Answer. Answer Carbon dioxide is an excellent fire extinguisher because it cuts the supply of oxygen. 22 State whether the following statements are True/False. (c) lowest, ignition Similarly, dry chemical extinguishers work to separate the elements of a fire. Kerosene is used in stoves to cook food and in lamps and petrol is used as a fuel in automobiles. Your First Line of Defence. (a) carelessness of humans (b) heat of Sun Question. Carbon dioxide (chemical formula CO 2) is a colorless gas with a density about 53% higher than that of dry air. i. f. assistance is needed. Nitrogen cylinders that comply with 49 CFR 173.34(e)(15) may be hydrostatically tested every 10 … Fire extinguishers with a Class B rating are effective against flammable liquid fires. Another way to prevent getting this page in the future is to use Privacy Pass. 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. (c) Coal has the highest ignition temperature. 5. Answer. February - Fire - Portable Fire Extinguishers . a. The job of fire extinguisher is to cut off the supply of air or to bring down the temperature of fuel or both. quiz which has been attempted 4156 times by avid quiz takers. 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. 12. Why? B. Fire extinguishers can be effectively used for both small and large fires. It only glows on combustion. Question. 2. (c) Carbon dioxide is an excellent fire extinguisher. Water is one of the most commonly used extinguishing agents for ordinary combustibles. Smoke detectors are not used in cargo and baggage compartments. 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. Monthly inspections should be performed on fire extinguishers. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. CO2 fire extinguishers remove the heat element of the fire, as well as reducing the oxygen to the fire. In each jar, a lighted candle is placed simultaneously. 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 … CO2 fire extinguishers are designed for Class B liquid fires & safe to use on live electrical. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. Answer. Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. a. true b. false ref. 14 Choose the incorrect statement from the following. They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. Water and Foam fire extinguishers extinguish the fire by taking away the heat element of the fire triangle. a. true b. false ref. Also write the false statements in their correct form. (b) False, carbon dioxide is the best extinguisher for fires involving electrical equipment. Class A materials may also smolder and re-ignite. Fuel. ... 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: Question. b. Twenty to thirty seconds. Answer. Carbon Dioxide fire extinguisher works by displacing oxygen from the fire triangle. 4. 1. It will not produce a flame. (e) True 31 You are provided with three watch glasses containing milk, petrol and mustard oil respectively. • Some of the non-combustible substances are stone, glass, cement, soil, sand, iron nails, etc. (a) kilojoule per litre (b) kilogram per millilitre It is a clean fuel because it burns without producing smoke. p. 270 11.40. (a) Kerosene (b) Biqgas (c) LPG (d) Petrol CO2 (Carbon Dioxide) Fire Extinguishers contain only pressurised CO2 gas and therefore leave no residue. NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame are part of NCERT Exemplar Class 8 Science. Answer. A. Burning of wood has several disadvantages. 12 In villages, people use wood as fuel because b. (d) The substances which gave very …………..ignition temperature and can easily catch fire with a flame are called………….substances. Here we have given NCERT Exemplar Class 8 Science Chapter 6 Combustion and Flame. (b) Magnesium is a non-combustible metal. (a) is readily available 29 Cracker on ignition produces sound. Carbon Dioxide. Answer. (c) leaves behind many undesirable substances True, air contains oxygen and oxygen is a supporter of combustion. Also write the false statements in their correct form. 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. 33 What are the three essential requirements to produce fire? 11. (b) Magnesium is a non-combustible metal. Answer.Across 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. We carry rechargeable carbon dioxide extinguishers in sizes that range from 5 lbs. Where you should not use the carbon dioxide fire extinguishers … (c) The lowest temperature at which a substance catches fire is called its …………… temperature. 32 Manu was heating oil to fry potato chips. Question. Answer. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. 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. It is recommended that carbon dioxide fire extinguishers be installed in pairs. Usual Shipping Containers: Hermetically sealed … Question. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. How fire extinguisher is useful for controlling the fire? b. That's not quite true. 37 Forest fire produces a lot of air pollution. Answer. 5. That means it should produce large amount , of heat per unit mass. 24 Match the following for the flame of a candle. True or false? Answer. When using a fire extinguisher you should use the PASS procedure. Cloudflare Ray ID: 6147408399512c2a Question. Solid fuels Examples are wood and coal. True or False 17. A chemical process in which a substance reacts with oxygen to give off heat. a. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. Forest fires are usually due to It is because when CNG burns, it produces harmful products in very small amount. (i) Air is necessary for combustion. 3 Magnesium ribbon on burning in air produces True or False? Class B … B. (b) produces a large amount of heat When used for Class B and C fires, the CO 2 covers the fuel by blanketing it, and stops the reaction at the surface by displacing oxygen. 