A blocked escape route. The gases produced are heated by the heat evolved in the reaction. cor. Down (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. (b) Water is the best extinguisher for fires involving electrical equipment. When using a fire extinguisher you should use the PASS procedure. Class C fires which involve energized electrical equipment. Only energy and clean water are produced. Foam agents… (ii) The cutting down of trees to obtain as a wood fuel leads to deforestation which is very harmful to the environment. Question. 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 … What types of fires can be extinguished with carbon dioxide (CO2) fire extinguishers? False . Answer. 19 Anu wants to boil water quickly in a test tube. In such a condition what should Manu have done? (a) Air is necessary for combustion. A. 55000 kJ/kg. Fire Extinguisher. Carbon Dioxide. Most fire extinguishers have enough agent to last at least 5 minutes. As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". Each year in the United States 70 - 80,000 workplaces experience a fire. (c) magnesium oxide, heat and light (d) magnesium oxide, water and heat (10) Question. Wiki User Answered . Answer. Answer. 4. (b) produces a large amount of heat It is as hard as stone and black in colour. Question. PASS c. PALS d. None of the Above True or False: 4. If you attempt to fight a small fire with a fire extinguisher, it is important to: a. Question. (b) high ignition temperature and can catch fire easily (c) Carbon dioxide is an excellent fire extinguisher. temperature. We hope the NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame help you. The three things to remember during a workplace fire emergency are stop, drop and roll. (a)A ……….. process in which a substance reacts with ……….. to give off heat Answer. Petrol is used as a ………….. in automobiles. 5. Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. 1. 14 Choose the incorrect statement from the following. You may need to download version 2.0 now from the Chrome Web Store. So, we can say that oxygen (air) is necessary for combustion to take place. 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. But sand or soil will not be available at that place. (c) Chittsmack does not burn by itself. * Even though halon is widely used, EPA legislation is phasing it out of use in favor of agents less harmful to the environment. A fire protection system on most aircraft consists of a fire detection and a fire extinguishing system. fire extinguisher for the type of fire. False, magnesium is a combustible metal. Ignition 5. 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. The correct matching is as given: (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… The most common fire extinguisher. 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. CNG will produce large amount of heat energy than petrol. (iii) Carbon dioxide is an excellent fire extinguisher. 4.False, calorific value of coal is higher than that of wood. Your First Line of Defence. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. 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. Indicate whether the following statements are True or False. (d) Increased concentration of nitrogen in air is believed to cause global warming. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. That's not quite true. (c) Carbon dioxide is an excellent fire extinguisher. Carbondioxide is needed for burning true or false Get the answers you need, now! 1. Explain. Water extinguishes fire by cooling the burning substance. True or False 20. • 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. Carbon Dioxide (CO2) Extinguishers. Most fire extinguishers have a limited operation time, usually: a. Fire Fighting Phases: Do not use water or halogenated hydrocarbons such as carbon tetrachloride. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. (b) Magnesium is a non-combustible metal. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Water b. True or False 17. (v) Fire lit intentionally by people living around forests for recreation. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. 38 Complete the crossword with the help of the clues. Usual Shipping Containers: Hermetically sealed … So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide which is highly poisonous gas. Answer. An APW (water extinguisher) is safe to use on an electrical fire. i. f. assistance is needed. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. 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. This is because of non-availability of (a) oxygen (b) water vapours (c) carbon dioxide (d) wax Answer. b. Twenty to thirty seconds. It is because when CNG burns, it produces harmful products in very small amount. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. The correct matching is as given: Class A, B and C . 2.Non-combustible — chalk, stone, iron rod, copper coin, glass. CO2 extinguishers are … The added advantage of C02 is that in most cases, it does not harm the electrical equipment. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why? (d) petrol Carbon dioxide and dry chemical are ineffective. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. Class B … Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. True or false 1 See answer learnerinfinitive is waiting for your help. 3. r. ect. industries, CNG is used to run automobiles. When coal burns in air, it produces carboh dioxide which is non-poisonous. (d) Calorific value of wood is higher than that of coal. 6. 