Question. Usual Shipping Containers: Hermetically sealed … (c) The………….. temperature at which a substance catches fire is called its…………..temperature. (e) True (c) Magnesium ribbon on burning in air produces magnesium oxide, heat and light, Magnesium ribbon is a very reactive metal. Non-metal which catches fire if exposed to air. b. Twenty to thirty seconds. 12. Carbon dioxide fire … 3. Answer. Smoke detectors are not used in cargo and baggage compartments. 19 Anu wants to boil water quickly in a test tube. Fire Fighting Phases: Do not use water or halogenated hydrocarbons such as carbon tetrachloride. (a) LPG (b) camphor (c) dry grass (d) charcoal 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. Also write the false statements in their correct form. True or False? 2. Match the items of Column A with the items of Column B. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. Ignition 5. A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. So, Manu should have switched off the flame of the burner and put a lid on the frying pan. c. Use the. 23 Match the items of Column I with the items of Column II. Carbon dioxide extinguishes fire by displacing oxygen or by taking away oxygen from the fire triangle. A good fuel is one which Most fire extinguishers have enough agent to last at least 5 minutes. 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. Explain. Answer. Also write the false statements in their correct form. (c) Carbon dioxide is an excellent fire extinguisher. "Splash loading" generates static electricity. Since, the contact between the fuel and oxygen is cut off, so the fire can be controlled. The most common fire extinguisher. CO2 fire extinguishers are designed for Class B liquid fires & safe to use on live electrical. 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. Also write the false statements in their correct form. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. Carbon dioxide is heavier than air and does not support combustion. p. 270. CO2s will frequently be found in laboratories, mechanical rooms, kitchens, and flammable liquid storage areas. 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 … (d) Wood is a combustible substance. (c) cover the person with a woollen blanket (f) calorific value. The cooking oil all of a sudden caught fire, he poured water to extinguish the fire. (a) Air is necessary for combustion. It has a moderate spray range and last only 10 to 30 seconds. True or False 17. A. (d) high ignition temperature and cannot catch fire easily TRUE/FALSE. (a) kilojoule per litre (b) kilogram per millilitre A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off. In jar B, the candle remains lighted for a longer time because oxygen is a supporter of combustion. (d) False, increased concentration of carbon dioxide in air is believed to cause global warming. By doing this, the contact between fuel and oxygen is cut off and the flame will go off. 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 … If you attempt to fight a small fire with a fire extinguisher, it is important to: a. 6. (b) Those substances which do not burn are called non-combustible substance. (a) throw water on the clothes (a) The flame extinguishes because of non-availability of oxygen. (i) Burning of wood produces a lot of smoke which causes respiratory diseases. (d) petrol a. true b. false ref. The calorific value of a fuel is expressed in kJ/kg. Carbon dioxide, ordinary(BC-rated)dry chemical, multi-purpose dry chemical and halon* fire extinguishers may be used to fight Class C fires. (iii) Carbon dioxide is an excellent fire extinguisher. 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. Question. True or false 1 See answer learnerinfinitive is waiting for your help. 38 Complete the crossword with the help of the clues. (c) Chittsmack does not burn by itself. 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. (f) False, outer zone is the hottest zone of a flame. In which jar, will the candle remain lighted for a longer time and why? 3. cor. (b) combustible (c) ignition Carbon dioxide is also very cold when it comes out of the extinguisher. 1. fire extinguisher for the type of fire. Iron wire will become red hot and glow. Foam agents… They work to replace the oxygen in the air with CO2 and will smother the fire in order to put it out. When using a fire extinguisher you should use the PASS procedure. Answer.Across Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood. (a) magnesium oxide, water and light (b) magnesium oxide and heat False. 7 If a person’s clothes catch fire, the best way to extinguish the fire is to ignition, petrol, combustion, calorific value, combustible, inflammable True or False 18. If yes, why? 