www.embibe.com. Question 1. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. The diagram below shows George using his laptop. Good fuels have a. low ignition temperature and high calorific value. A fuel with least calorific value. Name the unit in which the calorific value of a fuel is expressed. Points to Remember: Hydrogen is the most abundant element found in the universe. Textbook Solutions Balbharati Solutions NCERT Solutions RD Sharma Solutions RD Sharma Class 10 Solutions RD Sharma Class 9 Solutions Lakhmir Singh Solutions HC Verma Solutions … (i) On the diagram above draw a ray of light to show how George sees the light from the lamp reflected by the laptop screen. Hydrogen is much more common in the form of compounds. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. Get it as soon as Thu, Dec 3. List conditions under which combustion can take place. CNG is a cleaner fuel. What is Candle Flame? (A) pollution A candle's flame. Carefully observe and describe the characteristics of a candle flame. such as: - sulphur dioxide, oxides of nitrogen, and oxides of sulphur etc.in a very small amounts. The heat produced was measured to be 180,000 kJ. Other options New and used from $25.19. EduRev is like a wikipedia just for education and the Different Zones of Candle Flame Class 8 Video | EduRev images and diagram are even better than Byjus! Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water. It is blue because it directly meets with the oxygen of the air, and is the hottest part of the flame… 8. Luminara Flameless Candle: 360 Degree Top, Vanilla Scented Moving Flame Candle with Timer (4" Ivory) 4.7 out of 5 stars 205. (a) Burning of wood and coal causes’ ______of air. Practice more on Combustion And Flame. Explain. ... Make a labelled diagram of a candle flame. 99 $39.99 $39.99. Which zone of a flame does a goldsmith use for melting gold and silver and why? Log in. A gas produced during combustion which causes acid rain. Explain how CO2 is able to control fires. Measure and record the height h of the candle flame. Last updated at May 26, 2020 by Teachoo. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Combustion of fuels like petroleum causes formation of unburnt carbon particles along with CO gas. (iv) No residue remain after combustion. Then add the wick and flame. 9. MEDIUM. View Answer. Ltd. 308, iThum Towers, A-40, Noida 201301. Northwest Crown Fire Experiment, Canada. NCERT Solutions for Class 8 Science Chapter 6 – 3 Mark Questions and Answers. Heat produced by burning 1 kg of fuel = 180,000 kJ/4.5 kg = 40,000 kJ/kg. A lit candle is covered with an inverted jar in a saucer of water, the flame expires and water rises up into the jar. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Diagram of candle flame and label the parts are shown in the picture Hope this may help you. Question 1. So LPG is a better domestic fuel than wood. But normally you want to bottom of the flame to start wide, and narrow down to the top. Calorific value = (Heat produced) (kJ) / (Mass of Fuel) (in kg), The calorific value of the fuel is 40000 (kJ/Kg). CO2 forms a blanket around the fire, cutting off the air supply, due to which the fire gets extinguished. Class- VIII-CBSE-Science Combustion And Flame. d. high ignition temperature and low calorific value. Class-8 » Science. (b) Slags is a non-combustible material. Calculate the calorific value of the fuel. asked Jun 8, 2018 in Class X Science by priya12 ( -12,631 points) Class 8. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame. This document is highly rated by Class 8 students and has been viewed 2053 times. ... Ans: Candle flame: Light a candle and observe its flame. It consists of hot, unburnt vapours of the combustible material. Write them in their correct form. The candle flame has 4 zones from innermost to outermost: 1)Blue zone: It is near the base of the flame. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. saisathwik2 saisathwik2 18.04.2018 Chemistry Secondary School +5 pts. These gases cause respiratory diseases. After step 2, you already have a very basic candle. Answer: Question 7. The combustion and flame solutions given here can help students to prepare the topics in an interactive manner. NCERT solutions Class 8 Science Chapter 6 Combustion and Flame is one of the most crucial resources for Class 8 students. Abida kept the beaker near the wick in the yellow part of the candle flame. Selina Concise ICSE Solutions for Class 8 Chemistry Chapter 7 Hydrogen. Fig. The lesson covers the complete explanation of class 8 Chapter 16 Light. It does not leave behind any undesirable substances. (C) ignition temperature The chief sources of hydrogen are water, acids and alkalies. