{"id":13091,"date":"2020-10-12T15:11:54","date_gmt":"2020-10-12T09:41:54","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=13091"},"modified":"2022-03-02T11:17:50","modified_gmt":"2022-03-02T05:47:50","slug":"combustion-and-flame-class-8-extra-questions","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/combustion-and-flame-class-8-extra-questions\/","title":{"rendered":"Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6"},"content":{"rendered":"

Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science<\/a> Question bank on a regular basis.<\/p>\n

Class 8 Science Chapter 6 Extra Questions and Answers Combustion and Flame<\/h2>\n

Extra Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers<\/strong><\/p>\n

Combustion and Flame Class 8 Extra Questions Very Short Answer Type<\/h3>\n

Question 1.
\nWhy is food called fuel for our body?
\nAnswer:
\nIn our body, food is broken down by reaction with oxygen and heat is produced. That is why, food is called fuel for our body.<\/p>\n

\"Combustion<\/p>\n

Question 2.
\nWhy does a piece of wood not burn by bringing a burning matchstick near it ?
\nAnswer:
\nWood has high ignition temperature. A burning matchstick cannot produce so much heat to reach the ignition temperature of wood. Therefore, wood does not burn.<\/p>\n

Question 3.
\nWhy is it important for all of us to know the telephone numbers of the fire service station?
\nAnswer:
\nWho knows when and where suddenly fire breaks out. The fire brigade from the fire service station could be called when fire occurs anywhere. This can be -done only when we know the telephone numbers of fire- services.<\/p>\n

Question 4.
\nHow can the fire caused by burning liquid fuels be extinguished?
\nAnswer:
\nIt can be extinguished by throwing sand or soil over it.<\/p>\n

Question 5.
\nName two types of fire extinguishers.
\nAnswer:
\nSoda acid fire extinguisher and hydrocarbon fire extinguisher are two types of fire extinguishers.<\/p>\n

Question 6.
\nName a substance which burns itself in air.
\nAnswer:
\nPhosphorus.<\/p>\n

Question 7.
\nDoes charcoal produce a flame on burning?
\nAnswer:
\nNo, charcoal does not vaporise and so does not produce a flame.<\/p>\n

\"Combustion<\/p>\n

Question 8.
\nWhich gas is formed during the incomplete combustion of any fuel?
\nAnswer:
\nCarbon monoxide gas.<\/p>\n

Combustion and Flame Class 8 Extra Questions Short Answer Type 1<\/h3>\n

Question 1.
\nDefine calorific value of fuel.
\nAnswer:
\nCalorific value : The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of. a fuel is expressed in a unit called kilojoule per kg (kJ\/kg). An ideal fuel has high calorific value.<\/p>\n

Question 2.
\nDefine ignition temperature.
\nAnswer:
\nIgnition temperature is the lowest temperature at which a combustible substance catches fire. An ideal fuel should have a proper ignition temperature.<\/p>\n

Question 3.
\nDefine combustible and non-combustible substances.
\nAnswer:
\nThe substance that undergoes combustion is said to be combustible. The substance that does not undergo combustion is called non-combustible.<\/p>\n

\"Combustion<\/p>\n

Question 4.
\nDefine ignition temperature. Do all combustible substances have same ignition temperature ?
\nAnswer:
\nThe lowest temperature at which a substance catches fire, is called its ignition temperature. All combustible substances do not have same ignition temperature. In fact, each combustible substance has different ignition temperature.<\/p>\n

Question 5.
\nDoes combustible substance catch fire on its own ? Why?
\nAnswer:
\nA combustible substance does not catch fire or bum on its own. It is so because a combustible substance does not catch fire as long as its temperature is lower than its ignition temperature.<\/p>\n

Question 6.
\nDefine spontaneous combustion.
\nAnswer:
\nThe type of combustion in which a material suddenly bursts into flames without the application of any apparent cause is called spontaneous combustion, e.g., combustion of coal dust.<\/p>\n

