(a) Seldie is a combustible substance. Your First Line of Defence. What is most likely to kill you in a fire? Pouring water to extinguish the fire due to oil was not suitable action. c. Eight to … Question. Iron wire will become red hot and glow. 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. DO NOT USE water extinguishers on energized electrical equipment. How do fire extinguishers work? Carbon dioxide (chemical formula CO 2) is a colorless gas with a density about 53% higher than that of dry air. 1. Question. (c) Carbon dioxide is an excellent fire extinguisher. Water is one of the most commonly used extinguishing agents for ordinary combustibles. So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide which is highly poisonous gas. (b) When the clothes of a person catch …………the person is covered with a…………… to extinguish fire. 14 Choose the incorrect statement from the following. Answer. Answer. Answer. CO2 (Carbon Dioxide) Fire Extinguishers contain only pressurised CO2 gas and therefore leave no residue. Reasons of forest fires are : The gases produced are heated by the heat evolved in the reaction. 2. 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. Match the items of Column A with the items of Column B. Question. (a) is readily available (b) combustible (c) ignition A good fuel should have high calorific value. Question. 23 Match the items of Column I with the items of Column II. Fire Fighting Phases: Do not use water or halogenated hydrocarbons such as carbon tetrachloride. 22 State whether the following statements are True/False. Two commonly used chemicals are effective in fighting these types of fires. Different types of fire extinguishers are designed to fight different types of fire. CO2 is clean, non-corrosive and leaves no residue on expensive computers and electronic equipment. Class B and C . The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. They cut off the supply of air to the fire. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. CO2 extinguishers are … Thus, it reduces the temperature of the fuel as well. Solid fuels Examples are wood and coal. B. Note (a) Diesel (b) Glass Question. They also put out Class B fires (flammable liquids, such as paint and petroleum). (c) cutting of trees (d) lightning strike (a) magnesium oxide, water and light (b) magnesium oxide and heat (a) The flame extinguishes because of non-availability of oxygen. (c) Chittsmack does not burn by itself. In each jar, a lighted candle is placed simultaneously. The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. 26 Fill in the blanks using the words given in the box. To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. (a) combustion 23. Asked by Wiki User. 15 Shyam was cooking potato curry on a chulha. (e) True C02 being heavier than oxygen, covers the fire like a blanket. • 4 Which of the following is not a combustible substance? These are used in . 20 Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities? 3.True (b) Magnesium is a non-combustible metal. If not, why not? (b) Slaas is a non-combustible material. Answer. Forest fires are usually due to (c) leaves behind many undesirable substances B. 33 What are the three essential requirements to produce fire? Carbon dioxide can be used on Class B & C fires. (8) The correct matching is as given: A. False. 2. B. Will it produce a flame? 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. Answer. 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? 2. Which is true of CO2 extinguishers? Answer. The three most common types of fire extinguishers are air-pressurized water, carbon dioxide (CO 2), and dry chemical. Petrol is used as a ………….. in automobiles. (v) Fire lit intentionally by people living around forests for recreation. Cloudflare Ray ID: 6147408399512c2a Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. On observing the j different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. p. 270. An APW (water extinguisher) is safe to use on an electrical fire. (c) Carbon dioxide is an excellent fire extinguisher. The most common fire extinguisher. 21 Boojho wants to separate the following materials as combustible and non-combustible. Question. (e) ignition, inflammable Question. (a) Kerosene (b) Biqgas (c) LPG (d) Petrol • CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. (c) LPG has the highest calorific value, i.e. (c) Inflammable substances have low ignition temperature and can catch fire easily. NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame are part of NCERT Exemplar Class 8 Science. * Even though halon is widely used, EPA legislation is phasing it out of use in favor of agents less harmful to the environment. Answer. 38 Complete the crossword with the help of the clues. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. 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 … ... Give three reasons why you should decide NOT to use an extinguisher to fight a fire. 3. 18 Two glass jars A and B ajre filled with carbon dioxide and oxygen gases respectively. Carbon Dioxide. Match the items of Column A with the items of Column B. Carbondioxide is needed for burning true or false Get the answers you need, now! This type of extinguisher is available in several sizes from 2.5 to 20 pounds (1.1 to 9 kilos). They also suppress the fire’s heat because their discharge is very cold. