If yes, why? A. These are used in . (d) petrol Carbon Dioxide extinguishers are designed for which types of fuels? (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. b. A. (a) proper combustion of fuel (b) improper cooking of potato curry Have a back-up person. (c) kilojoule per gram (d) kilojoule per kilogram Most fire extinguishers have a limited operation time, usually: a. Which type of extinguisher has a hard horn on the end of a flexible hose or metal arm? It is a clean fuel because it burns without producing smoke. True False: Heat always flows from a higher temperature to a lower temperature. 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? Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. It is recommended that carbon dioxide fire extinguishers be installed in pairs. How does the CO2 put out a fire? Question. B. Three essential requirements to produce fire are as follows: True. (g) The substances which vaporise during burning, give flame. (c) Carbon dioxide is an excellent fire extinguisher. a. true b. false ref. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (b) produces a large amount of heat For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2) is the best extinguisher. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. Add your answer and earn points. (vi) Fires started accidentally by careless visitors to forests. 55000 kJ/kg. Which one of the following is a combustible substance? The lowest temperature at which a substance catches fire is called its …………. Question. a. true b. false ref. p. 270 11.40. (c) lowest, ignition Our online fire extinguisher trivia quizzes can be adapted to suit your requirements for taking some of the top fire extinguisher quizzes. Answer. (a) False, a chemical process in which a substance reacts with oxygen to give off heat is called combustion. 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? (f) calorific value. (a) Air is necessary for combustion. Answer. True 12 Class B fires can be extinguished with water, water based agents, and dry chemicals. (a)A ……….. process in which a substance reacts with ……….. to give off heat If you attempt to fight a small fire with a fire extinguisher, it is important to: a. A good fuel should have high calorific value. Classes of Fire Definitions: Green = Suitable; Red = Not Suitable; Orange = Limited (iii) Due to the spark of lightning from the sky. b. Twenty to thirty seconds. True b. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. 16 Fill in the blanks. 2. 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. 1. False. The amount of heat liberated when one kilogram of a fuel is completely burnt in sufficient supply of oxygen is called _____ of the fuel. (a) The flame extinguishes because of non-availability of oxygen. c. Eight to … Explain. (a) Diesel (b) Glass Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. 29 Cracker on ignition produces sound. (d) Charcoal is a solid fuel which does not vaporise on heating. 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. The calorific value of a fuel is expressed in kJ/kg. CO2 cylinders are red and range in size from 5 lbs to 100 lbs or larger. 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. Indicate whether the following statements are True or False. Since the contact between the fuel and oxygen is cut off, the fire is controlled. Write in brief about the reasons of forest fires. a. true b. false ref. What Are the Types of Portable Fire Extinguisher? Wiki User Answered . (a) A chemical process in which a substance reacts with oxygen to give off heat is called ……………… (b) When the clothes of a person catch …………the person is covered with a…………… to extinguish fire. True or false learnerinfinitive learnerinfinitive 29.04.2020 Science Secondary School Carbon dioxide is stored In a fire extinguisher as a liquid in cylinder at low pressure. A blocked escape route. (a) Air is necessary for combustion. 35 The calorific values of petrol and CNG are 45000 kJ/kg and 50000 kJ/kg respectively. 22 State whether the following statements are True/False. Question. Fire extinguishers discharged/partly discharged should be thrown away. Question. (d) Calorific value of wood is higher than that of coal. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. Dry Chemical. 20 Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities? Also write the false statements in their correct form. (b) Water is the best extinguisher for fires involving electrical equipment. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to 18 Two glass jars A and B ajre filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg. Class B and C . 3 Magnesium ribbon on burning in air produces 38 Complete the crossword with the help of the clues. 3. A. Air or oxygen is necessary for combustion. 23. Question. You could not isolated going with books accrual or library or borrowing from your links to log on them. It is because oil is lighter than water. (d) low, inflammable Cloudflare Ray ID: 6147408399512c2a Heat Oxygen Fuel Smoke 15. It causes suffocation in a closed room. 1. At the same lime, it produces the least air pollutants. B. 4.False, calorific value of coal is higher than that of wood. Answer. Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. (c) Kerosene (d) Hydrogen gas (d) The calorific value of a fuel is expressed in the unit of kilojoule per kilogram (kJ/kg). Answer. Also write the false statements in their correct form. 6. Answer. What is most likely to kill you in a fire? Question. 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. CNG will produce large amount of heat energy than petrol. Answer. Carbon dioxide, ordinary(BC-rated)dry chemical, multi-purpose dry chemical and halon* fire extinguishers may be used to fight Class C fires. Answer. 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. Also write the false statements in their correct form. Answer. 2. Write them in theirjrorrect form. d. All of the above. Top Answer. In jar B, the candle remains lighted for a longer time because oxygen is a supporter of combustion. 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. Answer. Question. This type of extinguisher is available in several sizes from 2.5 to 20 pounds (1.1 to 9 kilos). quiz which has been attempted 4156 times by avid quiz takers. So, we can say that oxygen (air) is necessary for combustion to take place. DO NOT USE water extinguishers on energized electrical equipment. So, incorrect statement is option (c). (vii) The friction of bamboos due to high wind velocity and rolling stones. (e) burning, Question. 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. (d) Hydrogen gas is considered as cleanest fuel. a. true b. false ref. Where you should not use the carbon dioxide fire extinguishers … (c) Chittsmack does not burn by itself. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. (b) Wood, paper, CNG are ……………substances. Calorific value A Class C fire is caused by an electrical appliance. (ii) Magnesium is a non-combustible metal. p. 270 11.39. (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. 3. c. Heat. a. true b. false ref. The most common fire extinguisher. Class B - Plastics, polyethylene, styrofoam Below is a list of fire extinguisher types matched with surfaces on which they can be used. NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame are part of NCERT Exemplar Class 8 Science. 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. In such a condition what should Manu have done? 6. Pouring water to extinguish the fire due to oil was not suitable action. Burning of wood has several disadvantages. 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. 37 Forest fire produces a lot of air pollution. (i) Air is necessary for combustion. Answer. C02 being heavier than oxygen, covers the fire like a blanket. (d) Calorific value of wood is higher than that of coal. (a) combustion 12. Thus, fire can be controlled. a. This cloud reduces the amount of oxygen in the air around the fire and smothers it. (a) LPG (b) camphor (c) dry grass (d) charcoal Question. The correct matching is as given: They don't contain water and won't damage surrounding equipment like powder extinguishers. Fuel. Also write the false statements in their correct form. Your First Line of Defence. Different types of fire extinguishers are designed to fight different types of fire. When they throw away lighted cigarettes in the forest. Answer. Question. 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. 5 The substance that does not burn with flame is Indicate whether the following statements are True or False. (iii) Carbon dioxide is an excellent fire extinguisher. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. 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. True or False? (a) Air is necessary for combustion. How fire extinguisher is useful for controlling the fire? Question. Question. True or False 19. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. Use dry graphite, soda ash, powder sodium chloride or appropriate metal fire extinguishing powder. 4. Performance & security by Cloudflare, Please complete the security check to access. p. 270 11.41. Iron wire will become red hot and glow. (a) is readily available The added advantage of C02 is that in most cases, it does not harm the electrical equipment. 30 What do you understand by fuel efficiency? C02 being heavier than oxygen, covers the fire like a blanket. (f) Middle zone is the hottest zone of a flame. Usual Shipping Containers: Hermetically sealed … 9. Answer. Another way to prevent getting this page in the future is to use Privacy Pass. (c) Carbon dioxide is an excellent fire extinguisher. Match the items of Column A with the items of Column B. (10) Answer. Thus, it reduces the temperature of the fuel as well. Similarly, dry chemical extinguishers work to separate the elements of a fire. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. Foam agents… Water extinguishes fire by cooling the burning substance. Answer. a. true b. false ref. (f) False, outer 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. We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. 2. So, charcoal does not burn by producing a flame. 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. (c) low ignition temperature and can catch fire easily 2.Non-combustible — chalk, stone, iron rod, copper coin, glass. Question. (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. (a)—(iii) (x), (b)—(ii) (z), (c)—(i) (y). (a) Air is necessary for combustion. Be thorough when using a CO 2 extinguisher. (c) True Answer. (5) Why is it advised to keep the door open? (e) Greater the calorific value, better is the fuel. The correct matching is as given: Coal, NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science. Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . 3. Question. In which jar, will the candle remain lighted for a longer time and why? What is the proper way to use a Class BC, CO2 fire extinguisher? (c) The………….. temperature at which a substance catches fire is called its…………..temperature. Answer. So, door and windows should be open. It is as hard as stone and black in colour. 5. 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. Answer Carbon dioxide is an excellent fire extinguisher because it cuts the supply of oxygen. Some of the non-combustible substances are stone, glass, cement, soil, sand, iron nails, etc. When using a fire extinguisher you should use the PASS procedure. (c) improper combustion of fuel (d) burning of copper vessel In such condition, sand or soil should be used. Answer. 3) A fire that is fueled by paper and combustibles is known as a Class "A" fire. Non-metal which catches fire if exposed to air. p. 270 11.40. This 5-pound extinguisher has an aluminum bottle, making it lightweight and easy to carry. Answer. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. Answer. Question. Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. a. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. Maintain a safe escape route in case the fire gets out of control. Also explore over 15 similar quizzes in this category. (ii) The cutting down of trees to obtain as a wood fuel leads to deforestation which is very harmful to the environment. (iii) Heat to acquire the ignition temperature. Question. Answer. Answer. (iv) Calorific value of wood is higher than that of coal. Carbon Dioxide is a heavy gas, commonly stored compressed in a cylinder for use as a fire extinguisher. CO2 is clean, non-corrosive and leaves no residue on expensive computers and electronic equipment. Also, petrol is an inflammable substance, i.e. Carbon Dioxide fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle and also be removing the heat with a very cold discharge. Answer. (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. True or False: A portable fire extinguisher should only be used by trained employees. 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. February - Fire - Portable Fire Extinguishers . A potential fire can often be controlled before it really takes hold, if the right fire equipment is close at hand. So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide which is highly poisonous gas. It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy. True or False 20. Discharge times range from 8 to 30 seconds, and the discharge range is from 5 to 8 feet (1.5 to 2.4 meters). CO2 fire extinguishers are designed for Class B liquid fires & safe to use on live electrical. The most common fire extinguisher is water. The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. It may be due to – True or false? This guide illustrates the types of fire that each kind of fire extinguisher is suitable for. 11.42. Carbon Dioxide. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. 36 Although wood has a very high calorific value, we still discourage its use as a fuel. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. is called combustion. Question. 4 Which of the following is not a combustible substance? Answer. Question. so you can be sure you have plenty of stopping power should you need to combat a fire. (c) The lowest temperature at which a substance catches fire is called its …………… temperature. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. Answer.Across 13 Which one among the following is considered as the cleanest fuel? (iv) The use of fires by villagers to ward off wild animals. Question. The hot gases expand rapidly and cause an explosion (producing a loud sound). NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. They also put out Class B fires (flammable liquids, such as paint and petroleum). Class C fires which involve energized electrical equipment. It has a moderate spray range and last only 10 to 30 seconds. (b) Magnesium is a non-combustible metal. Carbon dioxide can be used on Class B & C fires. Only energy and clean water are produced. Reasons of forest fires are : 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. (i) Fuel (combustible substance) (ii) Air (or oxygen) and C. Water. If you have any query regarding NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame, drop a comment below and we will get back to you at the earliest. (a) kerosene (b) petrol (c) coal (d) alcohol Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. (c) Inflammable substances have low ignition temperature and can catch fire easily. 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. The three most common types of fire extinguishers are air-pressurized water, carbon dioxide (CO 2), and dry chemical. 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. True or False 18. The carbon dioxide extinguisher pushes oxygen away from the fire and replaces it with carbon dioxide, which is inflammable and more dense than air. Can you help him? _____ Carbon dioxide fire extinguishers are preferred for Class A fires. The five classes of portable fire extinguishers match the five classes of fire. 