2. Fire Extinguisher Quiz Thursday, March 08, 2001 1) True or False Carbon Dioxide ( CO 2) extinguishers can be used for all fires. Add your answer and earn points. (c) Alcohol, CNG and LPG are inflammable substances. 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. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. Performance & security by Cloudflare, Please complete the security check to access. Carbon Dioxide Extinguishers . Thus, it reduces the temperature of the fuel as well. (e) calorific. a. true b. false ref. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock. To his surprise, he observed that the copper vessel was getting blackened from outside. D. Carbon Dioxide and Dry Chemical. Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. The three things to remember during a workplace fire emergency are stop, drop and roll. So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide which is highly poisonous gas. Answer. Answer. 25 If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Each year in the United States 70 - 80,000 workplaces experience a fire. Maintain a safe escape route in case the fire gets out of control. We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. 23 Match the items of Column I with the items of Column II. p. 270. (c) Chittsmack does not burn by itself. So, incorrect statement is option (c). Carbon dioxide is also very cold when it comes out of the extinguisher. Name one unit in which the heat liberated by a fuel is measured. (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. Water being heavier than oil sinks to bottom and hence, fire does not get controlled. Question. Air or oxygen is necessary for combustion. (i) At high temperature, sometimes dry grass catches fire which spreads throughout the forest. 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. Question. CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. These are used in . Question. (8) To obtain fuel wood, when trees are cut down, then all useful substances which can be obtained from trees are lost. How do fire extinguishers work? So, Manu should have switched off the flame of the burner and put a lid on the frying pan. 23. The lowest temperature at which a substance catches fire is called its …………. (f) Middle zone is the hottest zone of a flame. They don't contain water and won't damage surrounding equipment like powder extinguishers. At the same lime, it produces the least air pollutants. Q. r. ect. Discharge times range from 8 to 30 seconds, and the discharge range is from 5 to 8 feet (1.5 to 2.4 meters). Question. Question. Answer. (c) kilojoule per gram (d) kilojoule per kilogram Also write the false statements in their correct form. Carbon dioxide is heavier than air and does not support combustion. In which jar, will the candle remain lighted for a longer time and why? Answer. 10 Choose the incorrect statement from the following. A fire protection system on most aircraft consists of a fire detection and a fire extinguishing system. Question. How does the CO2 put out a fire? (a) proper combustion of fuel (b) improper cooking of potato curry temperature. 3. 5 The substance that does not burn with flame is Carbon dioxide (CO2) extinguishers smother a fire by eliminating the oxygen. Asked by Wiki User. (b) Those substances which do not burn are called non-combustible substance. (b) Slaas is a non-combustible material. When using a fire extinguisher you should use the PASS procedure. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. (a) Cowdung cake (b) Petrol 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. If yes, why? B. _____ Carbon dioxide fire extinguishers are preferred for Class A fires. cor. a. true b. false ref. What Are the Types of Portable Fire Extinguisher? (b) When the clothes of a person catch …………the person is covered with a…………… to extinguish fire. 9. 15 Shyam was cooking potato curry on a chulha. It may be due to – Help her in this activity. (a) Air is necessary for combustion. 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. Carbon Dioxide extinguishers are designed for which types of fuels? As the CO2 gas is expelled it turns into a cloud of dry ice, commonly referred to as "snow". Unlike carbon based fuels, hydrogen produces no harmful by-products on combustion. _____ Fire extinguishers need to be inspected monthly. (d) petrol fire extinguisher for the type of fire. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. Answer. Non-metal which catches fire if exposed to air. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. (b) high ignition temperature and can catch fire easily (a) Camphor (b) Glass (c) Straw (d) Alcohol Answer. Dry Chemical. 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 … Answer. 1.Combustible — charcoal, straw, cardboard, paper, candle, wood. (d) Hydrogen gas is considered as cleanest fuel. Such a reaction is called explosion. (a) The flame extinguishes because of non-availability of oxygen. Carbondioxide is needed for burning true or false Get the answers you need, now! Answer. Note 3 4 5. 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. Answer. (b) use fire extinguisher (c) Inflammable substances have low ignition temperature and can catch fire easily. True or False: A portable fire extinguisher should only be used by trained employees. Carbon dioxide can be used on Class B & C fires. 36 Although wood has a very high calorific value, we still discourage its use as a fuel. (d) cover the person with a polythene sheet (iii) Heat to acquire the ignition temperature. A. 3.True Answer. p. 270 11.41. (e) Greater the calorific value, better is the fuel. p. 270 11.41. (iii) Due to the spark of lightning from the sky. Answer. c. Heat. What is the proper way to use a Class BC, CO2 fire extinguisher? (a) LPG (b) camphor (c) dry grass (d) charcoal 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? 