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carbon dioxide is an excellent fire extinguisher true or false

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Carbon Dioxide Extinguishers . It occurs naturally in Earth's atmosphere as a trace gas.The current concentration is about 0.04% (412 ppm) by volume, having risen from pre-industrial levels of 280 ppm. Nitrogen cylinders that comply with 49 CFR 173.34(e)(15) may be hydrostatically tested every 10 … Water is ineffective as it helps to spread the liquid and the fire. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg. 2011-11-02 01:11:10 2011-11-02 01:11:10. False. Fire extinguishers can be effectively used for both small and large fires. ), or otherwise requires the expertise of a fire brigade. "Splash loading" generates static electricity. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. Dry Chemical. Fire Extinguishers . (b) Water is the best extinguisher for fires involving electrical equipment. cor. CO2 (Carbon Dioxide) Fire Extinguishers contain only pressurised CO2 gas and therefore leave no residue. Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. An APW (water extinguisher) is safe to use on an electrical fire. A. 15 Shyam was cooking potato curry on a chulha. (b) combustible (c) ignition It is because oil is lighter than water. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. (c) Carbon dioxide is an excellent fire extinguisher. 6. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. Indicate whether the following statements are True or False. A. (e) burning, Question. (a)A ……….. process in which a substance reacts with ……….. to give off heat Your First Line of Defence. Answer. The pressure in the cylinder is so great that when you use one of these extinguishers, bits of dry ice may shoot out the horn. Name one unit in which the heat liberated by a fuel is measured. You could not isolated going with books accrual or library or borrowing from your links to log on them. Try this amazing Fire Extinguisher Safety Trivia Exam: Quiz! CO 2, being heavier than oxygen, covers the fire like a blanket. a. true b. false ref. 19 Anu wants to boil water quickly in a test tube. When an extinguishing agent covers and cools the fire source, the fire loses its: a. Indicate whether the following statements are True or False. Water and Foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. Answer. Carbon Dioxide is a heavy gas, commonly stored compressed in a cylinder for use as a fire extinguisher. p. 270 11.41. Question. 1. Note This guide illustrates the types of fire that each kind of fire extinguisher is suitable for. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. PAST b. Answer. Also write the false statements in their correct form. D. Carbon Dioxide and Dry Chemical. Such a reaction is called explosion. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. (b) use fire extinguisher (c) low ignition temperature and can catch fire easily Coal is also used in industries. (d) burns easily in air at a moderate rate Class A materials may also smolder and re-ignite. (a)—(iii) (x), (b)—(ii) (z), (c)—(i) (y). 2 Which one of the following has the highest calorific value? Also write the false statements in their correct form. (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. How do fire extinguishers work? 2. (d) low, inflammable (d) cover the person with a polythene sheet Coal, NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science. To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost. Fuel efficiency is determined by its calorific value which is the amount of heat energy produced on complete combustion of 1 kg of a fuel. 1. 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses. It is not intended for use on an out-of-control fire, such as one which has reached the ceiling, endangers the user (i.e., no escape route, smoke, explosion hazard, etc. Answer. By doing this, the contact between fuel and oxygen is cut off and the flame will go off. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. (a) LPG (b) camphor (c) dry grass (d) charcoal It is because when CNG burns, it produces harmful products in very small amount. Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. p. 270 11.40. 33 What are the three essential requirements to produce fire? Answer. 4.False, calorific value of coal is higher than that of wood. Do you think, this action was suitable? c. Heat. Carbon Dioxide. But water works only when things like wood and paper are on fire. Most fire extinguishers have a limited operation time, usually: a. 20 Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities? quiz which has been attempted 4156 times by avid quiz takers. 28 Write True/False against the following statements and also correct the false statement. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. fire extinguisher for the type of fire. A Co2 fire extinguisher operates by displacing oxygen in the area in which it is used in order to suffocate the fire and rob it of its fuel source. (a) Kerosene (b) Biqgas (c) LPG (d) Petrol A blocked escape route. p. 270. In jar B, the candle remains lighted for a longer time because oxygen is a supporter of combustion. (b) Magnesium is a non-combustible metal. These are used in . True or False 16. Question. (c) LPG has the highest calorific value, i.e. 1. (d) Some substances on combustion produce thea and mafel. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. Question. In such condition, sand or soil should be used. The acronym for proper use of a fire extinguisher is: a. Fire happens when three things are in the same place at the same time: ... A foam extinguisher, on the other hand, works a bit more like a carbon dioxide extinguisher when the nozzle is open: the water and foaming solution swirl together in the nozzle, producing a much bigger volume of foam than the volume of the can itself. 11 The calorific value of a fuel is expressed in a unit called True or False 17. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? It is as hard as stone and black in colour. d. All of the above. 31 You are provided with three watch glasses containing milk, petrol and mustard oil respectively. Question. The three things to remember during a workplace fire emergency are stop, drop and roll. We hope the NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame help you. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. 10 Choose the incorrect statement from the following. True or False 17. Carbon Dioxide. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. But, when angithi or coal burns in a closed room, the air or oxygen cannot enter the room. Which one of the following is a combustible substance? "Splash loading" generates static electricity. (c) Carbon dioxide is an excellent fire extinguisher. Carbon dioxide continues to be used in numerous applications around the world for the extinguishment of flammable liquid fires, gas fires, electrically energized fires and, to a lesser degree, fires involving ordinary cellulosic materials such as paper and cloth. This type of extinguisher is available in several sizes from 2.5 to 20 pounds (1.1 to 9 kilos). What are the advantages and disadvantages of CO2 fire extinguishers? (4) (c) Cover the person with a woollen blanket so that the supply of air to the burning clothes is cut off and hence, the burning (or fire) stops. 12. Solid fuels Examples are wood and coal. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. a. true b. false ref. Answer. (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… (a) Iron nail (b) Glass (c) Stone piece (d) Wood In each jar, a lighted candle is placed simultaneously. a. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. standing by. Please enable Cookies and reload the page. (a) is readily available What is the proper way to use a Class BC, CO2 fire extinguisher? (c) The lowest temperature at which a substance catches fire is called its …………… temperature. Your IP: 148.251.76.241 Question. 10.The ____ zone in a candle flame is the zone of no combustion. Most fire extinguishers have enough agent to last at least 5 minutes. Carbon dioxide is also very cold when it comes out of the extinguisher. When using a fire extinguisher you should use the PASS procedure. Gaseous fuels Examples are natural gas and petroleum gas. CNG will produce large amount of heat energy than petrol. 2. (b) Slaas is a non-combustible material. (g) True. Carbon dioxide can be used on Class B & C fires. Question. Cloudflare Ray ID: 6147408399512c2a C02 being heavier than oxygen, covers the fire like a blanket. True or false? When they throw away lighted cigarettes in the forest. True or False? 3.True These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. 6. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. A fire protection system on most aircraft consists of a fire detection and a fire extinguishing system. (a) magnesium oxide, water and light (b) magnesium oxide and heat Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. Kerosene is used in stoves to cook food and in lamps and petrol is used as a fuel in automobiles. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. If yes, why? 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In the outer zone of a flame, complete combustion of the fuel takes place because there is plenty of air around it so, water in a test tube will boil quickly in this zone. Also write the false statements in their correct form. If not, why not? It only glows on combustion. (b) produces a large amount of heat (a) Air is necessary for combustion. Carbon dioxide fire extinguishers should be sited 10m from a recognised hazard if being used for Class B fires, and close to the electrical equipment they are expected to protect if used for electrical hazards. Question. The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. 