(a) wood Blast furnace gas, D. (c) candle (a) carbon monoxide (d) none of these. Which poisonous gas is formed as a result of incomplete combustion ? CNG is best fuel for automobiles as it produces pollutants in very small amounts. The three essential requirements for producing fire are ……………………, …………………… and ……………………, Question 8. Question 27. (d) Petrol. Burning of wood and coal causes …………………… of air. The colour of outermost zone is ……………………. (d) coal. (b) burnt carbon particles (d) all of these. Yes, the process of rusting can be called combustion because it produces heat. Question 17. Inflammable substances have very …………………… ignition temperature. Question 8. Answer. Unburnt carbon particles in air are dangerous pollutants causing respiratory problems. Question 1. (a) temperature at which a substance catches fire Question 2. Low preheat of air, B. Bomb calorimeter can be used to determine the __________ of the coal. Learn Fuels And Combustion MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The hottest zone of the flame is outermost zone. (c) outermost zone LPG has more calorific value than wood. 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MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. (d) all of these. The colour of the non-luminous zone is: (a) LPG Which of them can be easily burnt with the help of a matchstick? (c) carbon, hydrogen and nitrogen Question 7. (c) carbon dioxide (b) the presence of air with sufficient amount of oxygen Glass is not combustible. (iii) The lowest temperature at which a combustible substance catches fire. Answer: Liquefied Petroleum Gas. Combustion and Flame Class 8 Extra Questions Science Chapter 6 Combustion and Flame Class 8 Extra Questions Very Short Answer Questions Question 1. (c) CNG If you feel any information regarding CBSE Class 8 Science Combustion and Flame MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly. Question 13. (ii) Substances having very low ignition temperature. Question 23. Combustion that takes place at a very fast rate is called: Fuels are stores of energy which of burning give …………………… and ……………………. Amount of heat energy produced on complete combustion of 1kg of fuel is called : (a) energy value (b) combustion value (c) heat value (d) calorific value (d) calorific value. Answer ALL the question in Part -A 3. A goldsmith use the middle zone of a flame for melting gold, and silver. %PDF-1.6 %���� (d) biogas. To get more questions visit other sections. The zone of a flame used by goldsmith for melting gold and silver is outermost zone because it is the hottest zone. (c) paper (a) coal 15. (d) biogas Question 20. Question 19. Wildlife and minerals are exhaustible natural resources. Fuel must be heated to its …………………… before it starts burning. Water can be used to control fires involving electric equipment or oils. Have a glance at the MCQ of Chapter 6 Science Class 8 and cross-check your answers during preparation. The unit of calorifie virtue is: (b) charcoal (c) coke (c) the temperature of combustible substance should be more than its ignition temperature The poisonous gas formed as a result of incomplete combustion is carbon monoxide. (b) nitrogen and Sulphur Question  15. (c) charcoal (d) all of these. (a) coal (b) CNG Heat and light produced in the sun is by: (d) glass. (c) explosion (d) unburnt lead particles. (a) LPG Name the most common fuel used in homes. When hydrocarbon fuels burn in a plentiful supply of air they undergo complete combustion, forming carbon dioxide and water vapour. L.D. Petroleum is a dark oily liquid. (d) none of these. 54 0 obj <>/Filter/FlateDecode/ID[]/Index[7 171]/Info 6 0 R/Length 201/Prev 1406443/Root 8 0 R/Size 178/Type/XRef/W[1 3 1]>>stream Question. (d) none of these, (c) lowest temperature at which a substance catches fire LPG is a better domestic fuel than wood. (b) in memos zone converter gas, A. Question 14. Question 13. All of the above. These MCQ Questions on Combustion and Flame Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Both A & B, D. (b) middle zone Incomplete combustion of a fuel gives poisonous …………………… gas. (a) kilojoules per kg 0 (d) diesel, Question 2. (a) wood (LPG) Question 2. Junkar's, D. Boy's, C. Cement is a …………………… substance. (b) burnt carbon particles (a) carbon dioxide This makes the piece of paper burn with a yellowish flame. Combustion that takes place at a very fast rate is called rapid combustion. (b) no (c) can’t say Which of the following burns with flame: A. The colour of the non-luminous zone is blue. CNG is Compressed Natural Gas. (d) all the above conditions are necessary Which of the following fuel produces ash on burning: The slow process of conversion of dead vegetation into coal is called ……………………. Fire produced by oil cannot be controlled by ……………………. None of these, A. (b) the innermost zone Fine grinding, C. (b) cow dung Question 3. (a) petrol High excess air, D. Question 10. (d) all the above conditions are necessary. (a) cow dung cake (a) kilojoules per kg Question 19. A liquid fuel, used in homes is ……………………. Question 1. Question 4. Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download is available here. Question 11. (a) white (a) carbon Feel free to download the question paper which is attached in PDF file format here and use it to prepare for your upcoming exams. (c) charcoal A chemical process in which a substance reacts with oxygen to give off heat is called. (b) hydrogen Question 18. (c) burning Efficient burning of anthracite coal requires. The calorific value of a fuel is expressed in kJ/kg. Coal mainly contains hydrogen. (c) diesel %%EOF (d) kerosene. (d) none of these, Question 28. Name the most common fire extinguisher. (b) straw (b) straw which of the following causes global warming: Question 4. (a) outermost zone (b) the innermost zone (c) candle (b) coal gas (c) light It is observed at petrol pumps and airports, that hydrocarbon fire extinguishers are used, instead of soda-acid fire extinguisher. (c) can’t say The natural solid fuel is: (b) heat Ignition temperature is the lowest temperature at which a substance catches fire, Question 7. (b) charcoal Which of the following is smoke free fuel: (b) nuclear reactions Which of the following give us pollution free environment on burning: Calorific value as determined by bomb calorimeter is the. The hottest zone of candle flame is outermost zone. Higher calorific value at constant volume, B. (d) all of these. The conditions under which combustion takes place is the presence of a combustible substance, air with sufficient amount of oxygen and ignition temperature of the combustible substance. The substances which burn in air are called ……………………. Combustion is a (a) chemical process (b) physical process (c) both of these processes (d) none of these processes (a) chemical process. Coke oven gas, B. Lower calorific value at constant pressure, D. (d) black. Learn Fuels And Combustion MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Process of separation of different constituents from petroleum is called …………………….

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