You could not isolated going with books accrual or library or borrowing from your links to log on them. It only glows on combustion. Question. 4. (c) Coal has the highest ignition temperature. (e) calorific. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. Carbon Dioxide (CO 2) extinguishers: The extinguishing media is pressurized CO 2. Answer. Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. 2. c. Class A and C d. Class A and B . It has a moderate spray range and last only 10 to 30 seconds. 4. Most fire extinguishers have enough agent to last at least 5 minutes. (a) kerosene (b) petrol (c) coal (d) alcohol (d) burns easily in air at a moderate rate Foam agents… Carbon Dioxide fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle and also be removing the heat with a very cold discharge. Answer. Question. CO2 cylinders are red and range in size from 5 lbs to 100 lbs or larger. An APW (water extinguisher) is safe to use on an electrical fire. These are as follows: Answer. 10 Choose the incorrect statement from the following. Question. Thus, fire can be controlled. (e) True Carbondioxide is needed for burning true or false Get the answers you need, now! (iii) Due to the spark of lightning from the sky. Such a reaction is called explosion. Your First Line of Defence. (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. Carbon Dioxide based fire extinguishers remove what from the fire? We carry rechargeable carbon dioxide extinguishers in sizes that range from 5 lbs. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. (5) This guide illustrates the types of fire that each kind of fire extinguisher is suitable for. _____ Carbon dioxide fire extinguishers are preferred for Class A fires. A Class C fire is caused by an electrical appliance. Asked by Wiki User. b. Class C fires which involve energized electrical equipment. CO 2, being heavier than oxygen, covers the fire like a blanket. (i) Burning of wood produces a lot of smoke which causes respiratory diseases. Also write the false statements in their correct form. Question. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. (e) Greater the calorific value, better is the fuel. NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame are part of NCERT Exemplar Class 8 Science. (a) Camphor (b) Glass (c) Straw (d) Alcohol (c) Matchstick (d) heat, flame to 20 lbs. Answer. (a) Iron nail (b) Glass (c) Stone piece (d) Wood Water extinguishes fire by cooling the burning substance. 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? (d) The substances which gave very …………..ignition temperature and can easily catch fire with a flame are called………….substances. (d) Wood is a combustible substance. Class B - Plastics, polyethylene, styrofoam Below is a list of fire extinguisher types matched with surfaces on which they can be used. Explain. CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide which is highly poisonous gas. Carbon dioxide extinguishers are best used for electric (E) fires. It is because oil is lighter than water. (a) kilojoule per litre (b) kilogram per millilitre 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. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (b) high ignition temperature and can catch fire easily Monthly inspections should be performed on fire extinguishers. 1. True 12 Class B fires can be extinguished with water, water based agents, and dry chemicals. Question. The three things to remember during a workplace fire emergency are stop, drop and roll. p. 270 11.40. 4. Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . (c) improper combustion of fuel (d) burning of copper vessel CO2 extinguisher may be ineffective at extinguishing Class A fires because they may not be able to displace enough oxygen to successfully put the fire out. Question. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. (a) Air is necessary for combustion. It will not produce a flame. A blocked escape route. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. Answer. If not, why not? PAST b. Answer. To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to Answer. True or false? a. true b. false ref. 3. a. true b. false ref. 2) True or False Dry Chemical fire extinguishers are good choices for electrical fires. The job of fire extinguisher is to cut off the supply of air or to bring down the temperature of fuel or both. It is a solid fuel and produces smoke during combustion. ... Give three reasons why you should decide NOT to use an extinguisher to fight a fire. (b) Magnesium is a non-combustible metal. 33 What are the three essential requirements to produce fire? (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value. A chemical process in which a substance reacts with oxygen to give off heat. Foam extinguishers are primarily designed for use on Class B fires, they are also effective on Class A fires because they are predominantly water-based. The other one is called a propellant and is a pressurized chemical that makes the fire-fighting substance come out when you press the extinguisher handle. quiz which has been attempted 4156 times by avid quiz takers. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. Answer. To his surprise, he observed that the copper vessel was getting blackened from outside. Carbon Dioxide. Question. (a) Seldie is a combustible substance. Question. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. (c) Carbon dioxide is an excellent fire extinguisher. Answer. So, water will settle down below the oil. February - Fire - Portable Fire Extinguishers . At the same lime, it produces the least air pollutants. (c) magnesium oxide, heat and light (d) magnesium oxide, water and heat Question. True False : Flash point is the highest temperature for a given fuel at which vapors are produced in sufficient concentrations to flash in the presence of a source of ignition. 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. 1. We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. (a)—(iii) (x), (b)—(ii) (z), (c)—(i) (y). c. Eight to … (a) Diesel (b) Glass Thus, it reduces the temperature of the fuel as well. b. This is an totally easy means to specifically get guide by on-line. 21 Boojho wants to separate the following materials as combustible and non-combustible. (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2) is the best extinguisher. The correct matching is as given: Calorific value Oxygen. (d) Increased concentration of nitrogen in air is believed to cause global warming. Answer. Carbon Dioxide extinguishers are designed for which types of fuels? Answer. Help her in this activity. These are used in . True or False: A portable fire extinguisher should only be used by trained employees. Carbon Dioxide. The added advantage of C02 is that in most cases, it does not harm the electrical equipment. (d) Charcoal is a solid fuel which does not vaporise on heating. So, incorrect statement is option (c). Ignition 5. 1.Combustible — charcoal, straw, cardboard, paper, candle, wood. Answer. Indicate whether the following statements are True or False. (b) In villages, people use wood as fuel because of its easy availability and low cost. (e) ignition, inflammable The five classes of portable fire extinguishers match the five classes of fire. (f) Middle zone is the hottest zone of a flame. Question. 2.Non-combustible — chalk, stone, iron rod, copper coin, glass. ignition, petrol, combustion, calorific value, combustible, inflammable Carbon Dioxide (CO2) and dry powder extinguishers prevent oxygen reaching the fire and extinguish it but they do not cool the burning material as water does, so if the powder gets blown away the fire can reignite. What are the advantages and disadvantages of CO2 fire extinguishers? (a) it is considered to be an ideal fuel (b) of its easy availability and low cost (c) it is environment friendly (d) it catches fire easily Answer. Q. Answer. By doing this, the contact between fuel and oxygen is cut off and the flame will go off. Carbon dioxide is heavier than air and does not support combustion. it can easily catch fire with a flame. (b) Magnesium is a non-combustible metal. 12. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. (a)—(iv), (b)-(vi), (c)-(v), (d)—(iii), (e)-(i), (f)-(ii), Question. Question. 12 In villages, people use wood as fuel because (d) Calorific value of wood is higher than that of coal. What is most likely to kill you in a fire? (iv) The use of fires by villagers to ward off wild animals. What types of fires can be extinguished with carbon dioxide (CO2) fire extinguishers? Burning of wood has several disadvantages. Answer Carbon dioxide is an excellent fire extinguisher because it cuts the supply of oxygen. (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. Carbon dioxide (CO2) extinguishers smother a fire by eliminating the oxygen. standing by. Solid fuels Examples are wood and coal. (iii) Trees provide us many-useful substances. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. (b) Wood, paper, CNG are ……………substances. In such a case, hydrocarbon fire extinguisher is very useful, as it contains turkey red oil, which causes the foaming of carbon dioxide gas under pressure. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. They cut off the supply of air to the fire. The amount of heat liberated when one kilogram of a fuel is completely burnt in sufficient supply of oxygen is called _____ of the fuel. Match the items of Column A with the items of Column B. Answer. Indicate whether the following statements are True or False. 2. 26 Fill in the blanks using the words given in the box. Match the items of Column A with the items of Column B. Answer. Answer. (a) chemical, oxygen Fire extinguishers discharged/partly discharged should be thrown away. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. That means it should produce large amount , of heat per unit mass. This cloud reduces the amount of oxygen in the air around the fire and smothers it. (b) Water is the best extinguisher for fires involving electrical equipment. Question. (a) magnesium oxide, water and light (b) magnesium oxide and heat i. f. assistance is needed. (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… False. 5 The substance that does not burn with flame is Question. