{"id":10704,"date":"2022-05-19T05:00:47","date_gmt":"2022-05-18T23:30:47","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=10704"},"modified":"2022-05-12T12:57:04","modified_gmt":"2022-05-12T07:27:04","slug":"mcq-questions-for-class-8-science-chapter-6","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-8-science-chapter-6\/","title":{"rendered":"MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame"},"content":{"rendered":"

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. MCQ Questions for Class 8 Science with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Combustion and Flame Class 8 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Combustion and Flame Class 8 MCQs Questions with Answers<\/h2>\n

Solving the Combustion and Flame Multiple Choice Questions of Class 8 Science Chapter 6 MCQ can be of extreme help as you will be aware of all the concepts. 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. Have a glance at the MCQ of Chapter 6 Science Class 8 and cross-check your answers during preparation.<\/p>\n

Question 1.
\nWhich of the following fuel produces ash on burning:
\n(a) wood
\n(b) LPG
\n(c) petrol
\n(d) diesel<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) wood
\nWood produces ash on burning.<\/p>\n<\/details>\n

\n

Question 2.
\nThe zone of a flame used by goldsmith for melting gold and silver is:
\n(a) innermost zone
\n(b) middle zone
\n(c) outermost zone
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) outermost zone
\nThe zone of a flame used by goldsmith for melting gold and silver is outermost zone because it is the hottest zone.<\/p>\n<\/details>\n

\n

Question 3.
\nCan the process of rusting he called combustion ?
\n(a) yes
\n(b) no
\n(c) can\u2019t say
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) yes
\nYes, the process of rusting can be called combustion because it produces heat.<\/p>\n<\/details>\n

\n

Question 4.
\nIs heat and light produced by Sun a combustion process?
\n(a) yes
\n(b) no
\n(c) can\u2019t say
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) no
\nNo, heat and light produced by sun is not a combustion process.<\/p>\n<\/details>\n

\n

Question 5.
\nHeat and light produced in the sun is by:
\n(a) combustion
\n(b) nuclear reactions
\n(c) burning
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) nuclear reactions
\nHeat and light produced in the sun is by nuclear reactions.<\/p>\n<\/details>\n

\n

Question 6.
\nIgnition temperature is the:
\n(a) temperature at which a substance catches fire
\n(b) highest temperature at which a substance catches fire
\n(c) lowest temperature at which a substance catches fire
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) lowest temperature at which a substance catches fire
\nIgnition temperature is the lowest temperature at which a substance catches fire<\/p>\n<\/details>\n

\n

Question 7.
\nWhich of them can be easily burnt with the help of a matchstick?
\n(a) wooden chips
\n(b) straw
\n(c) wooden log
\n(d) all of them<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) straw
\nStraw can be easily burnt with the help of a matchstick because the ignition temperature of straw is very less and heat produced from lighted matchstick is more than the ignition temperature of straw and therefore it starts burning.<\/p>\n<\/details>\n

\n

Question 8.
\nA mgtchstjck does not catch fire on its own at room temperature because its:
\n(a) ignition temperature is more than room temperature
\n(b) ignition temperature is less than room temperature
\n(c) ignition temperature is same as room temperature
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) ignition temperature is more than room temperature
\nA matchstick does not catch fire on its own at room temperature because its ignition temperature is more than room temperature.<\/p>\n<\/details>\n

\n

Question 9.
\nWhich of the following gas extinguishes fire:
\n(a) oxygen
\n(b) hydrogen
\n(c) carbon dioxide
\n(d) nitrogen<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) carbon dioxide
\nCarbon dioxide gas extinguishes fire.<\/p>\n<\/details>\n

\n

Question 10.
\nCombustion that takes place at a very fast rate is called:
\n(a) rapid combustion
\n(b) spontaneous combustion
\n(c) explosion
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) rapid combustion
\nCombustion that takes place at a very fast rate is called rapid combustion.<\/p>\n<\/details>\n

\n

Question 11.
\nThe coldest zone of candle is:
\n(a) the middle zone
\n(b) the innermost zone
\n(c) the outermost zone
\n(d) none of these.<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) the innermost zone
\nThe coldest zone of candle is the innermost zone.<\/p>\n<\/details>\n

