This quiz works best with JavaScript enabled. Home > Class 8 > Class 8 Science Chapter 6 Combustion And Flame ā Quiz 3 š Homepage š Download PDF Books š Premium PDF Books Class 8 Science Chapter 6 Combustion And Flame Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. Combustion requires three elements:fuel, oxygen, and ..... A) Heat. B) Nitrogen. C) Carbon dioxide. D) Water. Show Answer Correct Answer: A) Heat. 4. 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. 5. 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. 6. 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. 7. 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. 8. Good fuels have A) Low ignition temperature and high calorific value. B) High ignition temperature and high calorific value. C) Low ignition temperature and low calorific value. D) High ignition temperature and low calorific value. Show Answer Correct Answer: A) Low ignition temperature and high calorific value. 9. 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. 10. There are following zones of a flame A) Two. B) Three. C) Four. D) No any zone. Show Answer Correct Answer: B) Three. 11. ..... of fuel forms poisonous carbon monoxide gas. A) Incomplete combustion. B) Complete combustion. C) Heating. D) Cooling. Show Answer Correct Answer: A) Incomplete combustion. 12. 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. 13. 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) Compressed Natural Gas (CNG). B) Kerosene. C) Petrol. D) Coal. Show Answer Correct Answer: A) Compressed Natural Gas (CNG). 14. What is fuel?? A) Substance that produces heat and light energy on burning are called fuels. B) Kerosene, Diesel, petrol. C) Kilojoules / kilograms. D) None of the above. Show Answer Correct Answer: A) Substance that produces heat and light energy on burning are called fuels. 15. Burning of LPG is an example of A) Spontaneous. B) Rapid. C) Explosion. D) None. Show Answer Correct Answer: B) Rapid. 16. A combustible substance cannot catch fire or burn as long as its temperature is higher than its ignition temperature. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 17. The hottest part of the flame A) Outer part. B) Middle part. C) Inner part. D) Lower part. Show Answer Correct Answer: A) Outer part. 18. Combustion always results as flames A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 19. Substance that does not burn in air is A) Sand. B) Kerosene. C) Wood. D) Diesel. Show Answer Correct Answer: A) Sand. 20. When water is poured over burning wood, the fire goes off. This is because A) Temperature of wood decreases. B) Temperature of water goes up. C) Molecules of water reacts with oxygen present in the flame. D) The flame vapourises. Show Answer Correct Answer: A) Temperature of wood decreases. 21. Unburnt carbon particles of the fuel cause A) Stomach infections. B) Respiratory problems. C) Brain infections. D) Skin problems. Show Answer Correct Answer: B) Respiratory problems. 22. The substance which have very low ignition temperature will A) Catch fire easily. B) Will not catch fire. C) Catch fire after some time. D) None of these. Show Answer Correct Answer: A) Catch fire easily. 23. A fuel gives yellow flame due to A) Incomplete combustion. B) Complete combustion. C) Spontaneous combustion. D) Rapid combustion. Show Answer Correct Answer: A) Incomplete combustion. 24. Increased concentration of Carbon dioxide in the air causes ..... A) Forest fires. B) Global warming. C) Acid rain. D) None of the above. Show Answer Correct Answer: B) Global warming. 25. During the process of Combustion ..... is given out A) Heat. B) Light. C) Sound. D) All of these. 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