Question 7.
\nWhat causes fires in coal mine ?
\nAnswer:
\nSpontaneous combustion of coal dust results in many disastrous fires in coal mines.<\/p>\n

Question 8.
\nWhat leads to deforestation ? What is its effect ?
\nAnswer:
\nCutting of trees leads to deforestation. It is quite harmful as it leads to global warming.<\/p>\n

\"Combustion<\/p>\n

Question 9.
\nIs there any ideal fuel? If not, what is the alternative ?
\nAnswer:
\nThere is probably no fuel that could be considered as an ideal fuel. We should, as an alternative, look for a fuel which fulfils most of the requirements for a particular use.<\/p>\n

Question 10.
\nWhat is global warming ? What causes it ?
\nAnswer:
\nThe increase in temperature of earth\u2019s atmosphere is termed as global warming. The excess increase of carbon dioxide in atmosphere causes global warming because carbon dioxide facilitates green house effect, i.e., carbon dioxide traps hot radiations emitted by the earth\u2019s surface.<\/p>\n

Question 11.
\nWhat is done to extinguish fire due to burning of oil or petrol ?
\nAnswer:
\nFire produced by burning of oil or petrol can be controlled by throwing sand or soil over it.<\/p>\n

Combustion and Flame Class 8 Extra Questions Short Answer Type 2<\/h3>\n

Question 1.
\nWhat is flame ?
\nAnswer:
\nWhen a fuel is burned, a hot luminous gas emerges out of the burning fuel. This gas is called flame. Flames are a result of the substances which vaporize on burning. Example includes kerosene oil, wax, etc. which form flames on burning.<\/p>\n

Question 2.
\nExplain greenhouse effect. Mention any two greenhouse gases.
\nAnswer:
\nGreenhouse effect is warming of earth’s surface and atmosphere due to trapping \u00bb
\nof sun\u2019s heat by certain gases in the earth\u2019s atmosphere.<\/p>\n

Water vapour, carbon dioxide, methane and certain other gases in the air are responsible for the Greenhouse effect. Of those gases, water vapour has the largest effect.<\/p>\n

\"Combustion<\/p>\n

Question 3.
\nWhat is the role of water in extinguishing fire ?
\nAnswer:
\nWater cools the combustible material, so that its temperature is brought below its ignition temperature. This prevents the fire from spreading. Water vapours also surround the combustible materials helping in cutting the supply of air. So, the fire is extinguished.<\/p>\n

Question 4.
\nWhy can we not use water to extinguish fire that is caused due to burning of oil or petrol ? ,
\nAnswer:
\nWhen water is used to extinguish fire dur to burning of oil\/petrol, water being heavier than oil\/petrol settles down below it and it continues to burn. That is why we ~ cannot use water to extinguish fire in such a situation.<\/p>\n

Question 5.
\nWhat would you do in case of fire produced by electric short circuit?
\nAnswer:
\nIn the case of fire caused by electric short circuit, water is not used at all because it is a conductor of electricity and may cause electrocution or electric shock.<\/p>\n

The only solution is to cut off the supply of electricity and then use the spray of water on the flame to extinguish fire or use fire extinguisher.<\/p>\n

Question 6.
\nWhat is the working methodology of fire extinguisher ?
\nAnswer:
\nFire extinguisher functions in one of the following ways:
\n(i) either it cuts off supply of air to the combustible substance.
\n(ii) or it brings down the temperature of the combustible substances well below its ignition temperature.<\/p>\n

Question 7.
\nWhat are the causes of forest fires ? How can it be kept under control ?
\nAnswer:
\nForest fires sometimes occur due to the heat of the sun. However, most forest fires are due to the carelessness of human beings.<\/p>\n

So, it is important to remember that the camp fires must be completely extinguished before leaving a forest after a picnic or any, visit and people should not throw any burning thing in the forest.<\/p>\n