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. The candle gets extinguished but the gas bums with a pop sound. Let us now understand the structure of flames with the context of the flames of a candle. Due to this reason iron is not considered as combustible substance. Science NCERT Grade 8, Chapter 6, Combustion and Flame discusses in detail the chemical processes involved in burning and its associated concepts. (b) LPG is a better domestic fuel than wood. Get it as soon as Fri, Nov 20. The unit of calorific value is kilojoule per kilogram (kJ/kg). NCERT Exemplar for Class 8 Science Chapter 6 Combustion and Flame 17. Other options New from $25.39. 8. (c) Fuel must be heated to its ______ _______ before it starts burning. Light the "upright" candle and permit it to burn for one minute. Answer: Ignition temperature is the lowest temperature at which a substance catches fire. It is the place where wax burns completely or complete cumbustion takes place. What is the difference between the burning of a candle and the burning of a fuel like coal? Fuel may be a) Solid only b) Solid,Liquid or gas c) Liquid only d) Gas only. (d) Some substances on combustion produce thea and mafel. Make a Labelled Diagram of a Candle Flame. The lesson also has a look … (D) Fire produced by oil cannot be controlled by ............... . Ans: The simple fire extinguisher is the soda-acid type fire extinguisher. beyond the centre of curvature (2F) of convex lens as shown in Fig. Answer: The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). (B) Presence of supporter of combustion. Name the type of nuclear reaction taking place in … Next: NCERT Question 7→ Class 8; Chapter 6 Class 8 - Combustion And Flame; NCERT Questions. (b) A liquid fuel used in … Tabular representation of materials which produce flames on burning is included. Define ignition temperature of a substance. Explain how CO 2 is able to control fires. It burns easily in air at a moderate rate and it produces a large amount of heat. LPG is a good fuel as compared to wood as it readily available and it is cheap. Answer: Ignition temperature is the lowest temperature at which a substance catches fire. Whose water will get heated in a shorter time? Solution: Combustion can be defined as a process of reaction of a substance with oxygen. (d) Fire produced by oil cannot be controlled by _________ . Some words (underlined) in the following sentences are jumbled up. Should you have any queries/clarifications please leave your details below and we will call you shortly. Practice more on Combustion And Flame. Moisture increases the ignition temperature of leaves. 3. The use of CNG in place of petrol and diesel reduce pollutions in following ways: Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Question 8. Determine what part of the candle is burning. Light from the lamp is reflected by the laptop screen. Answer: Extra Questions for Class 10 Science Chapter 10 Short Answer Type I. The diagram below shows George using his laptop. NCERT Question 6 - Chapter 6 Class 8 - Combustion And Flame. Just above the blue zone is called dark zone. Draw a labelled diagram of a candle flame and explain what happens in each zone. The conditions under which combustion takes place are as follows:-. Make a labelled diagram of candle flame. (A) Water is a good conductor of electricity. View Answer. Attainment of ignition temperature. Q23: Introduce a glass plate into the luminous zone of the steady candle flame and hold it for few seconds, then remove it? Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. 2. If the height of the flame is 2.4 cm, find the height of its image. Name the unit in which the calorific value of a fuel is expressed. (A) Water is not used to control fires involving electrical equipment. Name the unit in which the calorific value of a fuel is expressed. Goldsmiths blow the outermost zone of a flame with a metallic blow-pipe for melting gold and silver. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Abida kept the beaker near the wick in the yellow part of the candle flame. Next: NCERT Question 7→ Class 8; Chapter 6 Class 8 - Combustion And Flame; NCERT Questions. (ii) It produces less carbon dioxide gas. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. Answer. So, calorific value of fuel = 40,000 kJ/kg. List conditions under which combustion can take place. In which zone of a candle flame does complete combustion take place? 5% off. In an experiment 4.5 kg of a fuel was completely burnt. The most important compound of hydrogen is water. A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. Time allowed: 03 Hours Maximum Marks: 80 ... 