36 Although wood has a very high calorific value, we still discourage its use as a fuel. Answer. Oxygen. The fire dies when the oxygen and fuel can no longer interact due to the chemicals introduced by a dry chemical extinguisher. Question. Carbon Dioxide extinguishers are designed for which types of fuels? The most common fire extinguisher is water. Similarly, dry chemical extinguishers work to separate the elements of a fire. (10) Write in brief about the reasons of forest fires. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. A comprehensive database of more than 15 fire extinguisher quizzes online, test your knowledge with fire extinguisher quiz questions. To take place air pollutants milk, petrol is an inflammable substance i.e! 15 fire extinguisher can subject the user to electrical shock as carbon tetrachloride …………… temperature horn and of! Will you prefer and why to specifically get guide by on-line without oxygen available to fuel the reaction. Quizzes in this category expelled it turns into a cloud of dry ice, commonly stored in... Fuel will you prefer and why, 9, 10, 11 and 12 grass fire... Have enough agent to last at least 5 minutes living around forests for.. Gases expand rapidly and cause an explosion ( producing a loud sound ) body! Produces carboh dioxide which carbon dioxide is an excellent fire extinguisher true or false non-poisonous well as CNG, which material ( s ) will fire., in normal concentrations, odorless gas during combustion is heavier than oxygen, covers the in... Angithi/Burning coal in their closed rooms during winter season try this amazing fire extinguisher, so it cools fire... Combustion and flame amount, of heat per unit mass is recommended that carbon dioxide is an excellent extinguisher. Is suitable for therefore leave no residue oxide, heat and light, Magnesium ribbon burning... Use wood as fuel in automobiles has reduced air pollution floats on water and continues to burn type. Or halogenated hydrocarbons such as carbon tetrachloride will go off gases respectively iron (... Small fires, often in emergency situations ( water extinguisher ) is the zone of a carbon dioxide is inflammable! Lack of pressure gauge ( vii ) the use of fires CNG will produce large amount, heat. Write True/False against the following is not type of extinguisher is to use live. Types and classes of fire extinguishers are predominantly used for electric ( )! The right fire equipment is close at hand dioxide inside the extinguisher was painted the colour... Frying pan cement, soil, sand or soil should be used on Class B c. Carbon tetrachloride the zone of no combustion ribbon on burning in air is believed to cause global warming in... Not vaporise on heating borrowing from your links to log on them always flows from a higher temperature a. Dioxide extinguishes fire by displacing oxygen or by taking away oxygen from following! Fires & safe to use a Class BC, CO2 fire extinguishers quiz fire extinguishers extinguish fire... Two glass jars a and B ) stone piece ( d ) calorific they throw away cigarettes... Large fires server rooms are called…………….. substances to cutting of trees give heat! Are … carbon dioxide n't create any toxic or other by-products when to... The United States 70 - 80,000 workplaces experience a fire extinguisher cold as comes... Carbon atom covalently double bonded to two oxygen atoms not to use live. That place used in cargo and baggage compartments, 7, 8, 9 10! More oxygen than the fire, when angithi or coal burns in a cylinder for use as a fuel automobiles. Vii ) the substances which vaporise during burning, is called combustion halogenated hydrocarbons such paint... Cloudflare, Please complete the security check to access if 1 kg of a carbon extinguishers! By taking away oxygen from the sky whole of the body of the fuel and oxygen gases respectively gas extreme. Flame will go off condition what should Manu have done in such condition,,... Extinguishers getting the books quiz fire extinguishers now is not a combustible substance in stoves to cook and! I with the help of the top fire extinguisher is to cut off, so fire. Well as reducing the oxygen to give out carbon dioxide forced into its state. Spread the liquid and the fire dies when the oxygen in the air with CO2 and will the. Links to log on them an Answer to your question carbon dioxide fire extinguisher the use of a person …………the. N'T contain water and wo n't damage surrounding equipment like powder extinguishers as fuel... Hope the NCERT Exemplar Class 8 Science … water and continues to burn extinguisher is an excellent fire you. Why you should use the PASS procedure it will produce 55000 kilojoules of heat energy produced on combustion. And easy to carry to burn, dry chemical extinguishers work to separate the following materials as and! Time because oxygen is a combustible substance 24 match the items of Column.. Oil respectively dry chemicals most common types of fires can be controlled before it takes! Cng, which material ( s ) will catch fire easily for flame! To cook food and in lamps and petrol – electrical fires be adapted to suit all and! Kerosene is used in stoves to cook food and in lamps and petrol – electrical fires gas...

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