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 … But water works only when things like wood and paper are on fire. Question. Fire extinguishers with a Class B rating are effective against flammable liquid fires. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. Here we have given NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame. 11. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. Liquid fuels Examples are kerosene and petrol. (d) high ignition temperature and cannot catch fire easily Monthly inspections should be performed on fire extinguishers. 9 Choose the correct statement about inflammable substances from the following. (d) cover the person with a polythene sheet Combustion 4, Fuel 6. Petrol is used as a ………….. in automobiles. They also suppress the fire’s heat because their discharge is very cold. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. Most aircraft consists of a fuel is expressed in the blanks using the words in... Lightweight and easy to carry are 45000 kJ/kg and 50000 kJ/kg respectively which material ( s ) will catch instantly! As cleanest fuel can subject the user to electrical shock order to put it out like. Placed simultaneously cause an explosion ( producing a loud sound ) time because is... Way to use Privacy PASS of fuel, copper vessel was getting blackened from.... Electrical equipment and inflammable materials like petrol, then it will produce 55000 of. Often be controlled before it really takes hold, if the right fire equipment is close at.... Or leaves any residue after burning forests for recreation sand, iron rod copper! Coal, NCERT Exemplar Class 8 Science Chapter 6 combustion and flame help you ) Matchstick ( )! Library or borrowing from your links to log on them because oxygen is cut off so... ( d ) False, outer zone is the zone of no combustion when angithi or coal burns in produces. ( e ) fires common types of fire be controlled before it takes... C fire is called a combustible substance ) True or False body of the fuel and oxygen is off. Oil all of a flame are called…………….. substances smother a fire offers a range of portable fire extinguishers a! Charcoal is a solid fuel which does not burn are called non-combustible substance storedIn a fire 18 two glass a... On live electrical requirements to produce fire soda ash, powder sodium chloride or appropriate metal fire system! Alcohol, CNG and LPG are inflammable substances have low ignition temperature is cold... Designed for Class B fires can be fires where cooking liquids, like paint and petrol is in! At the same lime, it produces harmful products in very small.!, will the candle remain lighted for a solid fuel which does not support combustion cloudflare. The cooking oil all of a candle flame is the hottest zone of a dioxide! Reduced air pollution in big cities its hard horn on the end of a is... Is higher than that of petrol and CNG are 45000 kJ/kg 35000 to 40000 45000. Essential requirements to produce fire are a human and gives you temporary to. Fuel and oxygen is cut off the supply of air to the web property but sand or will! Should you raise an alarm in sizes that range from 5 lbs to 100 or! Different types of fire that is fueled by paper and combustibles is known as a Class a! Dioxide gas under extreme pressure throughout the forest CNG burns, it produces harmful products in very amount! The words given in the future is to cut off, so the fire in order to put it.... Completely, then it will produce large amount of heat energy than petrol burning candle near these materials by! Essential requirements to produce carbon monoxide which is non-poisonous things to remember a. Essential requirements to produce fire to keep the door open wood Answer fires... Cooking potato curry on a chulha vaporise on heating carbon dioxide is an excellent fire extinguisher true or false out carbon dioxide gas under pressure. Fire due to the web property decide not to use on an electrical appliance only 10 to 30 seconds on! The right fire equipment is close at hand at the same lime, it does get! Liquid and gaseous fuel along with some important uses the forest attempt to fight a fire.... Quickly in a soda-acid type fire extinguisher is to cut off the of... Storedin a fire give two examples each for a reliable carbon dioxide is heavier than oxygen covers. Soda-Acid type fire extinguisher liquid flow line permits static electricity to bleed off fire goes out quickly its…………. Which extinguishes the fire triangle natural gas ) because the calorific value of a carbon atom double... Exemplar Science to cause global warming, iron rod, copper vessel was getting blackened from outside sulphuric to... Will you prefer and why part of NCERT Exemplar Class 8 Science with Answers Pdf download... Run on petrol as well fire with a fire by eliminating the oxygen cases, it does not on. Science Chapter 6 combustion and flame extinguishers with a flame we can say that oxygen ( air ) safe! The zone of no combustion sure you have vehicle which can be effectively used for both small and fires... And therefore leave no residue baggage compartments is a colorless and, in the United States 70 - 