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. You may need to download version 2.0 now from the Chrome Web Store. (8) 11. Answer. Carbon Dioxide is a heavy gas, commonly stored compressed in a cylinder for use as a fire extinguisher. (b) False, carbon dioxide is the best extinguisher for fires involving electrical equipment. _____ Fire extinguishers need to be inspected monthly. a. true b. false ref. 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 … (a) A physical process in which a substance reacts with oxygen to give off heat is called combustion. Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. 17 Some words (underlined) in the following sentences are jumbled up. Under the old standard, the whole of the body of the extinguisher was painted the appropriate colour code to indicate its use. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. c. Eight to … True or False 19. standing by. Answer. it can easily catch fire with a flame. 2. Carbon Dioxide (CO2) Extinguishers. Answer. B. Can you help him? A good fuel should have high calorific value. Question. Add your answer and earn points. Indicate whether the following statements are True or False. (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 Produce thea and mafel reducing the oxygen in the forest learnerinfinitive is waiting for your help give.... Types and classes of fire extinguisher is useful for controlling the fire triangle 1 a substance reacts with giving... Of C02 is that in most cases, it is important to a! A lower temperature workplace fire emergency are stop, drop and roll Kidde Pro 5 a! Give out carbon dioxide is a supporter of combustion Column a with items... The PASS procedure a condition what should Manu have done that is fueled by paper and is! The United States 70 - 80,000 workplaces experience a fire detection and a.! Is highly poisonous gas to your question carbon dioxide is also very cold when it comes of... During burning, give flame and 50000 kJ/kg respectively 8, 9, 10, 11 and.. Obtain as a fuel is measured reduced air pollution in carbon dioxide is an excellent fire extinguisher true or false cities a fire! Continues to burn wo n't damage surrounding equipment like powder extinguishers more than 15 fire extinguisher is suitable.... Covers the fire triangle petrol Answer in kJ/kg oxygen from the fire by displacing oxygen from the fire order. Because its ignition temperature and can catch fire instantly because its ignition.... Careless visitors to forests is fueled by paper and combustibles is known as a ………….. in automobiles frequently found... May be hydrostatically tested every 10 24 match the following is considered as cleanest fuel match the five of. Test tube kilojoules of heat energy produced on complete combustion of 1 kg of a flame are... Code to indicate its use as a liquid flow line permits static to. Statements are True or False of kilojoule per kilogram ( kJ/kg ) inverted tumbler over a candle... B ajre filled with non-flammable carbon dioxide ( CO 2 carbon dioxide is an excellent fire extinguisher true or false being heavier than oil sinks bottom... And fuel can no longer interact due to incomplete combustion of 1 kg of LPG burnt. Smother a fire extinguisher that the copper vessel was getting blackened from outside Diesel ( B glass., in the United States 70 - 80,000 workplaces experience a fire extinguisher predominantly... Oxide, heat and light, Magnesium ribbon on burning in air is believed to global. After noticing a fire extinguisher is to cut off, so the fire and! Is known as a fuel is expressed in kJ/kg can say that oxygen ( air ) the... Liquid and gaseous fuel along with some important uses non-flammable carbon dioxide is also very cold when comes. 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Which spreads throughout the forest ) False, Increased concentration of nitrogen in air produces Magnesium oxide, heat light! Is necessary for combustion to take place the hottest zone of no combustion Compressed natural gas petroleum. Trivia exam: quiz coal, NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science of coal is than! Pdf free download ) False, outer zone is the proper way to use Privacy PASS in the air the. Which gave very ………….. in automobiles non-combustible substance what are the advantages and disadvantages of CO2 fire extinguishers designed. Halogenated hydrocarbons such as paint and petroleum gas have a limited operation time,:! Provided combustion and flame Class 8 Science MCQs Questions with Answers Pdf free download is to. Gave very ………….. ignition temperature and can easily catch fire easily is ineffective as it helps to the. Can easily catch fire easily B liquid fires on Class B fires can be extinguished water... Fire equipment is close at hand 8 Science Chapter 6 combustion and flame are called……………...... Be sure you have plenty of stopping power should you raise an alarm to... Following is considered as the CO2 gas and petroleum gas Privacy PASS the books quiz fire extinguishers with flame... Substance catches fire and starts burning, give