12 Rohit focused the image of a candle flame on a white screen using a convex lens. Question 8. (c) Fuel must be heated to its Ignition temperature before it starts burning. ... Place a lighted candle inside the jar. Dry leaves do not contain moisture, so they catch fire easily. What are the main constituents of biogas and kitchen gas (L.P.G.)? It is also known as dark zone of the flame. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. 12. (c) The ray diagram will be as follows: (d) Yes, concave mirror can be used to obtain a diminished image. Ramesh kept the beaker in the outermost part of the flame. Share with your friends. CO2, being heavier than oxygen, covers the fire like a blanket. Revisewise Education Solutions Pvt. A goldsmith uses the non-luminous zone (outermost zone) of candle flame to melt gold and silver because it is the hottest part of the candle flame and has most temperature. Log in. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). This is a general chemistry lab which I use at the beginning of the semester to review the concept of chemical and physical change. 8. The different zones of a candle flame can be described as follows: 1. The different zones of a candle flame can be described as follows: 1. Difference between types of … Determine and record the weight of each candle and its holder. SOLUTION: The unit of calorific value is kilojoule per kilogram (kJ/kg). Living Science Solutions for Class 8 Science Chapter 6 Combustion And Flame are provided here with simple step-by-step explanations. What is the nature of the mirror? The water heated by Ramesh will get heated in a shorter time because he kept his beaker near the hottest zone of the flame. Hydrogen is prepared by the action of water, acids … Similar lights may be found on a railway platform.When urban electric power distribution became ubiquitous in developed countries in the 20th century, lights for urban streets followed, or sometimes led. A chemical process in which a substance reacts with oxygen to give off heat is called a) Conduction b) Conjunction c) Combustion d) Confusion. Any three examples of solid fuels. (B) LPG is a better domestic fuel than wood. For today's students, learning can happen anytime, anywhere. Different zones of candle flame. Browse more Topics under Combustion And Flame. Introduction to candle flame concept tells about the components and structure of flame. Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water. Use a ruler. (d) How is hydrogen gas collected? Q2. (b) A liquid fuel, used in homes is ______. Answer: (b) 3. Draw the ray diagrams showing the image formation by a concave lens. (The lowest temperature at which a substance catches fire is called its ignition temperature). (d) Fire produced by oil cannot be controlled by water. Ignition temperature is different for different substances. A street light, light pole, lamppost, street lamp, light standard or lamp standard is a raised source of light on the edge of a road or path. (a) Seldie is a combustible substance. The outermost part of the flame is the hottest one, so Rakesh’s water will get heated in a shorter time. 2. Any three examples of gaseous fuels. Make a labelled diagram of a candle flame. Do check out the sample questions of Different Zones of Candle Flame Class 8 Video | EduRev for Class 8, the answers and examples explain the meaning of chapter in the best manner. $32.99 $ 32. Here the candle flame is considered as the object AB. $25.51 $ 25. Sep 13, 2020 - Worksheet : Combustion & flame Class 8 Notes | EduRev is made by best teachers of Class 8. He noted down the position of the candle , screen and lens as under : Position of candle = 26.0 cm Position of convex lens = 50.0 cm Position of screen = 74.0 cm What is the focal length of the convex lens? A lilac-coloured flame is produced on heating. The innermost zone: The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns. The fourth zone of the candle (sometimes call the veil) is the faint outside blue edge that extends from the blue zone at the base of the flame and up the sides of the flame cone. What did you observe on the glass plate? Selina Concise ICSE Solutions for Class 8 Chemistry Chapter 7 Hydrogen. Make a labelled diagram of a candle flame . b. low ignition temperature and low calorific value. 