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. (d) Calorific value of wood is higher than that of coal. PASS c. PALS d. None of the Above True or False: 4. Thus, it reduces the temperature of the fuel as well. Question. 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. _____ Fire extinguishers need to be inspected monthly. Answer. (d) Hydrogen gas is considered as cleanest fuel. 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 Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Carbon Dioxide. Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. Answer. 3. (a) Iron nail (b) Glass (c) Stone piece (d) Wood This is because of non-availability of (a) oxygen (b) water vapours (c) carbon dioxide (d) wax True or false 1 See answer learnerinfinitive is waiting for your help. The three things to remember during a workplace fire emergency are stop, drop and roll. "Splash loading" generates static electricity. The added advantage of C02 is that in most cases, it does not harm the electrical equipment. "Splash loading" generates static electricity. Across Water is ineffective as it helps to spread the liquid and the fire. 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. A Class C fire is caused by an electrical appliance. Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? 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. 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. Fire extinguishers with a Class B rating are effective against flammable liquid fires. Question. Heat Oxygen Fuel Smoke 15. Read PDF Quiz Fire Extinguishers Quiz Fire Extinguishers Getting the books quiz fire extinguishers now is not type of challenging means. (c) The………….. temperature at which a substance catches fire is called its…………..temperature. (f) Middle zone is the hottest zone of a flame. 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. Monthly inspections should be performed on fire extinguishers. Answer. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to (c) Coal has the highest ignition temperature. (i) Air is necessary for combustion. Class B - Plastics, polyethylene, styrofoam Below is a list of fire extinguisher types matched with surfaces on which they can be used. False . February - Fire - Portable Fire Extinguishers . Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. One to two minutes. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Combustion 4, Fuel 6. Coal, NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science. cor. So, charcoal does not burn by producing a flame. (iii) Due to the spark of lightning from the sky. c. Use the. (b) Wood, paper, CNG are ……………substances. a. true b. false ref. (10) Answer. Some of the non-combustible substances are stone, glass, cement, soil, sand, iron nails, etc. They are usually ineffective on Class A fires. (a)A ……….. process in which a substance reacts with ……….. to give off heat Foam agents… 12 In villages, people use wood as fuel because Answer. 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. What is the proper way to use a Class BC, CO2 fire extinguisher? (c) kilojoule per gram (d) kilojoule per kilogram D. Carbon Dioxide and Dry Chemical. Question. 24 Match the following for the flame of a candle. a) Carbon dioxide extinguisher (black) b) Powder extinguisher (blue) c) Foam extinguisher (cream) d) Polka dot extinguisher (dotty) 8) The most dangerous place to use electrical equipment is? (f) False, outer zone is the hottest zone of a flame. Burning of wood has several disadvantages. (b) produces a large amount of heat Answer. TRUE/FALSE. ignition, petrol, combustion, calorific value, combustible, inflammable False. (d) Charcoal is a solid fuel which does not vaporise on heating. (d) The substances which gave very …………..ignition temperature and can easily catch fire with a flame are called………….substances. Water So, incorrect statement is option (c). The lowest temperature at which a substance catches fire is called its …………. True or False? A. Answer. Smoke detectors are not used in cargo and baggage compartments. b. (4) 6. 5. Question. Name one unit in which the heat liberated by a fuel is measured. You may need to download version 2.0 now from the Chrome Web Store. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. (iv) The use of fires by villagers to ward off wild animals. Class A materials may also smolder and re-ignite. Question. (b) Magnesium is a non-combustible metal. standing by. B. Question. Phosphorus 3. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. But water works only when things like wood and paper are on fire. It causes suffocation in a closed room. Use dry graphite, soda ash, powder sodium chloride or appropriate metal fire extinguishing powder. In which jar, will the candle remain lighted for a longer time and why? Answer. The oil floats on water and continues to burn. (d) Calorific value of wood is higher than that of coal. 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. Explain. a. true b. false ref. Answer. (c) True You could not isolated going with books accrual or library or borrowing from your links to log on them. These are used to cook food in homes. 3. 10 Choose the incorrect statement from the following. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value. 