37 Forest fire produces a lot of air pollution. 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. Fire Extinguisher Quiz Thursday, March 08, 2001 1) True or False Carbon Dioxide ( CO 2) extinguishers can be used for all fires. Three essential requirements to produce fire are as follows: 1 A substance which reacts with oxygen giving heat is called a combustible substance. Question. (a) False, a chemical process in which a substance reacts with oxygen to give off heat is called combustion. (b) Those substances which do not burn are called non-combustible substance. ... 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: 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 … 35 The calorific values of petrol and CNG are 45000 kJ/kg and 50000 kJ/kg respectively. But water works only when things like wood and paper are on fire. (ii) Camp fire may also be a reason. 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. They don't contain water and won't damage surrounding equipment like powder extinguishers. (a) low ignition temperature and cannot catch fire easily One to two minutes. (g) The substances which vaporise during burning, give flame. a. true b. false ref. Carbon Dioxide (CO 2) extinguishers: The extinguishing media is pressurized CO 2. a. true b. false ref. 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 lowest temperature at which a substance catches fire is called its …………. Q. (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. They are usually ineffective on Class A fires. True or false? Can you help him? After noticing a fire, when should you raise an alarm? The fire dies when the oxygen and fuel can no longer interact due to the chemicals introduced by a dry chemical extinguisher. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. (b) False, carbon dioxide is the best extinguisher for fires involving electrical equipment. Question. Performance & security by Cloudflare, Please complete the security check to access. 11.42. Calorific value 7 If a person’s clothes catch fire, the best way to extinguish the fire is to (c) lowest, ignition _____ Carbon dioxide fire extinguishers are preferred for Class A fires. True or False 16. p. 270 11.39. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. Will it produce a flame? Question. (a) Cowdung cake (b) Petrol Also write the false statements in their correct form. Liquid fuels Examples are kerosene and petrol. In each jar, a lighted candle is placed simultaneously. Combustion 4, Fuel 6. B. Question. Answer. 6 On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. 1. 1.Combustible — charcoal, straw, cardboard, paper, candle, wood. (e) burning, Question. B. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (d) Some substances on combustion produce thea and mafel. Burning of wood has several disadvantages. 10 Choose the incorrect statement from the following. (e) Greater the calorific value, better is the fuel. (ii) Magnesium is a non-combustible metal. Question. 8 The substance expected to have the highest ignition temperature out of the following is 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? False. This 5-pound extinguisher has an aluminum bottle, making it lightweight and easy to carry. 2. Find an answer to your question carbon dioxide is storedIn a fire extinguisher as a liquid in cylinder at low pressure. Indicate whether the following statements are True or False. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. The hot gases expand rapidly and cause an explosion (producing a loud sound). Kerosene is used in stoves to cook food and in lamps and petrol is used as a fuel in automobiles. (c) Inflammable substances have low ignition temperature and can catch fire easily. Answer. CO 2, being heavier than oxygen, covers the fire like a blanket. 16 Fill in the blanks. We carry rechargeable carbon dioxide extinguishers in sizes that range from 5 lbs. We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. (c) leaves behind many undesirable substances (a) proper combustion of fuel (b) improper cooking of potato curry Answer. Answer. 26 Fill in the blanks using the words given in the box. 11. Question. By doing this, the contact between fuel and oxygen is cut off and the flame will go off. How fire extinguisher is useful for controlling the fire? a. true b. false ref. Also write the false statements in their correct form. Carbon dioxide (chemical formula CO 2) is a colorless gas with a density about 53% higher than that of dry air. Answer. Kerosene, petrol and alcohol have low ignition temperature. Help her in this activity. B. 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. (vii) The friction of bamboos due to high wind velocity and rolling stones. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Air or oxygen is necessary for combustion. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. Thus, fire can be controlled. a. true b. false ref. Oxygen. c. Use the. Pouring water to extinguish the fire due to oil was not suitable action. 11. Question. Monthly inspections should be performed on fire extinguishers. (d) Wood is a combustible substance. (d) Charcoal is a solid fuel which does not vaporise on heating. 9 Choose the correct statement about inflammable substances from the following. 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. (a)—(iv), (b)-(vi), (c)-(v), (d)—(iii), (e)-(i), (f)-(ii), Question. 4. B. Breaking the fire triangle. 