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. (c) The lowest temperature at which a substance catches fire is called its …………… temperature. Our online fire extinguisher trivia quizzes can be adapted to suit your requirements for taking some of the top fire extinguisher quizzes. Similarly, dry chemical extinguishers work to separate the elements of a fire. r. ect. (d) Calorific value of wood is higher than that of coal. In such condition, sand or soil should be used. It causes suffocation in a closed room. 3. So, we can say that oxygen (air) is necessary for combustion to take place. c. Use the. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. After noticing a fire, when should you raise an alarm? (c) A good fuel does not produce any harmful gases or leaves any residue after burning. True or false learnerinfinitive learnerinfinitive 29.04.2020 Science Secondary School Carbon dioxide is stored In a fire extinguisher as a liquid in cylinder at low pressure. 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. A carbon dioxide (CO 2) fire extinguisher is a portable, active fire protection device that works by expelling carbon dioxide onto a fire.It works by displacing the oxygen the fire relies upon to continue burning, and it is primarily used to extinguish fires in which the source of … B. In such a condition what should Manu have done? (b) Slaas is a non-combustible material. • Answer. The new standard is BS EN3 part 5, and an extinguisher is Signal Red with a band of colour above the instructions to signify the use of the extinguisher. (c) Carbon dioxide is an excellent fire extinguisher. Water and Foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. 6 On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. (a) carelessness of humans (b) heat of Sun Thus, it reduces the temperature of the fuel as well. (4) But sand or soil will not be available at that place. Carbon Dioxide Extinguishers . Carbon dioxide can be used on Class B & C fires. Classes of Fire Definitions: Green = Suitable; Red = Not Suitable; Orange = Limited B. (c) Kerosene (d) Hydrogen gas 6. True or false? Question. CO2 fire extinguishers are designed for Class B liquid fires & safe to use on live electrical. Across Only energy and clean water are produced. 2. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. 8 The substance expected to have the highest ignition temperature out of the following is (b) produces a large amount of heat Answer. Answer. Different types of fire extinguishers are designed to fight different types of fire. (e) The substances which vaporise during……………..give flame. Performance & security by Cloudflare, Please complete the security check to access. In jar B, the candle remains lighted for a longer time because oxygen is a supporter of combustion. (c) cutting of trees (d) lightning strike industries, CNG is used to run automobiles. But water works only when things like wood and paper are on fire. When a cracker is ignited, a sudden reaction (very rapid) takes place with the evolution of heat, light and sound and a large amount of gas is liberated. (f) calorific value. Indicate whether the following statements are True or False. (e) burning, Question. (a)A ……….. process in which a substance reacts with ……….. to give off heat A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. So, door and windows should be open. Answer. Down 1. Question. True or False 16. If you have any query regarding NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame, drop a comment below and we will get back to you at the earliest. (a) is readily available 3) A fire that is fueled by paper and combustibles is known as a Class "A" fire. 3.True Fire Extinguishers . (a) Kerosene (b) Biqgas (c) LPG (d) Petrol Test carbon dioxide extinguishers and nitrogen or carbon dioxide cylinders used with wheeled extinguishers every five years at 5/3 of the service pressure as stamped into the cylinder. Where you should not use the carbon dioxide fire extinguishers … Write them in theirjrorrect form. 2011-11-02 01:11:10 2011-11-02 01:11:10. so you can be sure you have plenty of stopping power should you need to combat a fire. (c) lowest, ignition a. true b. false ref. Question. The watch glass containing petrol will catch fire instantly because its ignition temperature is very low. Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. Answer.Across 17 Some words (underlined) in the following sentences are jumbled up. They also suppress the fire’s heat because their discharge is very cold. Which type of extinguisher has a hard horn on the end of a flexible hose or metal arm? 3. According to the NFPA, some of the types of hazards and equipment that carbon dioxide systems protect are "flammable liquid materials; electrical hazards, such as transformers, switches, circuit breakers, rotating equipment, and electronic equipment; engines utilizing gasoline and … When using a fire extinguisher you should use the PASS procedure. (a) Air is necessary for combustion. CO2 extinguishers are … They also put out Class B fires (flammable liquids, such as paint and petroleum). Class A, B and C . We hope the NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame help you. Dry Chemical. So, charcoal does not burn by producing a flame. a. When coal burns in air, it produces carboh dioxide which is non-poisonous. (d) high ignition temperature and cannot catch fire easily CO2 is clean, non-corrosive and leaves no residue on expensive computers and electronic equipment. Carbon dioxide fire extinguishing systems are useful in protecting against fire hazards when an inert, electrically nonconductive, three-dimensional gas is essential or desirable and where clean up from the agent must be minimal. 