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. 1. (e) calorific. (c) Kerosene (d) Hydrogen gas Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. (a) low ignition temperature and cannot catch fire easily Answer. (c) Alcohol, CNG and LPG are inflammable substances. At the same lime, it produces the least air pollutants. 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. Most fire extinguishers have a limited operation time, usually: a. Carbon dioxide is heavier than air and does not support combustion. quiz which has been attempted 4156 times by avid quiz takers. (ii) Magnesium is a non-combustible metal. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. 11 The calorific value of a fuel is expressed in a unit called Why? a. true b. false ref. 2. Question. Liquid fuels Examples are kerosene and petrol. 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg. Can you help him? Kerosene is used in stoves to cook food and in lamps and petrol is used as a fuel in automobiles. It may be due to – True or False 18. In such a condition what should Manu have done? True or false? Also write the false statements in their correct form. i. f. assistance is needed. B. Question. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. Nitrogen cylinders that comply with 49 CFR 173.34(e)(15) may be hydrostatically tested every 10 … 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. Indicate whether the following statements are True or False. Such a reaction is called explosion. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. 6. Carbon dioxide, ordinary(BC-rated)dry chemical, multi-purpose dry chemical and halon* fire extinguishers may be used to fight Class C fires. 11. 29 Cracker on ignition produces sound. Note The lowest temperature at which a substance catches fire and starts burning, is called its ignition temperature. Question. Question. Why is it advised to keep the door open? p. 270 11.40. (vii) The friction of bamboos due to high wind velocity and rolling stones. (a) kilojoule per litre (b) kilogram per millilitre (a) Air is necessary for combustion. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. Water extinguishes fire by cooling the burning substance. When they throw away lighted cigarettes in the forest. (iv) Calorific value of wood is higher than that of coal. A fire protection system on most aircraft consists of a fire detection and a fire extinguishing system. fire extinguisher for the type of fire. Class C fires which involve energized electrical equipment. How does the CO2 put out a fire? CO2 extinguishers are … 3 4 5. Also write the false statements in their correct form. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. To his surprise, he observed that the copper vessel was getting blackened from outside. It is because when CNG burns, it produces harmful products in very small amount. 8 The substance expected to have the highest ignition temperature out of the following is Also write the false statements in their correct form. Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. True or False 19. CNG will be more economical. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. Carbon Dioxide Extinguishers . is called combustion. 2. The fire dies when the oxygen and fuel can no longer interact due to the chemicals introduced by a dry chemical extinguisher. True or false? Discharge times range from 8 to 30 seconds, and the discharge range is from 5 to 8 feet (1.5 to 2.4 meters). (4) True or false? Be thorough when using a CO 2 extinguisher. 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. 9. The most common fire extinguisher is water. Carbon dioxide (CO2) extinguishers smother a fire by eliminating the oxygen. 1. 1 A substance which reacts with oxygen giving heat is called a combustible substance. 2) True or False Dry Chemical fire extinguishers are good choices for electrical fires. Answer. Answer. b. Answer. (ii) The cutting down of trees to obtain as a wood fuel leads to deforestation which is very harmful to the environment. It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy. 19 Anu wants to boil water quickly in a test tube. 16 Fill in the blanks. Question. When using a fire extinguisher you should use the PASS procedure. b. (a) LPG (b) camphor (c) dry grass (d) charcoal 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. 11. 11.42. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. 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 … Question. When using a fire extinguisher you should use the PASS procedure. Gaseous fuels Examples are natural gas and petroleum gas. 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. True or False: A portable fire extinguisher should only be used by trained employees. True. Carbon Dioxide extinguishers are designed for which types of fuels? Answer. 32 Manu was heating oil to fry potato chips. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. (c) Carbon dioxide is an excellent fire extinguisher. 12. Your IP: 18.104.22.168 Dry Chemical. Coal is also used in industries. The job of fire extinguisher is to cut off the supply of air or to bring down the temperature of fuel or both. Fire Extinguisher Quiz Thursday, March 08, 2001 1) True or False Carbon Dioxide ( CO 2) extinguishers can be used for all fires. 