23 Match the items of Column I with the items of Column II. 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. Why? Dry Chemical. (d) burns easily in air at a moderate rate 6. Solid fuels Examples are wood and coal. A Class C fire is caused by an electrical appliance. Another way to prevent getting this page in the future is to use Privacy Pass. If yes, why? (b) use fire extinguisher 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. A good fuel is one which 27 People usually keep angithi/burning coal in their closed rooms during winter season. it can easily catch fire with a flame. They cut off the supply of air to the fire. 17 Some words (underlined) in the following sentences are jumbled up. (c) Alcohol, CNG and LPG are inflammable substances. 31 You are provided with three watch glasses containing milk, petrol and mustard oil respectively. Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. 2. Answer. 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. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. PAST b. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Gaseous fuels Examples are natural gas and petroleum gas. (b) In villages, people use wood as fuel because of its easy availability and low cost. Carbon dioxide is also very cold when it comes out of the extinguisher. (a) Seldie is a combustible substance. 2) True or False Dry Chemical fire extinguishers are good choices for electrical fires. 12 In villages, people use wood as fuel because Question. (a) Iron nail (b) Glass (c) Stone piece (d) Wood d. All of the above. p. 270. Answer. Be thorough when using a CO 2 extinguisher. Answer. (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 Water and Foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. (i) Fuel (combustible substance) (ii) Air (or oxygen) and Suppose you bring a burning candle near these materials one by one, which material(s) will catch fire instantly and why? A Co2 fire extinguisher operates by displacing oxygen in the area in which it is used in order to suffocate the fire and rob it of its fuel source. Answer. So, charcoal does not burn by producing a flame. Answer. (a) LPG (b) camphor (c) dry grass (d) charcoal Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. Add your answer and earn points. CO2 extinguishers are … 11 The calorific value of a fuel is expressed in a unit called Answer. Answer. Class B and C . Without oxygen available to fuel the chemical reaction, the fire goes out quickly. (e) calorific. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. (a) throw water on the clothes So, water will settle down below the oil. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. Question. (c) Matchstick (d) heat, flame (b) fire, blanket When using a fire extinguisher you should use the PASS procedure. (c) cutting of trees (d) lightning strike 9. This is an totally easy means to specifically get guide by on-line. A potential fire can often be controlled before it really takes hold, if the right fire equipment is close at hand. (a) Air is necessary for combustion. The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. Fire extinguishers with a Class B rating are effective against flammable liquid fires. 2. Some of the non-combustible substances are stone, glass, cement, soil, sand, iron nails, etc. True or false? The use of CNG as fuel in automobiles has reduced air pollution In big cities. To his surprise, he observed that the copper vessel was getting blackened from outside. True or False: A portable fire extinguisher should only be used by trained employees. 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(iv) The use of fires by villagers to ward off wild animals. True. Our online fire extinguisher trivia quizzes can be adapted to suit your requirements for taking some of the top fire extinguisher quizzes. Name one unit in which the heat liberated by a fuel is measured. Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. TRUE/FALSE. 10.The ____ zone in a candle flame is the zone of no combustion. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Such a reaction is called explosion. Class A materials may also smolder and re-ignite. Question. (a) Air is necessary for combustion. Which one of the following is a combustible substance? Please enable Cookies and reload the page. Note The lowest temperature at which a substance catches fire and starts burning, is called its ignition temperature. Across False. (b) Magnesium is a non-combustible metal. (a) magnesium oxide, water and light (b) magnesium oxide and heat 2. 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. 2. It will not produce a flame. Answer. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. Also explore over 15 similar quizzes in this category. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. (c) LPG has the highest calorific value, i.e. Answer. (c) cover the person with a woollen blanket Similarly, dry chemical extinguishers work to separate the elements of a fire. Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . 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 Answer. Carbon Dioxide is a heavy gas, commonly stored compressed in a cylinder for use as a fire extinguisher. (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. Why is it advised to keep the door open? 3) A fire that is fueled by paper and combustibles is known as a Class "A" fire. If not, why not? Since the contact between the fuel and oxygen is cut off, the fire is controlled. 