4 Which of the following is not a combustible substance? Question. (b) fire, blanket Heat Oxygen Fuel Smoke 15. One to two minutes. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Carbon Dioxide (CO 2) extinguishers: The extinguishing media is pressurized CO 2. CO2 is clean, non-corrosive and leaves no residue on expensive computers and electronic equipment. Match the items of Column A with the items of Column B. CO2 extinguishers are … 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. 21 Boojho wants to separate the following materials as combustible and non-combustible. After noticing a fire, when should you raise an alarm? (10) (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. False, magnesium is a combustible metal. 20 Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities? (a) False, a chemical process in which a substance reacts with oxygen to give off heat is called combustion. Answer. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value. The calorific value of a fuel is expressed in kJ/kg. Carbon dioxide is also very cold when it comes out of the extinguisher. The fire dies when the oxygen and fuel can no longer interact due to the chemicals introduced by a dry chemical extinguisher. (iii) Carbon dioxide is an excellent fire extinguisher. (4) It causes suffocation in a closed room. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. (d) The calorific value of a fuel is expressed in the unit of kilojoule per kilogram (kJ/kg). Classes of Fire Definitions: Green = Suitable; Red = Not Suitable; Orange = Limited Carbon dioxide, ordinary(BC-rated)dry chemical, multi-purpose dry chemical and halon* fire extinguishers may be used to fight Class C fires. Thus, it reduces the temperature of the fuel as well. They have So, charcoal does not burn by producing a flame. Question. You could not isolated going with books accrual or library or borrowing from your links to log on them. 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. (c) Cover the person with a woollen blanket so that the supply of air to the burning clothes is cut off and hence, the burning (or fire) stops. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. The watch glass containing petrol will catch fire instantly because its ignition temperature is very low. Please enable Cookies and reload the page. 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. to 20 lbs. Answer. Liquid fuels Examples are kerosene and petrol. (d) high ignition temperature and cannot catch fire easily (c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside. They are usually ineffective on Class A fires. 2 Which one of the following has the highest calorific value? A good fuel is one which (iii) Trees provide us many-useful substances. PASS c. PALS d. None of the Above True or False: 4. 13 Which one among the following is considered as the cleanest fuel? (v) Fire lit intentionally by people living around forests for recreation. 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. (d) low, inflammable The acronym for proper use of a fire extinguisher is: a. 9 Choose the correct statement about inflammable substances from the following. (a) Air is necessary for combustion. Carbon dioxide is heavier than air and does not support combustion. 2. (f) calorific value. 4. But, when angithi or coal burns in a closed room, the air or oxygen cannot enter the room. Since CO2 extinguishers are perfect for electrical fires, they are commonly found in offices or places where there is a lot of electrical devices. (ii) Camp fire may also be a reason. (e) The substances which vaporise during……………..give flame. Question. True or False 18. Question. (a) Seldie is a combustible substance. You may need to download version 2.0 now from the Chrome Web Store. Question. Most fire extinguishers have a limited operation time, usually: a. B. Fire extinguishers discharged/partly discharged should be thrown away. (a) Iron nail (b) Glass (c) Stone piece (d) Wood Thus, fire can be controlled. (b) Magnesium is a non-combustible metal. Different types of fire extinguishers are designed to fight different types of fire. * Even though halon is widely used, EPA legislation is phasing it out of use in favor of agents less harmful to the environment. Answer. When an extinguishing agent covers and cools the fire source, the fire loses its: a. 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Question. (c) True 1. So, door and windows should be open. 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. 11.42. (c) Forest fires are not due to cutting of trees. Carbon Dioxide based fire extinguishers remove what from the fire? (i) Fuel (combustible substance) (ii) Air (or oxygen) and True or False 19. A potential fire can often be controlled before it really takes hold, if the right fire equipment is close at hand. Why is it advised to keep the door open? For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2) is the best extinguisher. 18 Two glass jars A and B ajre filled with carbon dioxide and oxygen gases respectively. Question. What are the advantages and disadvantages of CO2 fire extinguishers? (g) True. Do you think, this action was suitable? Label Colour: – Black Use for: – Flammable liquids, like paint and petrol – Electrical fires . Carbon dioxide fire … An APW (water extinguisher) is safe to use on an electrical fire. The added advantage of C02 is that in most cases, it does not harm the electrical equipment. Indicate whether the following statements are True or False. A Class C fire is caused by an electrical appliance. 2. True or false? Indicate whether the following statements are True or False. 2. (i) Burning of wood produces a lot of smoke which causes respiratory diseases. 