1 A substance which reacts with oxygen giving heat is called a combustible substance. Explain. It is because oil is lighter than water. Question. PASS c. PALS d. None of the Above True or False: 4. As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". They also suppress the fire’s heat because their discharge is very cold. Answer. (g) The substances which vaporise during burning, give flame. Performance & security by Cloudflare, Please complete the security check to access. Also, petrol is an inflammable substance, i.e. Classes of Fire Definitions: Green = Suitable; Red = Not Suitable; Orange = Limited (c) Matchstick (d) heat, flame CNG will produce large amount of heat energy than petrol. Carbon dioxide (chemical formula CO 2) is a colorless gas with a density about 53% higher than that of dry air. True or False 18. C. Water. The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. 4. True, air contains oxygen and oxygen is a supporter of combustion. True or False 17. 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. "Splash loading" generates static electricity. CO2 (Carbon Dioxide) Fire Extinguishers contain only pressurised CO2 gas and therefore leave no residue. Down Note Thus, fire can be controlled. True or false 1 See answer learnerinfinitive is waiting for your help. Question. Across We carry rechargeable carbon dioxide extinguishers in sizes that range from 5 lbs. Question. 28 Write True/False against the following statements and also correct the false statement. CO2 is clean, non-corrosive and leaves no residue on expensive computers and electronic equipment. 2. Do you think, this action was suitable? Most fire extinguishers have a limited operation time, usually: a. 10 Choose the incorrect statement from the following. Solid fuels Examples are wood and coal. Fire extinguishers can be effectively used for both small and large fires. It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy. Answer. (d) cover the person with a polythene sheet Non-metal which catches fire if exposed to air. (iii) Trees provide us many-useful substances. One to two minutes. What is the proper way to use a Class BC, CO2 fire extinguisher? The added advantage of C02 is that in most cases, it does not harm the electrical equipment. To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost. A Class C fire is caused by an electrical appliance. Top Answer. (ii) The cutting down of trees to obtain as a wood fuel leads to deforestation which is very harmful to the environment. February - Fire - Portable Fire Extinguishers . so you can be sure you have plenty of stopping power should you need to combat a fire. to 20 lbs. False. Answer. (d) burns easily in air at a moderate rate By doing this, the contact between fuel and oxygen is cut off and the flame will go off. 20 Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities? Question. i. f. assistance is needed. (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. Liquid fuels Examples are kerosene and petrol. Answer. Fire Extinguisher Quiz Thursday, March 08, 2001 1) True or False Carbon Dioxide ( CO 2) extinguishers can be used for all fires. 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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. Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. (vi) Fires started accidentally by careless visitors to forests. C02 being heavier than oxygen, covers the fire like a blanket. 3.True When using a fire extinguisher you should use the PASS procedure. (a) chemical, oxygen The use of CNG as fuel in automobiles has reduced air pollution In big cities. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. 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. (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. 11 The calorific value of a fuel is expressed in a unit called Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Answer Carbon dioxide is an excellent fire extinguisher because it cuts the supply of oxygen. Similarly, dry chemical extinguishers work to separate the elements of a fire. As Carbon Dioxide (CO2) is a non-conductive & non-corrosive gas, it is the perfect solution for protecting computer & electrical equipment in the event of a fire. In a soda-acid type fire extinguisher, _____reacts with sulphuric acid to give out carbon dioxide. (a) combustion b. CO2 is a colorless and, in normal concentrations, odorless gas. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. a. true b. false ref. 19 Anu wants to boil water quickly in a test tube. 3 Magnesium ribbon on burning in air produces ... Give three reasons why you should decide NOT to use an extinguisher to fight a fire. Petrol is used as a ………….. in automobiles. Find an answer to your question carbon dioxide is storedIn a fire extinguisher as a liquid in cylinder at low pressure. This 5-pound extinguisher has an aluminum bottle, making it lightweight and easy to carry. (f) Middle zone is the hottest zone of a flame. Which one of the following is a combustible substance? 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg. Coal is also used in industries. (b) Slaas is a non-combustible material. Add your answer and earn points. 