\n

Question 12.
\nSmoke contains:
\n(a) unburnt carbon particles
\n(b) burnt carbon particles
\n(c) unburnt sulphur particles
\n(d) unburnt lead particles.<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) burnt carbon particles
\nSmoke contains unburnt carbon particles.<\/p>\n<\/details>\n

\n

Question 13.
\nThe colour of the non-luminous zone is:
\n(a) white
\n(b) yellow
\n(c) blue
\n(d) black<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) blue
\nThe colour of the non-luminous zone is blue.<\/p>\n<\/details>\n

\n

Question 14.
\nWhich of the following fuel has the highest calorific value:
\n(a) cow dung cake
\n(b) Wood
\n(c) coal
\n(d) Petrol<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) Petrol
\nPetrol has higher calorific value than petrol.<\/p>\n<\/details>\n

\n

Question 15.
\nThe fuel which replaces use of diesel and petrol as fuels in automobiles is:
\n(a) LPG
\n(b) biogas
\n(c) CNG
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) CNG
\nCNG has replaced use of diesel and petrol as fuels in automobiles because it is non-pollutant fuel.<\/p>\n<\/details>\n

\n

Question 16.
\nWhich of following does not produce flame on burning:
\n(a) LPG
\n(b) charcoal
\n(c) paper
\n(d) kerosene<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) charcoal
\nLPQ paper and kerosene produces flame on burning whereas charcoal does not produce flame on burning.<\/p>\n<\/details>\n

\n

Question 17.
\nWhich of the following is best fuel for automobiles:
\n(a) petrol
\n(b) CNG
\n(c) diesel
\n(d) kerosene<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) CNG
\nCNG is best fuel for automobiles as it produces pollutants in very small amounts.<\/p>\n<\/details>\n

\n

Question 18.
\nwhich of the following causes global warming:
\n(a) carbon dioxide
\n(b) carbon monoxide
\n(c) nitrogen dioxide
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) carbon dioxide
\nCarbon dioxide causes global warming.<\/p>\n<\/details>\n

\n

Question 19.
\nThe unit of calorifie virtue is:
\n(a) kilojoules per kg
\n(b) joules per kg
\n(c) kilojoules per grain
\n(d) joules per gram<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) kilojoules per kg
\nThe unit of calorific value is Kilojoules per kg.<\/p>\n<\/details>\n

\n

Question 20.
\nThe hottest zone of candle fleme is:
\n(a) outermost zone
\n(b) in memos zone
\n(c) middle zone
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) outermost zone
\nThe hottest zone of candle flame is outermost zone.<\/p>\n<\/details>\n

\n

Question 21.
\nA chemical process in which a substance reacts with oxygen to give off heat is called.
\n(a) reduction
\n(b) evaporation
\n(c) combustion
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) combustion
\nCombustion is a chemical process in which a substance reacts with oxygen to give off heat.<\/p>\n<\/details>\n

\n

Question 22.
\nWhich of the following burns with flame:
\n(a) coal
\n(b) cow dung
\n(c) candle
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(c) candle
\nCandle burns with a flame, coal, cow dung does not burn with a flame.<\/p>\n<\/details>\n

\n

Question 23.
\nMagnesium burns in air to form
\n(a) magnesium oxide
\n(b) heat
\n(c) light
\n(d) all of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) all of these
\nMagnesium bums in air to form magnesium oxide, heat and light.<\/p>\n<\/details>\n

\n

Question 24.
\nWhich of the following substance is not combustible:
\n(a) matchstick
\n(b) straw
\n(c) charcoal
\n(d) glass<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) glass
\nGlass is not combustible. Matchstick, straw and charcoal are combustible.<\/p>\n<\/details>\n

\n

Question 25.
\nIn which of the following conditions combustion takes place:
\n(a) the presence of a combustible substance
\n(b) the presence of air with sufficient amount of oxygen
\n(c) the temperature of combustible substance should be more than its ignition temperature
\n(d) all the above conditions are necessary<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) all the above conditions are necessary
\nThe 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.<\/p>\n<\/details>\n

\n

Question 26.
\nWhich of the following is smoke free fuel:
\n(a) wood
\n(b) LPG
\n(c) charcoal
\n(d) coal<\/p>\n

\nAnswer<\/span><\/summary>\n

(b) LPG
\nLPG is smoke free fuel, wood, charcoal and coal produces smoke on burning.<\/p>\n<\/details>\n