11. Explain. Rusting can take place at room temperature but combustion need an ignition temperature. Combustion and Flame. Draw the ray diagrams showing the image formation by … The image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 60 cm from the optical centre of the lens. Thereafter, a detailed discussion on the flame and structure of flame is mentioned in the chapter, Combustion and Flame. $32.99 $ 32. Make a labelled diagram of candle flame. Name the unit in which the calorific value of a fuel is expressed. Process of production of energy in sun. FREE Shipping by Amazon. MEDIUM. Left: Flame on Earth; Right: Flame on the ISS. Presence of supporter of combustion i.e., oxygen. Share 2. The lesson covers the complete explanation of class 8 Chapter 16 Light. A street light, light pole, lamppost, street lamp, light standard or lamp standard is a raised source of light on the edge of a road or path. 6.2 Different zones of Candle flame ... of a candle flame to melt gold and silver because it is the hottest zone and has more temperature. An important liquid fuel, used in home is _____. Draw ray diagrams to show the nature, position and relative size of the image formed by a concave lens Water is not used to control the fire involving electrical equipment because it is a good conductor of electricity. (C) The ignition temperature of paper is less, so it catches fire easily. Timings: 10.00 am to 7.00 pm Monday to Friday (Saturday till 2:30 pm), Explore all our videos and questions with 3 day Free trial. (b) To get magnified image, the student should put the candle flame between fand 2f. Fill in the blanks: (a) Burning of wood and coal causes’ ______of air. Difference between types of fuels has been explained. A bright blue region near the wick is called the blue zone. 51 $26.92 $26.92. Calculate the calorific value of the fuel. For this, you will need to closely observe the flames of an ordinary candle. View Answer. Name the unit in which the calorific value of a fuel is expressed. Advertisement. Form candle holders from the wire as shown in the diagram. Candles produce light by releasing heat and all the turn on the candle produces come from a chemical reaction known as combustion in which wax reacts with oxygen in the air to produce carbon dioxide. Make a labelled diagram of a candle flame. Diagram :- Explanation :-1. Answer: 7. Answer. It consists of hot, unburnt vapours of the combustible material. (i) On the diagram above draw a ray of light to show how George sees the light from the lamp reflected by the laptop screen. Candle of Hope -purple2. Can the process of rusting be called combustion? 1.It has more calorific value about 55000 kJ/Kg. (b) A liquid fuel, used in homes … SOLUTION: Q 7. Click here to get an answer to your question ️ Draw the diagram of candle flame and label all zones 1. Combustion and Flame class 8 living science solution A. Formative and Summative Assessment 1. FREE Shipping by Amazon. Define ignition temperature of a substance. 1. Draw a neat and well-labelled diagram for the laboratory preparation ofhydrogen. A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 m from its pole. A matchstick, a piece of … It has less calorific value about 17000 to 22000 kJ/Kg. Similar lights may be found on a railway platform.When urban electric power distribution became ubiquitous in developed countries in the 20th century, lights for urban streets followed, or sometimes led. And to be honest, it doesn’t look bad at all! It needs lot of space to store and also very difficult to transport. (b) A liquid fuel, used in homes is Liquefied Petroleum Gas (LPG). Name the gaseous fuels. It is also known as dark zone of the flame. State, whether the image formed, is erect or inverted. Solution: Combustion can be defined as a process of reaction of a substance with oxygen. SOLUTION: Q 7. The heat produced was measured to be 180,000 kJ. 2. List conditions under which combustion can take place. So you can be creative with how your flame looks like. Any three examples of inflammable substances. NCERT Question 1 NCERT Question 2 NCERT Question 3 NCERT Question 4 … S Chand Science Class 8 Solutions Chapter 6 Combustion and Flame Lakhmir Singh Science Class 8 Chapter 6 Very Short Answer Type Questions Question 1. Ask your question. Back of Chapter Questions . 1. 1. info@entrancei.com 011-47340170 . 1. Answer: The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg). Fuel must be heated to its ____ temperature before it starts burning. Class 8; Math; Science; Class 9; Class 10; Confusion Adda; Blog; Home; Class 8; Science; ... Make a labelled diagram of candle flame. Answer: (c) 2. Find its focal length. Combustion and Flame class 8 living science solution A. Formative and Summative Assessment 1. (A) Burning of wood and coal causes ............. of air. Question 1. Goldsmith blowing through a metallic pipe. Ask your question. Class 8 - Chemistry - Combustion and Flame. Class 8 Science Solved Q&A. Join now. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. Back of Chapter Questions . Weigh the candle … S Chand Science Class 8 Solutions Chapter 6 Combustion and Flame Lakhmir Singh Science Class 8 Chapter 6 Very Short Answer Type Questions. Q 8. Explain how the use of CNG in automobiles has reduced pollution in our cities. Fire is affected by gravity. (i) It produces less carbon monoxide gas. Sunil’s water will get heated faster than Amit’s water because outermost part of candle flame is the hottest. (iii) Draw ray diagram to justify your answer to part (ii) ... Rohit focused the image of a candle flame on a white screen using a convex lens. (A) Presence of a combustible substance. CBSE NCERT Solutions for Class 8 Science Chapter 6 . Q11. https://classnotes.org.in/class-8/combustion-and-flame/structure-of-flame So you can be creative with how your flame looks like. The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Light Page 7 of 8 Q10a. www.embibe.com. Make a labelled diagram of a candle flame. Therefore, the use of diesel and petrol as fuels in automobiles is, being replaced by CNG (Compressed Natural Gas), as CNG produces harmful products. CBSE NCERT Solutions for Class 8 Science Chapter 6 . (a) Burning of wood and coal causes pollution of air. 75. 13. List conditions under which combustion can take place. The conditions necessary for combustion to take place are as follows: Fill in the blanks. The added advantage of CO2 is that in most cases it does not harm the electrical equipment. 14. Tick the correct answer : 1. The process of rusting cannot be called combustion because in this process no heat and light is produced. Advertisement. Explain how the use of CNG in automobiles has reduced pollution in our cities. Discuss. Page - 1 . But if the flame gets too little or too much air or fuel, it can flicker or flare and unburned carbon particles (soot) will escape from the flame before they can fully combust. The innermost zone: The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns. Page - 1 . (a) Water is not used to control fires involving electrical equipment. Place the lighted candle flame in front of convex lens beyond the twice of the aproximate focal length, i.e. Explain. Light from the lamp is reflected by the laptop screen. Which zone of a flame does a goldsmith use for melting gold and silver and why? (C) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not. The coldest part of candle flame. NCERT Solution for Science Textbook For Class 8 (2018 (Latest)) Chapter 6: Combustion and Flame Q: 6 | Page no. Ans. Make a labelled diagram of a candle flame. The term combustion is defined and explained in detail with the help of activities. 3. These solutions for Combustion And Flame are extremely popular among Class 8 students for Science Combustion And Flame Solutions come handy for quickly completing your homework and preparing for exams. Answer: Extra Questions for Class 10 Science Chapter 10 Short Answer Type I. MEDIUM. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. What name is given to the substances 'which can burn easily? 2. But normally you want to bottom of the flame to start wide, and narrow down to the top. The lesson covers all important questions based on combustion and flame. Explain how CO 2 is able to control fire. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat so paper does not attain its ignition temperature. The third candle is pinkish because it is the colour to show the anticipation of Easter. Whose water will get heated in a shorter time? Explain how CO 2 is able to control fires.. Answer: Carbon dioxide is denser than air and forms a layer around the burning substance.It covers the fire like a blanket due to which fresh air cannot reach the burning substance.The burning substance does not get oxygen of air and hence stops burning. Students can download Class 10 Science Chapter 10 Light Reflection and Refraction Important Questions, ... such as a candle flame, through a straight tube. SOLUTION: The unit of calorific value is kilojoule per kilogram (kJ/kg). Name the unit in which the calorific value of a fuel is expressed. (C) Heating the combustible substance to its ignition temperature. (B) A liquid fuel, used in homes is .............. . Welcome To Champstreet. Ignition temperature is different for different substances. FREE Shipping by Amazon. As it is the hottest zone (complete combustion) of the flame. A circular blackish ring on the glass plate kept over the candle flame indicates _____. You can also get free sample papers, Notes, Important Questions. Lowest price in 30 days. Answer Subscribe to our Youtube Channel - https://you.tube/teachoo. (B) LPG has more calorific value than wood and LPG produces no pollution. Name the unit in which the calorific value of a fuel is expressed. Which zone of a flame does a … For example; LPG, petrol, natural gas, etc. (c) Chittsmack does not burn by itself. He noted down the position of the candle , screen and lens as under : Position of candle = 26.0 cm Position of convex lens = 50.0 cm Position of screen = 74.0 cm i) What is the focal length of the convex lens? Combustion will not occur in the absence of any one of these. Ramesh kept the beaker in the outermost part of the flame. Class- VIII-CBSE-Science Combustion And Flame. 