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. The lowest temperature at which a substance catches fire is called its …………. 4 Which of the following is not a combustible substance? (b) Wood, paper, CNG are ……………substances. Some fire extinguishers contain carbon dioxide stored under very high pressure.Use the first law of thermodynamics to explain why some carbon dioxide solidifies as … p. 270. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? Answer. 37 Forest fire produces a lot of air pollution. 3 4 5. 2) True or False Dry Chemical fire extinguishers are good choices for electrical fires. When coal burns in air, it produces carboh dioxide which is non-poisonous. That means it should produce large amount , of heat per unit mass. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. What is most likely to kill you in a fire? Here we have given NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame. CO2 extinguishers are … Write them in theirjrorrect form. 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. Carbon dioxide is also very cold when it comes out of the extinguisher. industries, CNG is used to run automobiles. 23. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value. It causes suffocation in a closed room. Answer. 9 Choose the correct statement about inflammable substances from the following. (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. Carbondioxide is needed for burning true or false Get the answers you need, now! Answer. They have Pouring water to extinguish the fire due to oil was not suitable action. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2) is the best extinguisher. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. 1. a. (a) Iron nail (b) Glass (c) Stone piece (d) Wood Answer. (d) The calorific value of a fuel is expressed in the unit of kilojoule per kilogram (kJ/kg). Only energy and clean water are produced. They also put out Class B fires (flammable liquids, such as paint and petroleum). Water is one of the most commonly used extinguishing agents for ordinary combustibles. (a) Air is necessary for combustion. Foam agents… An APW (water extinguisher) is safe to use on an electrical fire. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. Q. Fire Extinguishers . (c) kilojoule per gram (d) kilojoule per kilogram 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. Kerosene, petrol and alcohol have low ignition temperature. When used for Class B and C fires, the CO 2 covers the fuel by blanketing it, and stops the reaction at the surface by displacing oxygen. Nitrogen cylinders that comply with 49 CFR 173.34(e)(15) may be hydrostatically tested every 10 … CO2s may be ineffective at extinguishing Class A fires because they may not be able to displace enough oxygen to successfully put the fire out. • (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. A. b. (c) A good fuel does not produce any harmful gases or leaves any residue after burning. (4) The three things to remember during a workplace fire emergency are stop, drop and roll. Question. (a) kilojoule per litre (b) kilogram per millilitre (d) Ignition temperature of……………… is lower than that of wood. Question. 12 In villages, people use wood as fuel because 12. True or False 18. So, charcoal does not burn by producing a flame. Be thorough when using a CO 2 extinguisher. p. 270 11.41. • Answer. (iii) Carbon dioxide is an excellent fire extinguisher. Answer. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. (a) low ignition temperature and cannot catch fire easily (c) cover the person with a woollen blanket 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 … (a) Cowdung cake (b) Petrol Question. (c) magnesium oxide, heat and light (d) magnesium oxide, water and heat (b) Magnesium is a non-combustible metal. (c) Carbon dioxide is an excellent fire extinguisher. (b) fire, blanket B. d. All of the above. Answer. Indicate whether the following statements are True or False. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. Calorific value 30 What do you understand by fuel efficiency? 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. Your IP: 18.104.22.168 The calorific value of a fuel is expressed in kJ/kg. 29 Cracker on ignition produces sound. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. Anu should keep her test tube in the outermost zone or non-luminous zone of the flame because it is the hottest zone of a flame and has more temperature. quiz which has been attempted 4156 times by avid quiz takers. At the same lime, it produces the least air pollutants. False. Question. The carbon dioxide extinguisher pushes oxygen away from the fire and replaces it with carbon dioxide, which is inflammable and more dense than air. Answer. (f) False, outer zone is the hottest zone of a flame. (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 Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. 5. (a) The flame extinguishes because of non-availability of oxygen. 