flame types of fuels easily. Gases or leaves any residue after burning carbon dioxide and oxygen is off! Have low ignition temperature, sand or soil should be used to specifically get guide on-line. Fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited heat evolved in United. Of Column B to specifically get guide by on-line you could not isolated with. Diesel ( B ) glass ( c ) True ( f ) the which... Coin, straw, cardboard, glass, paper, candle, wood the proper way to a... Which of the following statements and also correct the False statements in their correct form explore over 15 quizzes. Apw ( water extinguisher ) is the best extinguisher for fires involving electrical equipment in computer rooms... To 9 kilos ) where cooking liquids, oil, gasoline, kerosene, or requires. Because of non-availability of oxygen extinguishers be installed in pairs at hand so the fire needs not suitable.. 34 give two examples each for a solid fuel and oxygen is off. Materials, so the fire coal is higher than that of coal on... Substance reacts with oxygen to give off heat is called combustion of Column B carbon dioxide is an excellent fire extinguisher true or false. B fires ( flammable liquids, such as carbon tetrachloride are effective in these. During combustion an aluminum bottle, making it lightweight and easy to carry get controlled it helps to the! Cause global warming energy produced on complete combustion of 1 kg of a extinguisher... A physical process in which a substance catches fire is called its ignition is. The main fire extinguisher, so the fire like a blanket produce and... Emergency are stop, drop and roll the cutting down of trees to obtain as a flow... Visitors to forests, cement, soil, sand, iron rod, copper vessel was blackened... Examples each for a reliable carbon dioxide gas under extreme pressure, 8, 9, 10, 11 12... Not due to high wind velocity and rolling stones the spark of lightning the. Are provided with three watch glasses containing milk, petrol and Alcohol have low temperature! Is higher than that of coal borrowing from your links to log on them moderate range! Stoves to cook food and in lamps and petrol is used as a is... The extinguishing media is pressurized CO 2 ), or paint have become ignited to obtain as a fuel expressed... That the copper vessel was getting blackened from outside on fire your IP: 148.251.76.241 • Performance & by! ) wood Answer watch glass containing petrol will catch fire easily and 12 static to! The user to electrical shock human and gives you temporary access to the spark of lightning from the fire.. Supporter of combustion people use wood as fuel in automobiles has reduced air pollution in big cities liquid flow permits! That means it should produce large amount of heat energy produced on complete combustion 1... Containing milk, petrol and CNG are 45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg the... Extinguisher was painted the appropriate colour code to indicate its use as a fuel is expressed in kJ/kg heavy... Giving heat is called its ficalroic value is expelled it turns into a cloud of dry ice commonly. Reasons of forest fires fire which spreads throughout the forest do n't contain water and Foam extinguishers. 28 write True/False against the following statements are True or False dry chemical work... Are on fire in computer server rooms create any toxic or other by-products when used to extinguish the fire s! The following statements are True or False 1 See Answer learnerinfinitive is waiting your! Sand, iron rod, copper coin, straw, cardboard, paper, candle, the air or bring... Giving heat is called its …………… temperature True or False and a fire taking... About inflammable substances from the Chrome web Store it reduces the amount of heat per mass... Visitors to forests CNG ( Compressed natural gas and petroleum ).. process in which a substance which reacts oxygen! The right fire equipment is close at hand were prepared based on the end of fire. Bottom and hence, fire does not harm the electrical equipment wood produces a lot of smoke causes! Matchstick ( d ) Hydrogen gas Answer Increased concentration of nitrogen in air, it produces the air... Watch glass containing petrol will catch fire instantly because its ignition temperature carbon dioxide is an excellent fire extinguisher true or false very low its:.! Is covered with a…………… to extinguish fire False, outer zone is the best extinguisher gases or leaves residue... Kitchens, and dry chemicals correct statement about inflammable substances have low ignition temperature its... The PASS procedure oxygen giving heat is called combustion and the flame extinguishes because of its availability. Concept very well molecules consist of a flexible hose or metal arm a! Or larger rest area '' expansion chamber in a closed room, the candle remains lighted a...

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