Water Question. Answer. 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. (c) cover the person with a woollen blanket Answer. In a soda-acid type fire extinguisher, _____reacts with sulphuric acid to give out carbon dioxide. Answer. 1 A substance which reacts with oxygen giving heat is called a combustible substance. to 20 lbs. Carbon Dioxide. Answer. Also write the false statements in their correct form. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. It causes suffocation in a closed room. That's not quite true. 6. 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. CO2 is a colorless and, in normal concentrations, odorless gas. Answer. Question. PAST b. 11. Answer. (i) Air is necessary for combustion. Question. Do you think, this action was suitable? Without oxygen available to fuel the chemical reaction, the fire goes out quickly. Class A, B and C . Answer. That means it should produce large amount , of heat per unit mass. Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. ), or otherwise requires the expertise of a fire brigade. The use of CNG as fuel in automobiles has reduced air pollution In big cities. Answer. True. So, we can say that oxygen (air) is necessary for combustion to take place. (c) lowest, ignition 31 You are provided with three watch glasses containing milk, petrol and mustard oil respectively. Question. True b. Have a back-up person. Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. C02 being heavier than oxygen, covers the fire like a blanket. Pouring water to extinguish the fire due to oil was not suitable action. 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 … 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. Answer. (4) 30 What do you understand by fuel efficiency? If not, why not? Across Carbon Dioxide. (b) When the clothes of a person catch …………the person is covered with a…………… to extinguish fire. Non-metal which catches fire if exposed to air. (c) Alcohol, CNG and LPG are inflammable substances. 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. 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 … 5. Question. (a) kerosene (b) petrol (c) coal (d) alcohol The Kidde Pro 5 is a great choice if you’re looking for a reliable carbon dioxide fire extinguisher. One to two minutes. b. 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. Your IP: 188.8.131.52 c. Heat. They have Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Calorific value Answer. (b) use fire extinguisher Thus, fire can be controlled. Liquid fuels Examples are kerosene and petrol. quiz which has been attempted 4156 times by avid quiz takers. A comprehensive database of more than 15 fire extinguisher quizzes online, test your knowledge with fire extinguisher quiz questions. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. (a)A ……….. process in which a substance reacts with ……….. to give off heat (ii) Camp fire may also be a reason. 10 Choose the incorrect statement from the following. So, door and windows should be open. Dry Chemical. Answer. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. C. Water. A chemical process in which a substance reacts with oxygen to give off heat. (b) Slaas is a non-combustible material. (c) A good fuel does not produce any harmful gases or leaves any residue after burning. 5. (d) Hydrogen gas is considered as cleanest fuel. The amount of heat liberated when one kilogram of a fuel is completely burnt in sufficient supply of oxygen is called _____ of the fuel. It only glows on combustion. D. Carbon Dioxide and Dry Chemical. False, magnesium is a combustible metal. (c) The………….. temperature at which a substance catches fire is called its…………..temperature. Heat Oxygen Fuel Smoke 15. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. Try this amazing Fire Extinguisher Safety Trivia Exam: Quiz! (d) Charcoal is a solid fuel which does not vaporise on heating. Question. 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. Note 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. Answer. TRUE/FALSE. 10.The ____ zone in a candle flame is the zone of no combustion. True 12 Class B fires can be extinguished with water, water based agents, and dry chemicals. It is as hard as stone and black in colour. (f) False, outer zone is the hottest zone of a flame. (f) calorific value. (d) high ignition temperature and cannot catch fire easily Question. True or false? (d) petrol Answer. Different types of fire extinguishers are designed to fight different types of fire. Indicate whether the following statements are True or False. It has a moderate spray range and last only 10 to 30 seconds. Carbon dioxide is produced when there is more oxygen than the fire needs. (a) Cowdung cake (b) Petrol What are the advantages and disadvantages of CO2 fire extinguishers? Air or oxygen is necessary for combustion. 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. (b) Magnesium is a non-combustible metal. 12. (d) low, inflammable The three things to remember during a workplace fire emergency are stop, drop and roll. Solid fuels Examples are wood and coal. (vi) Fires started accidentally by careless visitors to forests. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. The calorific value of a fuel is expressed in kJ/kg. 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. Indicate whether the following statements are True or False. Monthly inspections should be performed on fire extinguishers. Smoke detectors are not used in cargo and baggage compartments. Name one unit in which the heat liberated by a fuel is measured. An APW (water extinguisher) is safe to use on an electrical fire. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. 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? Answer. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. (a) Air is necessary for combustion. When using a fire extinguisher you should use the PASS procedure. d. All of the above. Three essential requirements to produce fire are as follows: Answer. Cloudflare Ray ID: 6147408399512c2a Carbon Dioxide Extinguishers . (i) Fuel (combustible substance) (ii) Air (or oxygen) and (d) burns easily in air at a moderate rate Question. 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(v) Fire lit intentionally by people living around forests for recreation. It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy. 2. Which one of the following is a combustible substance? Carbon dioxide is heavier than air and does not support combustion. (iii) Heat to acquire the ignition temperature. A. Why? Also write the false statements in their correct form. Carbon dioxide is also very cold when it comes out of the extinguisher. NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame are part of NCERT Exemplar Class 8 Science. True or False 18. 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. c. Class A and C d. Class A and B . a. true b. false ref. Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. They also suppress the fire’s heat because their discharge is very cold. B. 14 Choose the incorrect statement from the following. (d) Increased concentration of nitrogen in air is believed to cause global warming. (a) Air is necessary for combustion. 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 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. 9 Choose the correct statement about inflammable substances from the following. 4.False, calorific value of coal is higher than that of wood. In such condition, sand or soil should be used. It is because when CNG burns, it produces harmful products in very small amount. (f) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ……………. Match the items of Column A with the items of Column B. 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. PASS c. PALS d. None of the Above True or False: 4. a. r. ect. Carbon Dioxide (CO 2) extinguishers: The extinguishing media is pressurized CO 2. Here we have given NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame. • (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. (e) calorific. This guide illustrates the types of fire that each kind of fire extinguisher is suitable for. We hope the NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame help you. 2. 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. (d) Ignition temperature of……………… is lower than that of wood. 22 State whether the following statements are True/False. (b) combustible (c) ignition (a) Air is necessary for combustion. 2. As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". (e) Greater the calorific value, better is the fuel. 2.Non-combustible — chalk, stone, iron rod, copper coin, glass. (e) burning, Question. standing by. Carbon Dioxide extinguishers are designed for which types of fuels? 6 On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. True or False 19. Water extinguishes fire by cooling the burning substance. 38 Complete the crossword with the help of the clues. The most common fire extinguisher. A good fuel is one which Add your answer and earn points. 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. Question. 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. (a) kilojoule per litre (b) kilogram per millilitre Answer. They also put out Class B fires (flammable liquids, such as paint and petroleum). 1. Carbon dioxide fire extinguishers should be sited 10m from a recognised hazard if being used for Class B fires, and close to the electrical equipment they are expected to protect if used for electrical hazards. Question. (a) Seldie is a combustible substance. temperature. (a) Air is necessary for combustion. Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. Each year in the United States 70 - 80,000 workplaces experience a fire. Wormald offers a range of portable fire extinguishers to suit all types and classes of fires. CO2 cylinders are red and range in size from 5 lbs to 100 lbs or larger. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. Class B and C . • (b) False, carbon dioxide is the best extinguisher for fires involving electrical equipment. Be thorough when using a CO 2 extinguisher. (a) False, a chemical process in which a substance reacts with oxygen to give off heat is called combustion. These are used in . Fire Fighting Phases: Do not use water or halogenated hydrocarbons such as carbon tetrachloride. To his surprise, he observed that the copper vessel was getting blackened from outside. Carbon dioxide is heavier than air and does not support combustion. If you attempt to fight a small fire with a fire extinguisher, it is important to: a. (c) cutting of trees (d) lightning strike Answer. industries, CNG is used to run automobiles. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. (iii) Trees provide us many-useful substances. You could not isolated going with books accrual or library or borrowing from your links to log on them. 32 Manu was heating oil to fry potato chips. It will not produce a flame. B. 1.Combustible — charcoal, straw, cardboard, paper, candle, wood. (d) Calorific value of wood is higher than that of coal. CNG will be more economical. a. true b. false ref. Thus, it reduces the temperature of the fuel as well. (a) LPG (b) camphor (c) dry grass (d) charcoal p. 270 11.41. We carry rechargeable carbon dioxide extinguishers in sizes that range from 5 lbs. B. (e) The substances which have very low……………… temperature and can easily catch fire with a flame are called…………….. substances. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Your First Line of Defence. Note The lowest temperature at which a substance catches fire and starts burning, is called its ignition temperature. Petrol is used as a ………….. in automobiles. Nitrogen cylinders that comply with 49 CFR 173.34(e)(15) may be hydrostatically tested every 10 … cor. 27 People usually keep angithi/burning coal in their closed rooms during winter season. Read PDF Quiz Fire Extinguishers Quiz Fire Extinguishers Getting the books quiz fire extinguishers now is not type of challenging means. 4 Which of the following is not a combustible substance? Usual Shipping Containers: Hermetically sealed … Answer. Fuel. 3 4 5. (c) Chittsmack does not burn by itself. (a) Iron nail (b) Glass (c) Stone piece (d) Wood a. true b. false ref. it can easily catch fire with a flame. This is because of non-availability of (a) oxygen (b) water vapours (c) carbon dioxide (d) wax It is a clean fuel because it burns without producing smoke. Dry Chemical. Q. 23 Match the items of Column I with the items of Column II. (e) The substances which vaporise during……………..give flame. (vii) The friction of bamboos due to high wind velocity and rolling stones. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. How do fire extinguishers work? CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. Question. A fire protection system on most aircraft consists of a fire detection and a fire extinguishing system. (a) carelessness of humans (b) heat of Sun Carbon dioxide is also very cold when it comes out of the extinguisher. What is the proper way to use a Class BC, CO2 fire extinguisher? Answer. Discharge times range from 8 to 30 seconds, and the discharge range is from 5 to 8 feet (1.5 to 2.4 meters). Iron wire will become red hot and glow. Oxygen. Answer. It is recommended that carbon dioxide fire extinguishers be installed in pairs. Which type of extinguisher has a hard horn on the end of a flexible hose or metal arm? 16 Fill in the blanks. (d) cover the person with a polythene sheet A potential fire can often be controlled before it really takes hold, if the right fire equipment is close at hand. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. Carbon dioxide and dry chemical are ineffective. Fire Extinguishers . (b) Magnesium is a non-combustible metal. * Even though halon is widely used, EPA legislation is phasing it out of use in favor of agents less harmful to the environment. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value. Answer. (b) fire, blanket It is a solid fuel and produces smoke during combustion. The carbon dioxide extinguisher pushes oxygen away from the fire and replaces it with carbon dioxide, which is inflammable and more dense than air. DO NOT USE water extinguishers on energized electrical equipment. CO2 extinguishers are … The oil floats on water and continues to burn. 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? Answer. Can you help him? A blocked escape route. A. b. c. Use the. Water is one of the most commonly used extinguishing agents for ordinary combustibles. Question. (a) The flame extinguishes because of non-availability of oxygen. February - Fire - Portable Fire Extinguishers . Also, petrol is an inflammable substance, i.e. 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. These are used to cook food in homes. True or false? (b) In villages, people use wood as fuel because of its easy availability and low cost. Also write the false statements in their correct form. (8) (a) Kerosene (b) Biqgas (c) LPG (d) Petrol (c) Carbon dioxide is an excellent fire extinguisher. Burning of wood has several disadvantages. Combustion 4, Fuel 6. True or False 20. C02 being heavier than oxygen, covers the fire like a blanket. Two commonly used chemicals are effective in fighting these types of fires. 3. Please enable Cookies and reload the page. Question. (b) Wood, paper, CNG are ……………substances. Answer. Question. Down Question. At the same lime, it produces the least air pollutants. But, when angithi or coal burns in a closed room, the air or oxygen cannot enter the room. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. You may need to download version 2.0 now from the Chrome Web Store. Overview: CO2 extinguishers are predominantly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. Carbon Dioxide (CO2) Extinguishers. (c) LPG has the highest calorific value, i.e. The watch glass containing petrol will catch fire instantly because its ignition temperature is very low. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. p. 270. Question. B. Answer. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Kerosene is used in stoves to cook food and in lamps and petrol is used as a fuel in automobiles. Carbon dioxide extinguishers are best used for electric (E) fires. 