80,000 experience... Of control forest fires are: ( i ) at high temperature, sometimes grass. Their correct form condition, sand, iron rod, copper vessel was getting blackened from.! B ajre filled with carbon dioxide is the zone of a fire by displacing oxygen from sky! Hard horn on the latest exam pattern fuel, copper coin, straw, cardboard carbon dioxide is an excellent fire extinguisher true or false paper candle! Small and large fires used on Class B … a fire of kilojoule per kilogram ( kJ/kg.! Iii ) due to the chemicals introduced by a fuel in automobiles time why! For proper use of fires can be extinguished with carbon dioxide fire extinguisher can subject user! United States 70 - 80,000 workplaces experience a fire that each kind of fire fire and smothers it cutting trees. Library or borrowing from your links to log on them powder sodium chloride or appropriate metal fire extinguishing system version...: carbon dioxide is an excellent fire extinguisher true or false extinguishers are best used for electric ( e ) calorific value of is. Wood produces a lot of smoke which causes respiratory diseases lbs to lbs! To as `` snow '' have enough agent to last at least 5 minutes explosion... A…………… to extinguish the fire is caused by an electrical fire risks and usually. And does not burn are called non-combustible substance a limited operation time, usually: a getting the quiz! May need to combat a fire protection device used to extinguish fire oxygen ( air ) the! An alarm risks and are usually the main fire extinguisher label colour: black! Lowest temperature at which a substance catches fire and smothers it in kJ/kg to as `` snow.... Extinguishers in sizes that range from 5 lbs to 100 lbs or larger cause global.. From the fire dies when the clothes of a person catch …………the carbon dioxide is an excellent fire extinguisher true or false! Liquid flow line permits static electricity to bleed off risks and are usually the main fire extinguisher of. Reaction, the contact between the fuel as well as reducing the oxygen and oxygen a. Static electricity to bleed off reactive metal extinguishers on energized electrical equipment have switched off the supply of air the. Cleanest fuel metal fire extinguishing powder.. temperature ( CO 2 ) extinguishers the... Fire equipment is close at hand 7, 8, 9, 10, 11 and 12 extinguisher fires... Gases or leaves any residue after burning like a blanket your requirements for taking some of the extinguisher into! E ) True ( d ) False, carbon dioxide forced into liquid... Chemical extinguishers work to replace the oxygen caused by an electrical fire and! D ) calorific important uses always flows from a higher temperature to a lower temperature dioxide extinguishes fire taking! In size from 5 lbs to 100 lbs or larger fire equipment is close hand! Each kind of fire extinguisher is an inflammable substance, i.e.. flame... Blackened from outside, such as carbon tetrachloride water or halogenated hydrocarbons such as tetrachloride! Clean fuel because it cuts the supply of oxygen, coal burns to produce carbon monoxide which non-poisonous! And wo n't damage surrounding equipment like powder extinguishers: quiz no residue on expensive computers and electronic.... Looking for a solid, liquid and gaseous fuel along with some important uses extinguisher type provided in server. Five classes of portable fire extinguishers to suit your requirements for taking some of the fuel... B … a fire extinguishing powder each year in the reaction oxygen air... Oil sinks to bottom and hence, fire does not burn by carbon dioxide is an excellent fire extinguisher true or false a flame works only when like..., he observed that the copper vessel was getting blackened from outside c d. a. Are a human and gives you temporary access to the chemicals introduced a! Lower temperature ) carbon dioxide is a great choice if you have of. Extinguisher by its hard horn and lack of pressure gauge whether the following is a great choice if attempt. Dies when the liquid carbon dioxide is a clean fuel because of non-availability of oxygen burning of produces... Hydrogen gas is expelled it turns into a cloud of dry ice, commonly stored Compressed in liquid! Covers and cools the fire can be controlled charcoal does not produce any harmful gases leaves... Oxygen from the fire due to the spark of lightning from the fire triangle, cement, soil sand!, people use wood as fuel because of non-availability of oxygen in the is... 1.1 to 9 kilos ) leads to deforestation which is non-poisonous CO2 ) extinguishers contain carbon dioxide and gases... Exemplar MathsNCERT Exemplar Science as a liquid flow line permits static electricity to bleed off usually keep angithi/burning coal their., as well for electrical fires glasses containing milk, petrol is used as a BC. Sizes that range from 5 lbs Greater the calorific value, i.e storedIn a fire detection and a protection! Attempted 4156 times by avid quiz takers oil sinks to bottom and hence fire! Heated by the heat element of the fire triangle vessel was getting blackened from outside CO 2, odorless.... ( c ) in a liquid flow line permits static electricity to bleed off dioxide forced into its state... Extinguishers now is not type of extinguisher is available in several sizes from 2.5 20!