5. Also write the false statements in their correct form. Answer. Question. (a) Air is necessary for combustion. It has a moderate spray range and last only 10 to 30 seconds. It is a solid fuel and produces smoke during combustion. Monthly inspections should be performed on fire extinguishers. True or False 16. Answer. But sand or soil will not be available at that place. This is because of non-availability of (a) oxygen (b) water vapours (c) carbon dioxide (d) wax (c) The………….. temperature at which a substance catches fire is called its…………..temperature. 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 … (ii) Magnesium is a non-combustible metal. d. All of the above Answer. Class A fire extinguishers can be used on electrical fires False ( Class C) While using a fire extinguisher hold the extinguisher firmly and direct it to the middle or main part of the fire 6. Iron wire will become red hot and glow. 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. 12. (c) Coal has the highest ignition temperature. Thus, it reduces the temperature of the fuel as well. (c) improper combustion of fuel (d) burning of copper vessel True or False 17. Carbon dioxide (CO2) extinguishers smother a fire by eliminating the oxygen. Reasons of forest fires are : Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. Also explore over 15 similar quizzes in this category. Usual Shipping Containers: Hermetically sealed … 3) A fire that is fueled by paper and combustibles is known as a Class "A" fire. Answer.Across This type of extinguisher is available in several sizes from 2.5 to 20 pounds (1.1 to 9 kilos). it can easily catch fire with a flame. Answer. Match the items of Column A with the items of Column B. Question. B. 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. Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. Ignition 5. It will not produce a flame. (a) Seldie is a combustible substance. (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. 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. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. If you attempt to fight a small fire with a fire extinguisher, it is important to: a. Where you should not use the carbon dioxide fire extinguishers … The amount of heat liberated when one kilogram of a fuel is completely burnt in sufficient supply of oxygen is called _____ of the fuel. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. 18 Two glass jars A and B ajre filled with carbon dioxide and oxygen gases respectively. Carbon dioxide is produced when there is more oxygen than the fire needs. Use dry graphite, soda ash, powder sodium chloride or appropriate metal fire extinguishing powder. The correct matching is as given: Question. c. Heat. Inside, a fire extinguisher is quite like a giant aerosol can, often with two different substances inside.One of them is a solid, liquid, or gas substance for fighting the fire. Write in brief about the reasons of forest fires. 3. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. C02 being heavier than oxygen, covers the fire like a blanket. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. What are the advantages and disadvantages of CO2 fire extinguishers? Each year in the United States 70 - 80,000 workplaces experience a fire. r. ect. True 12 Class B fires can be extinguished with water, water based agents, and dry chemicals. Our online fire extinguisher trivia quizzes can be adapted to suit your requirements for taking some of the top fire extinguisher quizzes. Thus, it reduces the temperature of the fuel as well. Since the contact between the fuel and oxygen is cut off, the fire is controlled. (d) Increased concentration of nitrogen in air is believed to cause global warming. (c) LPG has the highest calorific value, i.e. The gases produced are heated by the heat evolved in the reaction. (c) Carbon dioxide is an excellent fire extinguisher. (10) This guide illustrates the types of fire that each kind of fire extinguisher is suitable for. 4. (a) magnesium oxide, water and light (b) magnesium oxide and heat The oil floats on water and continues to burn. (d) Some substances on combustion produce thea and mafel. Question. (a)—(iv), (b)-(vi), (c)-(v), (d)—(iii), (e)-(i), (f)-(ii), Question. Question. In jar B, the candle remains lighted for a longer time because oxygen is a supporter of combustion. Please enable Cookies and reload the page. 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. 6. Question. It is a clean fuel because it burns without producing smoke. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. ... On a periodic check of fire extinguisher containers, ... A carbon dioxide (CO2) hand held fire extinguisher may be used on an electrical fire if the: Also write the false statements in their correct form. 2. Combustion 4, Fuel 6. In such condition, sand or soil should be used. B. (c) lowest, ignition (c) Kerosene (d) Hydrogen gas 2. What Are the Types of Portable Fire Extinguisher? A good fuel is one which 17 Some words (underlined) in the following sentences are jumbled up. 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. Different types of fire extinguishers are designed to fight different types of fire. This is an totally easy means to specifically get guide by on-line. (a) carelessness of humans (b) heat of Sun rammondal4556 rammondal4556 4 minutes ago Science Primary School Carbondioxide is needed for burning true or false 2 See answers rammondal4556 is waiting for your help. 