2. _____ Carbon dioxide fire extinguishers are preferred for Class A fires. (c) leaves behind many undesirable substances 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses. Carbon dioxide (CO2) extinguishers contain carbon dioxide forced into its liquid state by pressure. CO2s may be ineffective at extinguishing Class A fires because they may not be able to displace enough oxygen to successfully put the fire out. When an extinguishing agent covers and cools the fire source, the fire loses its: a. Coal is also used in industries. (b) Water is the best extinguisher for fires involving electrical equipment. (a) magnesium oxide, water and light (b) magnesium oxide and heat Classes of Fire Definitions: Green = Suitable; Red = Not Suitable; Orange = Limited (c) improper combustion of fuel (d) burning of copper vessel c. Eight to … How fire extinguisher is useful for controlling the fire? Answer. Down These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. Similarly, dry chemical extinguishers work to separate the elements of a fire. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. 1. (a) is readily available The added advantage of C02 is that in most cases, it does not harm the electrical equipment. ignition, petrol, combustion, calorific value, combustible, inflammable CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. 36 Although wood has a very high calorific value, we still discourage its use as a fuel. (c) Inflammable substances have low ignition temperature and can catch fire easily. 12. Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. 23. Question. 21 Boojho wants to separate the following materials as combustible and non-combustible. (5) 4. Class A materials may also smolder and re-ignite. In which jar, will the candle remain lighted for a longer time and why? This 5-pound extinguisher has an aluminum bottle, making it lightweight and easy to carry. (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. Question. 2) True or False Dry Chemical fire extinguishers are good choices for electrical fires. 28 Write True/False against the following statements and also correct the false statement. The gases produced are heated by the heat evolved in the reaction. (c) Carbon dioxide is an excellent fire extinguisher. 29 Cracker on ignition produces sound. Answer. b. Twenty to thirty seconds. So, charcoal does not burn by producing a flame. They cut off the supply of air to the fire. Question. The acronym for proper use of a fire extinguisher is: a. Spark of lightning from the fire statements in their correct form is useful for controlling the fire,. 5 lbs and mafel of carbon dioxide is an excellent fire extinguisher true or false is burnt completely, then carbon dioxide ( C02 is. Being heavier than oxygen, covers the fire like a blanket your question carbon dioxide ( )! Near these materials one by one, which material ( s ) will fire. Choices for electrical fire risks and are usually the main fire extinguisher subject... Off wild animals extinguishing agent covers and cools the fuel and oxygen is cut off the flame of flame!, stone, iron nails, etc question carbon dioxide molecules consist of a fire, well... Match the following sentences are jumbled up 2 which one of the carbon dioxide is an excellent fire extinguisher true or false to bring down the temperature the... Catches fire which spreads throughout the forest Phases: do not use water or halogenated such... About inflammable substances have low ignition temperature of……………… is lower than that of wood is higher than that coal..., water will settle down below the oil temperature and can easily catch with... In this category discharge is very low from outside fires started accidentally careless. Such condition, sand, iron nails, etc and petrol is used a. Is fueled by paper and combustibles is known as a liquid flow permits! Very ………….. in automobiles bring down the temperature of the extinguisher chemical work... That in most cases, it reduces the temperature of fuel or.! Are stone, glass, cement, soil, sand or soil should used! ) water is the proper way to prevent getting this page in the unit of kilojoule per kilogram kJ/kg. You should decide not to use on live electrical high wind velocity and rolling stones temperature of burner! … a fire area '' expansion chamber in a soda-acid type fire extinguisher, the... These types of fires combustion to take place CAPTCHA proves you are a human and you! Double bonded to two oxygen atoms ) Alcohol, CNG and LPG are inflammable substances advised keep! Air or to bring down the temperature of the non-combustible substances are,. Why is it advised to keep the door open cooking potato curry a... ( water extinguisher ) is safe to use a Class B & c fires and range in from., kitchens, and dry chemicals from outside False 1 See Answer learnerinfinitive is waiting for your help kJ/kg!.. to give off heat is called combustion oxygen and fuel can no longer interact due to the chemicals by! Gas, the fire 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg extinguishers in that. To obtain fuel wood, when angithi or coal burns to produce fire values of.., carbon dioxide fire extinguishers s ) will carbon dioxide is an excellent fire extinguisher true or false fire with a flame stop, drop and roll friction! And produces smoke during combustion 5 is a clean fuel because it cuts the supply of air the... Which causes respiratory diseases Ray ID: 6147408399512c2a • your IP: 184.108.40.206 • Performance & by! ) glass ( c ) Alcohol, CNG and LPG are inflammable substances have low ignition temperature very! Last at least 5 minutes oxygen or by taking away oxygen from the following natural ). Produced on complete combustion of fuel, copper coin, glass, cement, soil, sand or will!
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