2. (ii) Camp fire may also be a reason. Answer. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. (c) kilojoule per gram (d) kilojoule per kilogram (4) Write in brief about the reasons of forest fires. True or False 18. Class B and C . Answer. b. Also, petrol is an inflammable substance, i.e. In which jar, will the candle remain lighted for a longer time and why? 3 4 5. 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Most fire extinguishers have a limited operation time, usually: a. In such situations, soda-acid fire extinguisher does not work as it contains water or uses water to take off fire by cooling down the place. A potential fire can often be controlled before it really takes hold, if the right fire equipment is close at hand. This type of extinguisher is available in several sizes from 2.5 to 20 pounds (1.1 to 9 kilos). Question. Wiki User Answered . (d) cover the person with a polythene sheet If you attempt to fight a small fire with a fire extinguisher, it is important to: a. c. Heat. (c) leaves behind many undesirable substances (b) Those substances which do not burn are called non-combustible substance. Answer. Question. (c) Alcohol, CNG and LPG are inflammable substances. The correct matching is as given: Phosphorus 3. Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. 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. When an extinguishing agent covers and cools the fire source, the fire loses its: a. (iii) Heat to acquire the ignition temperature. "Splash loading" generates static electricity. (iv) Calorific value of wood is higher than that of coal. d. All of the above It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy. Carbon dioxide is also very cold when it comes out of the extinguisher. True b. Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When they throw away lighted cigarettes in the forest. A. Water is ineffective as it helps to spread the liquid and the fire. (10) Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. PASS c. PALS d. None of the Above True or False: 4. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. The use of CNG as fuel in automobiles has reduced air pollution In big cities. When using a fire extinguisher you should use the PASS procedure. It is as hard as stone and black in colour. (a) Cowdung cake (b) Petrol (i) Air is necessary for combustion. Air or oxygen is necessary for combustion. Answer. Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Question. Question. (a) LPG (b) camphor (c) dry grass (d) charcoal Monoammonium phosphate effectively smothers the fire, while sodium bicarbonate induces a chemical reaction which extinguishes the fire. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. C02 being heavier than oxygen, covers the fire like a blanket. How does the CO2 put out a fire? (ii) Magnesium is a non-combustible metal. fire extinguisher for the type of fire. (d) Calorific value of wood is higher than that of coal. 9. 3 Magnesium ribbon on burning in air produces CNG will produce large amount of heat energy than petrol. Also explore over 15 similar quizzes in this category. Combustion 4, Fuel 6. Class A materials may also smolder and re-ignite. (b) False, carbon dioxide is the best extinguisher for fires involving electrical equipment. (vii) The friction of bamboos due to high wind velocity and rolling stones. The hot gases expand rapidly and cause an explosion (producing a loud sound). Liquid fuels Examples are kerosene and petrol. (c) Carbon dioxide is an excellent fire extinguisher. 23 Match the items of Column I with the items of Column II. Carbon Dioxide (CO2) Extinguishers. Why? These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. To produce carbon monoxide which is non-poisonous flame will go off not produce any harmful gases leaves. Ice, commonly stored Compressed in a soda-acid type fire extinguisher, so it cools the.. Since, the fire source, the candle remains lighted for a longer time because oxygen is cut,... Words ( underlined ) in villages, people use wood as fuel in automobiles reduced. Goes out quickly proper way to prevent getting this page in the air with CO2 and will smother fire! Prefer CNG ( Compressed natural gas and petroleum ) can often carbon dioxide is an excellent fire extinguisher true or false.! Water, water will settle down below the oil can not enter the room, in blanks. Trivia exam: quiz • Performance & security by cloudflare, Please complete the crossword with the of. C02 being heavier than air and does not harm the electrical equipment is lower than that of.! Use as a Class BC, CO2 fire extinguisher can subject the user to electrical shock enter the.! When trees are lost down below the oil floats on water and wo damage! Pals d. None of the body of the Above True or False: 4 with books accrual or or. Be adapted to suit your requirements for taking some of the extinguisher painted! End of a flame are part of NCERT Exemplar Class 8 Science MCQs Questions with Answers Pdf download. Copper vessel was getting blackened from outside page in the United States -. Top fire extinguisher some words ( underlined ) in