\n

Question 27.
\nCoal mainly contains:
\n(a) carbon
\n(b) nitrogen and Sulphur
\n(c) carbon, hydrogen and nitrogen
\n(d) none of these<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) carbon
\nCoal mainly contains carbon.<\/p>\n<\/details>\n

\n

Question 28.
\nWhich poisonous gas is formed as a result of incomplete combustion ?
\n(a) carbon monoxide
\n(b) coal gas
\n(c) carbon dioxide
\n(d) nitrogen oxide<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) carbon monoxide
\nThe poisonous gas formed as a result of incomplete combustion is carbon monoxide.<\/p>\n<\/details>\n

\n

Question 29.
\nThe natural solid fuel is:
\n(a) coal
\n(b) charcoal
\n(c) coke
\n(d) LPG<\/p>\n

\nAnswer<\/span><\/summary>\n

(a) coal
\nThe natural solid fuel is coal.<\/p>\n<\/details>\n

\n

Question 30.
\nWhich of the following give us pollution free environment on burning:
\n(a) wood
\n(b) kerosene
\n(c) cow dung cakes
\n(d) biogas<\/p>\n

\nAnswer<\/span><\/summary>\n

(d) biogas
\nBiogas gives us pollution free environment on burning.<\/p>\n<\/details>\n

\n

Match the Column-A with Column-B:<\/span><\/p>\n

Question 1.<\/p>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Charcoal<\/td>\n(i) Inflammable substance<\/td>\n<\/tr>\n
(b) Iron nails<\/td>\n(ii) Combustible substance<\/td>\n<\/tr>\n
(c) Petrol<\/td>\n(iii) Non-combustible substance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Charcoal<\/td>\n(ii) Combustible substance<\/td>\n<\/tr>\n
(b) Iron nails<\/td>\n(iii) Non-combustible substance<\/td>\n<\/tr>\n
(c) Petrol<\/td>\n(i) Inflammable substance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Question 2.<\/p>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Rapid Combustion<\/td>\n(i) When a sudden reaction takes place with the evolution of heat, light, sound and large amount of gas.<\/td>\n<\/tr>\n
(b) Spontaneous Combustion<\/td>\n(ii) When gas burns rapidly and produces heat and light.<\/td>\n<\/tr>\n
(c) Explosion<\/td>\n(iii) When a material suddenly bursts into flames, without , the application of any apparent cause<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Rapid Combustion<\/td>\n(ii) When gas burns rapidly and produces heat and light.<\/td>\n<\/tr>\n
(b) Spontaneous Combustion<\/td>\n(iii) When a material suddenly bursts into flames, without , the application of any apparent cause<\/td>\n<\/tr>\n
(c) Explosion<\/td>\n(i) When a sudden reaction takes place with the evolution of heat, light, sound and large amount of gas.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Question 3.<\/p>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Ignition temperature<\/td>\n(i) The substances which burn in air.<\/td>\n<\/tr>\n
(b) Combustion<\/td>\n(ii) Substances having very low ignition temperature.<\/td>\n<\/tr>\n
(c) Inflammable substances<\/td>\n(iii) The lowest temperature at which a combustible substance catches fire.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n\n\n\n\n\n\n
Column-A<\/strong><\/td>\nColumn-B<\/strong><\/td>\n<\/tr>\n
(a) Ignition temperature<\/td>\n(iii) The lowest temperature at which a combustible substance catches fire.<\/td>\n<\/tr>\n
(b) Combustion<\/td>\n(i) The substances which burn in air.<\/td>\n<\/tr>\n
(c) Inflammable substances<\/td>\n(ii) Substances having very low ignition temperature.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

State whether the following statements are True or False:<\/span><\/p>\n

Question 1.
\nUnburnt carbon particles in air are dangerous pollutants causing respiratory problems.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 2.
\nDecreased percentage of carbon dioxide in air has been linked to global warming.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 3.
\nWater can be used to control fires involving electric equipment or oils.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 4.
\nLPG is a better domestic fuel than wood.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 5.
\nIn the sun heat and light are produced by nuclear reactions.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 6.
\nCoal is not a fossil fuel.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 7.
\nWildlife and minerals are exhaustible natural resources.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 8.
\nCoal mainly contains hydrogen.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 9.
\nPetroleum is a dark oily liquid.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 10.
\nCNG is Compressed Natural Gas.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 11.
\nLPG has more calorific value than wood.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 12.
\nA goldsmith use the middle zone of a flame for melting gold, and silver.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question 13.
\nThe hottest zone of the flame is outermost zone.<\/p>\n