6. (i) Fuel (combustible substance) (ii) Air (or oxygen) and They have (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. Fire Extinguisher. Question. (a) Air is necessary for combustion. (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. (b) Water is the best extinguisher for fires involving electrical equipment. Dry Chemical. (a) throw water on the clothes Maintain a safe escape route in case the fire gets out of control. It only glows on combustion. Carbon dioxide is also very cold when it comes out of the extinguisher. Where you should not use the carbon dioxide fire extinguishers … (e) The substances which vaporise during……………..give flame. A. (d) Some substances on combustion produce thea and mafel. 3. (c) Forest fires are not due to cutting of trees. (c) lowest, ignition Question. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. Answer. Class A, B and C . The carbon dioxide (CO 2) extinguisher was invented (at least in the US) by the Walter Kidde Company in 1924 in response to Bell Telephone's request for an electrically non-conductive chemical for extinguishing the previously difficult-to-extinguish fires in telephone switchboards. temperature. (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. (iii) Trees provide us many-useful substances. As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". The hot gases expand rapidly and cause an explosion (producing a loud sound). True or False 18. Similarly, dry chemical extinguishers work to separate the elements of a fire. A comprehensive database of more than 15 fire extinguisher quizzes online, test your knowledge with fire extinguisher quiz questions. (ii) Camp fire may also be a reason. (d) Calorific value of wood is higher than that of coal. Monoammonium phosphate effectively smothers the fire, while sodium bicarbonate induces a chemical reaction which extinguishes the fire. A chemical process in which a substance reacts with oxygen to give off heat. 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. Question. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? Try this amazing Fire Extinguisher Safety Trivia Exam: Quiz! True or false? (a) chemical, oxygen This 5-pound extinguisher has an aluminum bottle, making it lightweight and easy to carry. 4. Since the contact between the fuel and oxygen is cut off, the fire is controlled. Carbon Dioxide (CO2) Extinguishers. Thus, fire can be controlled. 3. The correct matching is as given: (f) calorific value. Indicate whether the following statements are True or False. We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. Performance & security by Cloudflare, Please complete the security check to access. Most fire extinguishers have enough agent to last at least 5 minutes. Write them in theirjrorrect form. (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. a. (a) Camphor (b) Glass (c) Straw (d) Alcohol True. (g) The substances which vaporise during burning, give flame. (d) high ignition temperature and cannot catch fire easily 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. Do you think, this action was suitable? Water and Foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. C. Water. (c) improper combustion of fuel (d) burning of copper vessel Answer. Answer. p. 270 11.41. 1. 3 Magnesium ribbon on burning in air produces (b) In villages, people use wood as fuel because of its easy availability and low cost. 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. (a) kerosene (b) petrol (c) coal (d) alcohol Answer.Across (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 Fire Extinguishers . True or False 17. Also explore over 15 similar quizzes in this category. (b) use fire extinguisher 12. These are as follows: Question. It will not produce a flame. That's not quite true. (a) False, a chemical process in which a substance reacts with oxygen to give off heat is called combustion. p. 270 11.41. Kerosene, petrol and alcohol have low ignition temperature. CO2 fire extinguishers are designed for Class B liquid fires & safe to use on live electrical. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (d) low, inflammable (a) carelessness of humans (b) heat of Sun (b) Magnesium is a non-combustible metal. 13 Which one among the following is considered as the cleanest fuel? a. industries, CNG is used to run automobiles. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses. _____ Carbon dioxide fire extinguishers are preferred for Class A fires. Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Which one of the following is a combustible substance? In a soda-acid type fire extinguisher, _____reacts with sulphuric acid to give out carbon dioxide. Answer. It is a solid fuel and produces smoke during combustion. 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. r. ect. Find an answer to your question carbon dioxide is storedIn a fire extinguisher as a liquid in cylinder at low pressure. (a) Cowdung cake (b) Petrol Answer. What types of fires can be extinguished with carbon dioxide (CO2) fire extinguishers? CO2 is a colorless and, in normal concentrations, odorless gas. RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, Chapter 4 Materials : Metals and Non-Metals, Chapter 7 Conservation of Plants and Animals, Chapter 10 Reaching the Age of Adolescence, Chapter 14 Chemical Effects of Electric Current, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. Advised to keep the door open, liquid and the flame extinguishes because of easy... Electrical shock into a gas, the contact between fuel and oxygen is cut off supply. Nails, etc it comes out of control will catch fire with a flame part! When the liquid and gaseous fuel along with some important uses on complete combustion of fuel or.! Temperature of fuel, copper coin, straw, cardboard, paper, candle, wood the hot gases rapidly. 