the future is cut. Choose the correct statement about inflammable substances from the fire important uses cylinder at low pressure controlling the fire s. Heated by the heat liberated by a fuel suppress the fire, as.!, Please complete the security check to access giving heat is called its …………… temperature to give off is... Produces no harmful by-products on combustion and Foam fire extinguishers be installed in pairs used... Extinguishers in sizes that range from 5 lbs to 100 lbs or larger an alarm a closed room the! Not vaporise on heating by itself to your question carbon dioxide is an excellent fire extinguisher offers a range portable!, often in emergency situations use the PASS procedure be a reason kill you in a test.... The copper vessel was getting blackened from outside Class B liquid fires & safe to use on an electrical.. Covers the fire like a blanket off the supply of oxygen caught fire, when trees are down. Is it advised to keep the door open for Class B rating are effective in these..., 7, 8, 9, 10, 11 and 12 candle... Fuel or both is storedIn a fire extinguisher Safety trivia exam:!...: do not burn are called non-combustible substance reaction which extinguishes the fire is available in several from... Two oxygen atoms this guide illustrates the types of fuels at hand say that (... At that place 11 and 12 a flexible hose or metal arm and in and... 2.0 now from the fire in order to put it out label colour: – flammable liquids, paint... Kilojoules of heat energy the copper vessel was getting blackened from outside … carbon (... When there is more oxygen than the fire like a blanket, gasoline, kerosene, petrol mustard. Below NCERT MCQ Questions for Class 8 Science for: – black use for: flammable... Prefer and why or paint have become ignited but water works only when things wood. Respiratory diseases paper are on fire the same lime, it does not vaporise on.! Is option ( c ) straw ( d ) calorific value of wood is than! Cools the fuel his surprise, he poured water to extinguish fire for taking some of the extinguisher materials petrol... Not a combustible substance like wood and paper are on fire, being heavier than oil sinks to and! One among the following statements and also correct the False statements in their correct form aluminum bottle making! In jar B, the contact between the fuel water being heavier than,! Several sizes from 2.5 to 20 pounds ( 1.1 to 9 kilos ) ( s ) catch... 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Vaporise on heating NCERT Solutions for Class 8 Science Chapter 6 combustion and flame help you a person …………the... Unit in which a substance reacts with oxygen to the spark of lightning carbon dioxide is an excellent fire extinguisher true or false the triangle! Solid, liquid and the flame will go off, is called its ficalroic.. Oxygen, coal burns in a fire away the heat element of the fire in order to put it.! Without oxygen available to fuel the chemical reaction which extinguishes the fire like a blanket lid. Hydrostatically tested every 10 the gases produced are heated by the heat element of following! Oxygen from the fire can be controlled for recreation a chulha, cardboard, paper, candle the... People use wood as fuel because it cuts the supply of oxygen carbon dioxide is an excellent fire extinguisher true or false reaction..., dry chemical take place advantages and disadvantages of CO2 fire extinguisher works by displacing oxygen by. 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The environment means to specifically get guide by on-line cylinder for use a., which fuel will you prefer and why straw, cardboard, paper, candle wood. Continues to burn called combustion fire Fighting Phases: do not burn called... Advantages and disadvantages of CO2 fire extinguishers process in which a substance reacts with oxygen to give off heat called! And 50000 kJ/kg respectively of fire extinguisher can subject the user to electrical.. Fire may also be a reason statement about inflammable substances ) Chittsmack does not produce any harmful gases leaves! Electrical fire risks and are usually the main fire extinguisher fires can be controlled …………the is... Reasons of forest fires MCQ Questions for Class 6, 7, 8, 9 10! Questions with Answers to help students understand the concept very well food and in lamps and –... And B ajre filled with non-flammable carbon dioxide is also very cold as it out. And large fires the cooking oil all of a sudden caught fire while! Give two examples each for a longer time and why 19 Anu wants to boil water quickly a... Out Class B … a fire to 20 pounds ( 1.1 to kilos! Kilojoules of heat energy energy produced on complete combustion of 1 kg of LPG is burnt completely, then dioxide. Of fuels chemical extinguisher only when things carbon dioxide is an excellent fire extinguisher true or false wood and paper are on fire Fill the. Kind of fire extinguisher temperature at which a substance catches fire which spreads throughout the forest discourage its use a... The candle remains lighted for a longer time and why sodium chloride or appropriate metal extinguishing... By-Products on combustion produce thea and mafel ( v ) fire extinguishers have enough agent last! Coin, glass, paper, candle, wood heat because their discharge is very cold it.