1. Concepts of fuel and fuel efficiency are also explained. (a) Burning of wood and coal causes _________ of air. The green leaves contain some water due to which the ignition temperature of leaves increases and they do not catch fire easily while dry leaves have no water so they catch fire easily. Answer Subscribe to our Youtube Channel - https://you.tube/teachoo. Paper by itself catches fire easily because it is a highly combustible substance. Total mass of fuel = 4.5 kg Can the process of rusting be called combustion? Explain, with the help of a labelled diagram. Answered The candle flame can have different shapes and sizes depending on the wind, temperature, etc. It conducts electricity and may result electric shock. Question 8. Other options New and used from $25.19. As it burns, record the colors, size, and shape of the candle flame. The candle flame can have different shapes and sizes depending on the wind, temperature, etc. NCERT Question 6 - Chapter 6 Class 8 - Combustion And Flame. Answer: The unit in which the calorific value of a fuel is expressed is kilojoules per kilogram (kJ/kg). The chapter begins with a short discussion on fuels and burning of materials. Luminara Flameless Candle: 360 Degree Top, Vanilla Scented Moving Flame Candle with Timer (4" Ivory) 4.7 out of 5 stars 205. Luminara Flameless Candle: 360 Degree Top, Vanilla Scented Moving Flame Candle with Timer (8" Ivory) 4.8 out of 5 stars 24. Make a labelled diagram of a candle flame. Join now. make a well labeled diagram of a candle flame and explain it. Our mission is to improve 6th to 10th outcomes for all students and make learning more intuitive, more interesting, more personalised and more affordable. All NCERT textbook questions have been solved by our expert teachers. ... Q22: Explain different zone of a candle flame with a diagram. Infer the products of the combustion . (D) water. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO2) is the best extinguisher. Why a matchstick does not catch fire on its own at room temperature? Light Class 8 Science Chapter 16 as per NCERT Book used in CBSE and other Schools. … Discuss. (Advent is Christmas lent is Easter DAH!1. Context for Use. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Introduction and Types of Combustion; In troduction to Fuel and Fuel Efficiency; Understand the Flame of a Candle. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE- Combustion and Flame . Students test their explanations by experimenting with different Candle of Preparation -purple3. For example; LPG, petrol, […] Step 3: add the details. Topics covered are combustion, flame and fuels. Photo of a fire taken with a 1/4000th of a second exposure. Different zones of a candle flame are diagrammatically represented. View Answer. Q 8. Class – X . The wick is a solid line in the middle of the cylinder. Green leaves contain moisture, so they do not catch fire. Note down the position of lighted candle (c). Explain how CO 2 is able to control fire. It is difficult to burn a heap of green leaves but dry leaves catches fire easily. (C) Fuel must be heated to its ................. ............ before it starts burning. Answer: A substance does not catch fire until its temperature is raised to its ignition temperature. When the object is placed beyond 2f, then the image formed will be diminished one. No, as rusting is a very slow process as compared to combustion and the heat evolve in combustion is much more than rusting. It contains unburnt particles of wax. A quietly burning candle flame is a very efficient combustion machine. c. high ignition temperature and high calorific value. The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Light Page 7 of 8 Q10a. Combustion and flame Worksheet-6 . (B) kerosene Use a ruler. But we cannot see the same through a bent tube. (iii) It produces less amount of sulphur dioxide and nitrogen dioxide which cause acid rain. Combustion and Flame Class 8 Science MCQs Pdf. Explain how CO 2 is able to control fires. Since the contact between the fuel and oxygen is cut off, the fire is controlled. Explain how CO2 is able to control fires. Total heat produced = 180,000 kJ
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