For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (d) cover the person with a polythene sheet It is a clean fuel because it burns without producing smoke. C. Water. 11.42. 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. Heat Oxygen Fuel Smoke 15. Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. DO NOT USE water extinguishers on energized electrical equipment. (c) Kerosene (d) Hydrogen gas Carbondioxide is needed for burning true or false Get the answers you need, now! cor. Also write the false statements in their correct form. (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 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. to 20 lbs. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. True or false? (5) Most fire extinguishers have a limited operation time, usually: a. Question. Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Carbon Dioxide (CO2) Extinguishers. Answer. Question. A chemical process in which a substance reacts with oxygen to give off heat. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. 25 If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Question. (iii) Carbon dioxide is an excellent fire extinguisher. (a) magnesium oxide, water and light (b) magnesium oxide and heat 1.Combustible — charcoal, straw, cardboard, paper, candle, wood. (a) LPG (b) camphor (c) dry grass (d) charcoal a. true b. false ref. CO2 extinguishers are … 3. Carbon Dioxide. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. CO2 is a colorless and, in normal concentrations, odorless gas. True or false? What is the proper way to use a Class BC, CO2 fire extinguisher? True. 5 The substance that does not burn with flame is True, air contains oxygen and oxygen is a supporter of combustion. 3 Magnesium ribbon on burning in air produces Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? In each jar, a lighted candle is placed simultaneously. 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. Question. c. Class A and C d. Class A and B . Question. 4.False, calorific value of coal is higher than that of wood. Answer. Carbon Dioxide. (iv) Calorific value of wood is higher than that of coal. a. true b. false ref. Smoke detectors are not used in cargo and baggage compartments. Water extinguishes fire by cooling the burning substance. 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. (d) high ignition temperature and cannot catch fire easily Question. (a) Iron nail (b) Glass (c) Stone piece (d) Wood Cloudflare Ray ID: 6147408399512c2a Answer. Class B and C . p. 270. Indicate whether the following statements are True or False. ... Give three reasons why you should decide NOT to use an extinguisher to fight a fire. Fire extinguishers can be effectively used for both small and large fires. Question. 4. (iii) Trees provide us many-useful substances. 1. (c) Carbon dioxide is an excellent fire extinguisher. 1. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2) is the best extinguisher. (a) carelessness of humans (b) heat of Sun (b) Those substances which do not burn are called non-combustible substance. 3.True (d) Hydrogen gas is considered as cleanest fuel. False, magnesium is a combustible metal. Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. TRUE/FALSE. 6. These are as follows: (a) throw water on the clothes Answer. This is because of non-availability of (a) oxygen (b) water vapours (c) carbon dioxide (d) wax p. 270 11.41. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. Question. Use dry graphite, soda ash, powder sodium chloride or appropriate metal fire extinguishing powder. Carbon dioxide is also very cold when it comes out of the extinguisher. p. 270 11.39. 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. Most fire extinguishers have enough agent to last at least 5 minutes. 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. Water is ineffective as it helps to spread the liquid and the fire. c. Use the. (g) True. 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. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. (4) Carbon Dioxide extinguishers are designed for which types of fuels? (d) petrol (8) 1. a. true b. false ref. (a) Seldie is a combustible substance. 35 The calorific values of petrol and CNG are 45000 kJ/kg and 50000 kJ/kg respectively. Name one unit in which the heat liberated by a fuel is measured. False. The calorific value of a fuel is expressed in kJ/kg. p. 270 11.40. Answer. (4) CO2 cylinders are red and range in size from 5 lbs to 100 lbs or larger. ), or otherwise requires the expertise of a fire brigade. Your IP: 148.251.76.241 (c) The lowest temperature at which a substance catches fire is called its …………… temperature. (f) False, outer zone is the hottest zone of a flame. Asked by Wiki User. As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". Three essential requirements to produce fire are as follows: They also suppress the fire’s heat because their discharge is very cold. True or False 19. What are the advantages and disadvantages of CO2 fire extinguishers? Question. How does the CO2 put out a fire? So, incorrect statement is option (c). Our online fire extinguisher trivia quizzes can be adapted to suit your requirements for taking some of the top fire extinguisher quizzes. 3. 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