 8 Science Chapter 6 Combustion And Flame Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books