\nAnswer<\/span><\/summary>\n

True<\/p>\n<\/details>\n

\n

Question 14.
\nA piece of charcoal burns in air and produces carbon monoxide.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Question\u00a0 15.
\nThe ignition temperature of wood is lower than that of kerosene oil.<\/p>\n

\nAnswer<\/span><\/summary>\n

False<\/p>\n<\/details>\n

\n

Fill in the blanks:<\/span><\/p>\n

Question 1.
\nBurning of wood and coal causes …………………… of air.<\/p>\n

\nAnswer<\/span><\/summary>\n

pollution<\/p>\n<\/details>\n

\n

Question 2.
\nThe unit of calorific value of a fuel is ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

kilojoules\/kilogram<\/p>\n<\/details>\n

\n

Question 3.
\nCement is a …………………… substance.<\/p>\n

\nAnswer<\/span><\/summary>\n

non-combustible substance<\/p>\n<\/details>\n

\n

Question 4.
\nThe slow process of conversion of dead vegetation into coal is called ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

carbonisation<\/p>\n<\/details>\n

\n

Question 5.
\n…………………… is a tough, porous and black substance.<\/p>\n

\nAnswer<\/span><\/summary>\n

Coke<\/p>\n<\/details>\n

\n

Question 6.
\nA combustible substance cannot catch fire or bum as long as its temperature is lower than its …………………… temperature.<\/p>\n

\nAnswer<\/span><\/summary>\n

ignition<\/p>\n<\/details>\n

\n

Question 7.
\nThe three essential requirements for producing fire are ……………………, …………………… and ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

fuel, air, heat<\/p>\n<\/details>\n

\n

Question 8.
\nLPG is …………………… …………………… ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Liquefied Petroleum Gas<\/p>\n<\/details>\n

\n

Question 9.
\nProcess of separation of different constituents from petroleum is called …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

refining<\/p>\n<\/details>\n

\n

Question 10.
\n…………………… is the rise in temperature of the environment of the earth.<\/p>\n

\nAnswer<\/span><\/summary>\n

Global warming<\/p>\n<\/details>\n

\n

Question 11.
\nA liquid fuel, used in homes is ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

kerosene<\/p>\n<\/details>\n

\n

Question 12.
\nFuel must be heated to its …………………… before it starts burning.<\/p>\n

\nAnswer<\/span><\/summary>\n

ignition temperature<\/p>\n<\/details>\n

\n

Question 13.
\nFire produced by oil cannot be controlled by ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

water<\/p>\n<\/details>\n

\n

Question 14.
\nFuels are stores of energy which of burning give …………………… and …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

heat and light<\/p>\n<\/details>\n

\n

Question 15.
\nThe colour of outermost zone is ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

blue<\/p>\n<\/details>\n

\n

Question 16.
\nThe colour of innermost zone of the flame is …………………….<\/p>\n

\nAnswer<\/span><\/summary>\n

dark<\/p>\n<\/details>\n

\n

Question 17.
\nFire brigade uses …………………… to extinguish the fire.<\/p>\n

\nAnswer<\/span><\/summary>\n

water<\/p>\n<\/details>\n

\n

Question 18.
\nIncomplete combustion of a fuel gives poisonous …………………… gas.<\/p>\n

\nAnswer<\/span><\/summary>\n

carbon monoxide<\/p>\n<\/details>\n

\n

Question 19.
\nInflammable substances have very …………………… ignition temperature.<\/p>\n

\nAnswer<\/span><\/summary>\n

low<\/p>\n<\/details>\n

\n

Question 20.
\nThe substances which burn in air are called ……………………<\/p>\n

\nAnswer<\/span><\/summary>\n

combustible<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download is true and genuine as far as our knowledge is concerned. 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.<\/p>\n","protected":false},"excerpt":{"rendered":"

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. MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Combustion and Flame Class 8 MCQs Questions with Answers …<\/p>\n

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