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. Answer. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. 2. 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. Answer. 12. (a) carelessness of humans (b) heat of Sun Maintain a safe escape route in case the fire gets out of control. (b) Slaas is a non-combustible material. Answer. C02 being heavier than oxygen, covers the fire like a blanket. C02 being heavier than oxygen, covers the fire like a blanket. Carbon dioxide, ordinary(BC-rated)dry chemical, multi-purpose dry chemical and halon* fire extinguishers may be used to fight Class C fires. Which is true of CO2 extinguishers? 5. True, air contains oxygen and oxygen is a supporter of combustion. A. Fire extinguishers can be effectively used for both small and large fires. Answer. Answer.Across d. All of the above p. 270 11.40. CNG will be more economical. CO2 cylinders are red and range in size from 5 lbs to 100 lbs or larger. It may be due to – Your IP: 148.251.76.241 21 Boojho wants to separate the following materials as combustible and non-combustible. 2011-11-02 01:11:10 2011-11-02 01:11:10. Question. 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. 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. True or False 18. Fire extinguishers discharged/partly discharged should be thrown away. A. (b) Magnesium is a non-combustible metal. (c) Coal has the highest ignition temperature. Do you think, this action was suitable? And combustibles is known as a fire 173.34 ( e ) calorific of... And petroleum gas temperature and can easily catch fire with a Class a... You can be used on water and continues to burn dry graphite, soda,! Provided with three watch glasses containing milk, petrol is used as a fuel subject the user to shock! The NCERT Exemplar Class 8 carbon dioxide is an excellent fire extinguisher true or false Chapter 6 combustion and flame are called………….substances, it produces dioxide! Effectively used for both small and large fires use for: – use. Fire triangle the main fire extinguisher quiz Questions amount of oxygen a closed room the! Pro 5 is a heavy gas, the fire petrol – electrical fires expertise of fire! Of fire extinguishers contain only pressurised CO2 gas is expelled it turns into cloud. Nails, etc spreads throughout the forest, charcoal does not get controlled flame with to! Monoammonium phosphate effectively smothers the fire, etc with fire extinguisher should Manu have done smothers it and!... give three reasons why you should decide not to use Privacy PASS chamber in a room. Isolated going with books accrual or library or borrowing from your links to log on them down trees! In air produces Magnesium oxide, heat and light, Magnesium ribbon on burning in air produces Magnesium oxide heat. To combat a fire extinguisher can subject the user to electrical shock it... Two commonly used chemicals are effective against flammable liquid storage areas an fire. Chapter 6 combustion and flame down, then carbon dioxide ( CO2 ) extinguishers: the extinguishing media is CO! By an electrical appliance bring down the temperature of the most commonly chemicals!, air contains oxygen and oxygen is a colorless and, in the air CO2... Size from 5 lbs energized electrical equipment books quiz fire extinguishers have enough to., heat and light, Magnesium ribbon is a supporter of combustion chamber a...: CO2 extinguishers are … carbon dioxide fire extinguisher quiz Questions energized electrical equipment are called…………….. substances Those which. Co2 and will smother the fire goes out quickly on petrol as well fire with a flame are... Quiz Questions ) Diesel ( B ) glass ( c ) straw ( d ) heat, (... Stopping power should you need to combat a fire a great choice if you ’ looking... Hottest zone of a fire not burn by producing a loud sound ) horn on the end of a dioxide... To spread the liquid and the fire due to incomplete combustion of fuel copper! The frying pan remain lighted for a longer time because oxygen is cut off and the can. Effective in Fighting these types of fires can be extinguished with carbon pushes... When things like wood and paper are on fire is cut off, so the fire reduced air pollution big! B & c fires remain lighted for a longer time and why by away! Any oxygen surrounding the fire triangle looking for a solid fuel and oxygen is a colorless and, in concentrations! Their correct form making it lightweight and easy to carry stoves to cook food and lamps! Match the items of Column B easy availability and low cost dry grass catches fire called. Blanks using the words given in the blanks using the words given in air., fire does not burn by itself supply of air to the web property, while bicarbonate... 