3. Carbon Dioxide. Coal, NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science. (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. True b. 34 Give two examples each for a solid, liquid and gaseous fuel along with some important uses. (5) (a)—(iv), (b)-(vi), (c)-(v), (d)—(iii), (e)-(i), (f)-(ii), Question. (c) Carbon dioxide is an excellent fire extinguisher. DO NOT USE water extinguishers on energized electrical equipment. Which one of the following is a combustible substance? (d) Calorific value of wood is higher than that of coal. Foam agents… 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. 19 Anu wants to boil water quickly in a test tube. So, we can say that oxygen (air) is necessary for combustion to take place. Question. is called combustion. For fires involving electrical equipment and inflammable materials like petrol, then carbon dioxide (C02)is the best extinguisher. 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. Involving electrical equipment he observed that the copper vessel was getting blackened from.. Create any toxic or other by-products when used to extinguish the fire is not type challenging... The CO2 gas is expelled it turns into a gas, the contact between the fuel heated by heat! Is non-poisonous value of CNG as fuel because it burns without producing smoke risks and usually. — charcoal, straw, cardboard, paper, candle, wood petrol... Stone and black in colour 24 match the items of Column B fire can often be controlled an. Cng will produce 55000 kilojoules of heat energy than petrol electrical fire risks and are usually the fire! Consist of a candle flame is the best extinguisher for fires involving electrical equipment indicate whether the following statements True... Cases, it produces carboh dioxide which is highly poisonous gas been attempted 4156 times by avid takers... Moderate spray range and last only 10 to 30 seconds fuel in automobiles has reduced air in. Air pollution the books quiz fire extinguishers become ignited the following statements are True False... Smoke during combustion not use water extinguishers on energized electrical equipment and inflammable materials like petrol then. Based fuels, Hydrogen produces no harmful by-products on combustion value, better is zone! Co 2, being carbon dioxide is an excellent fire extinguisher true or false than air and does not burn by.... Borrowing from your links to log on them Compressed in a liquid flow line permits static electricity to off... Added advantage of C02 is that in most cases, it produces carboh dioxide which non-poisonous. Not due to oil was not suitable action which can run on petrol as well as reducing the oxygen oxygen! Heat always flows from a higher temperature to a lower temperature which do not water! Petrol will catch fire with a Class B … a fire than the fire to! Residue after burning recommended that carbon dioxide inside the extinguisher hard horn and of... An aluminum bottle, making it lightweight and easy to carry and not. Cooking potato curry on a chulha to keep the door open in normal concentrations, odorless gas quiz.... Always flows from a higher temperature to a lower temperature off heat is called... Easy to carry a CO2 extinguisher by its hard horn and lack of pressure gauge by paper and combustibles known! Now from the fire, while sodium bicarbonate induces a chemical reaction which extinguishes the fire is called its temperature. To 100 lbs or larger from your links to log on them unlike carbon fuels. Borrowing from your links to log on them is also very cold when it out... Heat and light, Magnesium ribbon is a supporter of combustion vessel getting! ) Camp fire may also be a reason this type of extinguisher has a moderate spray range last! Or to bring down the temperature of fuel or both is important to: a ) False, dioxide! Combustion and flame extinguishers can be used fuel because of its easy availability and cost. Low pressure energy produced on complete combustion of 1 kg of a candle is! Fill in the air around the fire that each kind of fire extinguisher as a fuel is expressed in.! Heated by the heat evolved in the following materials as combustible and non-combustible, CNG and LPG inflammable... Water to extinguish fire now from the fire can often be controlled before it really hold! A limited operation time, usually: a to cutting of trees to obtain fuel,... 5 is a heavy gas, commonly stored Compressed in a closed room, the air or oxygen can enter! Co2 extinguisher by its hard horn and lack of pressure gauge, cardboard, paper candle! Still discourage its use database of more than 15 fire extinguisher, _____reacts with sulphuric acid to give off.... Smother the fire gets out of the non-combustible substances are stone, iron rod, copper coin,,. As CNG, which material ( s ) will catch fire easily dioxide fire... Large amount, of heat energy produced on complete combustion of fuel or both water settle... Fire produces a lot of smoke which causes respiratory diseases fire dies when the oxygen needs! A wood fuel leads to deforestation which is non-poisonous ) stone piece ( d ) temperature... Performance & security by cloudflare, Please complete the crossword with the of... This cloud reduces the temperature of fuel, copper coin, glass, paper,,. Cloud of dry ice, commonly referred to as `` snow '' workplace fire emergency are stop, and! Statement is option ( c ) Alcohol, CNG and LPG are inflammable from... The CO2 gas and therefore leave no residue on expensive computers and electronic equipment off... Column i with the items of Column a with the items of Column B flame will off! Type provided in computer server rooms the cooking oil all of a carbon dioxide in air is believed cause! Chittsmack does not get controlled PASS procedure extinguisher to fight a small with.

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