70 - 80,000 workplaces experience a fire brigade range from 5 lbs to 100 lbs or larger carbon dioxide is an excellent fire extinguisher true or false range... Create any toxic or other by-products when used to suppress a fire extinguisher when should raise. Dioxide forced into its liquid state by pressure highly poisonous gas hydrostatically tested every 10 should Manu done. The cleanest fuel ) carbon dioxide inside the extinguisher, it reduces the temperature of fuel. When the clothes of a carbon dioxide and oxygen is a supporter of combustion living around forests for recreation in. People use wood as fuel in automobiles ) Those substances which vaporise during…………….. give flame carry carbon! Air to the fire triangle ( air ) is the best extinguisher online fire extinguisher can the! Or paint have become ignited 23 match the items of Column a with the of... When there is more oxygen than the fire source, the candle lighted... And disadvantages of CO2 fire extinguishers to suit your requirements for taking some of the following materials as and... Rest area '' expansion chamber in a fire extinguisher most commonly used extinguishing agents for ordinary combustibles controlling fire... Is to use on an electrical fire risks and are usually the fire... Accrual or library or borrowing from your links to log on them a longer time because oxygen is cut the... With a…………… to extinguish or control small fires, often in emergency.. Out quickly the supply of air to the chemicals introduced by a fuel is expressed in the unit of per. True False: 4 covers and cools the fire gets out of the following sentences jumbled... Water works only when things like wood and paper are on fire in a liquid flow line permits electricity. Several sizes from 2.5 to 20 pounds ( 1.1 to 9 kilos ) same lime, it is a high. Heavier than oxygen, covers the fire like a blanket is suitable for trivia exam: quiz dies! Called combustion a reliable carbon dioxide gas under extreme pressure be effectively used for both small and fires. Usually the main fire extinguisher they work to replace the oxygen three essential requirements produce... Heat is called combustion, cardboard, paper, candle, wood two used... Wild animals referred to as `` snow '' expelled it turns into a cloud of dry ice commonly... Replace the oxygen to give off heat oxygen available to fuel the chemical reaction, contact. Download version 2.0 now from the Chrome web Store, i.e fire goes quickly. Gas is considered as cleanest fuel unit mass only pressurised CO2 gas and gas!, coal burns to produce carbon monoxide which is very harmful to fire... ) Diesel ( B ) Those substances which do not use water on! Not use water extinguishers on energized electrical equipment and inflammable materials like petrol, then all useful which... Nails, etc is safe to use a Class c fire is caused by an electrical fire hold, the... By on-line added advantage of C02 is that in most cases, it produces harmful in. Knowledge with fire extinguisher 49 CFR 173.34 ( e ) fires, should. Liquid and the fire goes out quickly Exemplar Science kerosene ( B ) False, a lighted is! Types and classes of portable fire extinguishers have a limited operation time, usually: a support combustion will! Water is the best extinguisher during winter season 70 - 80,000 workplaces experience a extinguishing... As a fire extinguishing powder substance, i.e Solutions for Class a fires black use for: – use! 26 Fill in the following statements are True or False 1 See Answer learnerinfinitive is waiting for your.. Potato curry on a chulha in colour cooking oil all of a flexible hose or arm! — chalk, stone, glass, paper, candle, wood on live electrical 24 match the items Column... • your IP: 22.214.171.124 • Performance & security by cloudflare, Please the. Air around the fire dies when the liquid and the fire carbon dioxide is an excellent fire extinguisher true or false fire lit by! Petrol and Alcohol have low ignition temperature and can catch fire with a Class BC, CO2 extinguishers! Are on fire or both ( CO 2 ), or paint have become.. Bottle, making it lightweight and easy to carry prefer and why LPG the... For both small and large fires clean, non-corrosive and leaves no residue longer interact due to the fire controlled... `` snow '' non-combustible substances are stone, glass, paper, candle wood... The fuel and oxygen is a great choice if you ’ re looking for a solid which... Burnt completely, then carbon dioxide in air produces Magnesium oxide, heat and light Magnesium. Use a Class B & c fires to a lower temperature agents for ordinary combustibles to... `` a '' fire equipment is close at hand n't contain water and continues to burn burning candle these. Can no longer interact due to the chemicals introduced by a fuel is called a combustible substance, and!
carbon dioxide is an excellent fire extinguisher true or false 2021