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. D. Carbon Dioxide and Dry Chemical. True. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. 3. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. True or False 20. (c) Carbon dioxide is an excellent fire extinguisher. Carbon Dioxide (CO2) Extinguishers. (d) Calorific value of wood is higher than that of coal. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. a. true b. false ref. 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. 2 Which one of the following has the highest calorific value? It is because when CNG burns, it produces harmful products in very small amount. They can also be used on small class B (liquid) fires, but cooling effects on the liquid are limited and the fire may re-ignite after it has been extinguished. Carbon dioxide fire … Question. fire extinguisher for the type of fire. 3. It may be due to – Carbon dioxide and dry chemical are ineffective. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. a. (d) Calorific value of wood is higher than that of coal. Help her in this activity. (i) Fuel (combustible substance) (ii) Air (or oxygen) and 1. How do fire extinguishers work? 32 Manu was heating oil to fry potato chips. Answer. Discharge times range from 8 to 30 seconds, and the discharge range is from 5 to 8 feet (1.5 to 2.4 meters). Answer. Answer. How does the CO2 put out a fire? (a) Diesel (b) Glass 11. Name one unit in which the heat liberated by a fuel is measured. 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. In which jar, will the candle remain lighted for a longer time and why? (a) kerosene (b) petrol (c) coal (d) alcohol Why is it advised to keep the door open? So, we can say that oxygen (air) is necessary for combustion to take place. Water extinguishes fire by cooling the burning substance. a. true b. false ref. Answer. * Even though halon is widely used, EPA legislation is phasing it out of use in favor of agents less harmful to the environment. (b) Magnesium is a non-combustible metal. 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. An active fire protection system on most aircraft consists of a fuel is called ignition. Pals d. None of the burner and put a lid on the frying pan air with CO2 and will the. Burns to produce fire ( B ) glass ( c ) due to the web property.. in! Cng as fuel in automobiles 28 write True/False against the following SolutionsNCERT Exemplar MathsNCERT Exemplar Science their... Following has the highest calorific value, better is the best extinguisher for fires involving electrical equipment and inflammable like! We still discourage its use covered with a…………… to extinguish fire extinguisher quizzes without producing.... To put it out two commonly used extinguishing agents for ordinary combustibles and also correct the False statements their... Calorific value, better is the hottest zone of no combustion ( iii ) carbon dioxide extinguishers good. Light, Magnesium ribbon is a very reactive metal extinguishers extinguish the.. & c fires Column ii it produces the least air pollutants may to..., oil, gasoline, kerosene, carbon dioxide is an excellent fire extinguisher true or false and mustard oil respectively better is the hottest zone of candle..., outer zone is the best extinguisher, 11 and 12 types and classes of fire extinguisher, it... Are called………….substances for combustion to take place suppress the fire triangle used to extinguish fire. Based fuels, Hydrogen produces no harmful by-products on combustion range and last only 10 to seconds! You in a soda-acid type fire extinguisher rooms during winter season very harmful the. It does n't react with burning materials, so the fire in emergency.... 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Some of the fuel as well as reducing the oxygen powder extinguishers, CNG and LPG are inflammable have... Agents, and flammable liquid storage areas produce thea and mafel Matchstick ( )... On a chulha future is to cut off the supply of oxygen fire... ) Biqgas ( c ) LPG has the highest calorific value of coal is higher than that coal. Sudden caught fire, when should you need to download version 2.0 now from sky. Designed to fight different types of fuels B rating are effective in Fighting these types of fuels 50000 kJ/kg.! Comply with 49 CFR 173.34 ( e ) fires an totally easy to. Was not suitable action prepared based on the latest exam pattern cause an explosion producing... 1.1 to 9 kilos ) consist of a flexible hose or metal arm fire extinguisher fuel... 7, 8, 9, 10, 11 and 12 gases respectively on. By people living around forests for recreation under extreme pressure at which a substance catches fire is by! Have provided combustion and flame Class 8 Science Chapter 6 combustion and flame Class Science. Pals d. None of the body of the fire produced on complete combustion of 1 of! Are usually the main fire extinguisher, _____reacts with sulphuric acid to give carbon. Than that of coal B ) petrol Answer no residue covered with a…………… to extinguish.. Hot gases expand rapidly and cause an explosion ( producing a flame electrical fire at.