Question 8.
\nWhat do you mean by explosion? How does it take place ?
\nAnswer:
\nExplosion is a sudden reaction in which heat, light, sound and large amount of gas is evolved. Explosion can also take place if pressure is applied on the cracker or any other combustible material kept in large amount.<\/p>\n

\"Combustion<\/p>\n

Question 9.
\nWhat are the characteristics of an ideal fuel?
\nAnswer:
\nThe characteristics of an ideal fuel are:<\/p>\n

    \n
  1. It should be readily available,<\/li>\n
  2. It should be cheap,<\/li>\n
  3. It should bum easily in air at a moderate rate,<\/li>\n
  4. It should produce a large amount of heat, and<\/li>\n
  5. It should not leave behind any undesirable substances.<\/li>\n<\/ol>\n

    Question 10.
    \nWhat are the disadvantages of burning wood in a chulha ?
    \nAnswer:
    \nDisadvantages of burning wood in a chulha are :<\/p>\n

      \n
    1. It produces a lot of smoke, which causes respiratory problem.<\/li>\n
    2. Burning of wood leaves behind ashes, which are undesirable substances.<\/li>\n
    3. Cutting of wood for fuel leads to deforestation.<\/li>\n<\/ol>\n

      Question 11.
      \nWhat are the disadvantages of global warming ?
      \nAnswer:
      \nGlobal warming causes the rise in temperature of the atmosphere of the earth. This leads to melting of polar glaciers resulting into rise in sea level and causing floods in the coastal areas.<\/p>\n

      Combustion and Flame Class 8 Extra Questions Long Answer Type<\/h3>\n

      Question 1.
      \nWhat is the function of a fire extinguisher ? Describe various types of fire extinguishers.
      \nAnswer:
      \nFire extinguishers either cut off supply of air to the combustible substance or it brings down the temperature of the combustible substance well below its ignition temperature.<\/p>\n

      There are various types of fire extinguishers used for controlling fire:
      \n(i) Soda acid fire extinguishers: It is based on the principle of cooling the fire. Carbon dioxide is liberated along with water. Water puts off the fire by lowering the temperature of the combustible material below its ignition temperature and carbon dioxide cuts off the supply of air to the combustible substances.<\/p>\n

      (ii) Hydrocarbon fire extinguishers:
      \nIt is based on the principle of covering burning material and cut off of oxygen supply to the fire. In this fire extinguisher sodium bicarbonate comes out under pressure in the form of a foam. The foam covers the whole surface of oil. It cuts off the supply of air and the fire is controlled.<\/p>\n

      \"Combustion<\/p>\n

      Question 2.
      \nWhat are the harmful effects of fuel consumption on the environment ? Describe.
      \nAnswer:
      \nThe increasing fuel consumption has the following harmful effects on the environment.<\/p>\n

        \n
      1. Carbon fuels like wood, coal, petroleum release unburnt, carbon particles. These particles are dangerous pollutants causing respiratory diseases, such as asthma.<\/li>\n
      2. Incomplete combustion (combustion in insufficient supply of oxygen or air) forms carbon monoxide gas. It is a very poisonous gas.<\/li>\n
      3. Combustion of most fuels releases carbon dioxide in the environment. Increased percentage of carbon dioxide in the air is believed to cause global warming.<\/li>\n
      4. Burning of coal and diesel releases sulphur dioxide gas. It is an extremely Suffocating and corrosive gas.<\/li>\n
      5. Petrol engines are responsible for the formation of nitrogen oxide gas.<\/li>\n<\/ol>\n

        Hope the knowledge provided regarding the Combustion and Flame Class 8 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.<\/p>\n","protected":false},"excerpt":{"rendered":"

        Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science Question bank on a regular basis. Class 8 Science Chapter 6 Extra …<\/p>\n

        Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[7],"tags":[],"yoast_head":"\nCombustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/combustion-and-flame-class-8-extra-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"Combustion and Flame Class 8 Extra Questions and Answers Science Chapter 6 PDF are solved by experts and will guide students in the right direction. 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