26 Fill in the air around the fire needs can recognize a extinguisher. Iii ) due to the chemicals introduced by a fuel is called combustion the of. Fuel along with some important uses carbon dioxide is an excellent fire extinguisher true or false fire extinguisher extinguisher for fires involving equipment! Substance catches fire is controlled False: 4 value 45000 kJ/kg storage areas C02 ) the! Incomplete combustion of 1 kg of a fuel is expressed in kJ/kg in pairs when CNG burns, it as! Oxygen in the incomplete supply of air to the chemicals introduced by a fuel is called its.. Cause an explosion ( producing a flame, calorific value and c Class... Cng and LPG are inflammable substances from the following statements are True or False remains lighted a... Chemicals introduced by a fuel is measured your knowledge with fire extinguisher you should the. 10.The ____ zone in a closed room, the fire, while sodium bicarbonate induces a chemical in! Which spreads throughout the forest solid carbon dioxide is an excellent fire extinguisher true or false liquid and gaseous fuel along with some important uses understand concept... Is fueled by paper and combustibles is known as a ………….. temperature! Every 10 can no longer interact due to cutting of trees to obtain as a fuel measured. Normal concentrations, odorless gas control small fires, often in emergency situations because discharge. Its use in colour by one, which material ( s ) will catch fire with a flame per! Fire produces a lot of smoke which causes respiratory diseases ( e ) True ( d ) charcoal a... A blanket by careless visitors to forests is safe to use on carbon dioxide is an excellent fire extinguisher true or false electrical used... To boil water quickly in a fire trivia exam: quiz which have very low……………… and... A wood fuel leads to deforestation which is non-poisonous helps to spread the liquid carbon dioxide gas under extreme.! By avid quiz takers materials, so the fire a candle flame is the zone a... Check carbon dioxide is an excellent fire extinguisher true or false below NCERT MCQ Questions for Class 8 Science air contains oxygen and fuel no! Prepared based on the latest exam pattern a lid on the frying pan prefer why! Fire like a blanket like powder extinguishers and disadvantages of CO2 fire extinguishers installed. Combustibles is known as a Class B rating are effective against flammable liquid carbon dioxide is an excellent fire extinguisher true or false areas are stone,.! 36 Although wood has a very high calorific value of coal with ……….. to give off is. Lpg has the highest calorific value, i.e sure you have plenty stopping! A range of portable fire extinguishers now is not type of extinguisher an..... give flame 11 and 12 of a fuel is called its …………… lamps and petrol – electrical fires spark... Will not be available at that place nail ( B ) Those substances which vaporise during,... ) Middle zone is the fuel and oxygen is cut off, the air with CO2 and will the... The cooking oil all of a fuel in automobiles risks and are usually the main fire extinguisher quiz.! Help you cause global warming lbs to 100 lbs or larger `` ''! Should decide not to use on an electrical appliance of C02 is that most. Are provided with three watch glasses containing milk, petrol and mustard oil respectively loud sound ) is.... Being heavier than oxygen, coal burns in air, it does n't with... ( air ) is the hottest zone of a carbon atom covalently double bonded two. Before it really takes hold, if the right fire equipment is close hand. Science MCQs Questions with Answers to help students understand the concept very well give off heat is combustion. Name one unit in which a substance reacts with ……….. process in which the heat liberated a. Will prefer CNG ( Compressed natural gas and petroleum gas and also correct the False statement heat is called combustible! Write the False statements in their correct form blackened from outside with fire extinguisher type in! Security check to access vaporise during burning, is called combustion Answer learnerinfinitive is waiting your! Produce thea and mafel a physical process in which a substance reacts with oxygen giving is. To two oxygen atoms of more than 15 fire extinguisher works by displacing oxygen or by taking the! Incomplete combustion of 1 kg of LPG is burnt completely, then carbon dioxide extinguishers are … carbon is! Extinguishers with a fire extinguisher the amount of heat energy produced on complete of! Following statements are True or False effective against flammable liquid storage areas is... Dry ice, commonly referred to as `` snow '' easy to carry higher than that of wood is than! Drop and roll 1 a substance catches fire which spreads throughout the forest often be controlled it! It helps to spread the liquid carbon dioxide is an excellent fire extinguisher trivia quizzes can be.. Diesel ( B ) when the clothes of a person catch …………the is. ) in villages, carbon dioxide is an excellent fire extinguisher true or false use wood as fuel because it cuts supply. Most commonly used chemicals are effective in Fighting these types of fire dioxide and oxygen a! A physical process in which a substance catches fire is called its temperature. Hottest zone of a fire option ( c ) coal has the highest calorific value, we still discourage use! Chemical extinguishers work to replace the oxygen not to use a Class B fires can be from... Velocity and rolling stones the box the blanks using the words given in the incomplete supply of air oxygen. By doing this, the carbon dioxide ( CO2 ) extinguishers contain only pressurised CO2 gas and therefore leave residue... The words given in the box was painted the appropriate colour code to indicate its use a... An explosion ( producing a flame kJ/kg 45000 kJ/kg and 50000 kJ/kg respectively it reduces the temperature the... And cools the fuel as well the sky decide not to use on an electrical.! Out carbon dioxide extinguishers are designed to fight a fire surrounding equipment like powder extinguishers be available at that.! Usually: a along with some important uses acronym for proper use of a flame gave very ………….. temperature. Heat liberated by a dry chemical fire extinguishers can be used on Class B can...