This shows that ignition temperature of kerosene oil is lower than that of wood. When using electrical equipment in classified areas, such as lighting fixtures in Class I, Div. Sujit took four different beakers I, II, III, and IV each containing 1 litre water. Transportation regulations distinguish fuels as either flammable or combustible depending upon their flashpoint. Download a PDF of free latest Sample questions with solutions for Class 8, Science, CBSE- Combustion and Flame . ... Ignition temperature – For catching fire, a combustible substance must reach its ignition temperature. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. State the conditions under which combustion occurs. I. Answer: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. Question 2. These solutions for Combustion And Fossil Fuels are extremely popular among Class 8 students for Science Combustion And Fossil Fuels Solutions come handy for quickly completing your homework and preparing for exams. Iron nail b. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 6 Combustion and Flame. Access Lakhmir Singh Science Class 8 Solutions For Chapter 6 Very Short Answer Type Questions. Fuels. Answer: Ignition temperature is the minimum temperature at which combustion starts in a substance. If several different flammable materials may be present within a particular area, the material that gives the lowest auto ignition temperature dictates the overall area classification, and hence T-class. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. 2. (ii) Presence of O2 (supporter of combustion) (iii) Heating to its ignition temperature. Therefore, when selecting equipment, the Temperature class must be below the auto-ignition temperature of the potentially explosive atmosphere where it will be installed. Water is a very good fire extinguisher as it cools down the fuels such as wood below its ignition temperature. The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature of a substance. Question from very important topics are covered by NCERT Exemplar Class 8.You also get idea about the type of questions and method to answer in your Class 8th examination. Among the given options coal Lets we the following activity which shows that a substance cannot bum until it reaches its ignition temperature. II. Ignition temperature: The minimum temperature at which combustion starts in a substance is called ignition temperature of that substance. Solution: Ignition temperature is the lowest temperature at which a substance catches fire. b. low ignition temperature and low calorific value. All types of questions are solved for all topics. Spontaneous combustion take place at room temperature.The heat required for spontaneous combustion is produced inside the substance by its slow oxidation.It is usually undergone by those substances which have quite low ignition temperature. Answer. Class 8 Chemistry Combustion and Flame: Ignition temperature: Ignition temperature. 2 locations, it’s an NEC requirement that the surface temperature of the fixture doesn’t exceed 80% of the autoignition temperature (AIT) of the gas or vapor involved, or shall be marked with a temperature code (T-Code) [501.130(B)]. You can also get complete NCERT solutions and Sample papers. NCERT Exemplar Solutions for Class 8 Science Chapter 6 Combustion and Flame is provided here in PDF format. The lowest temperature at which a substance catches fire is called its ignition temperature; Certain substances have very low ignition temperature and can easily catch fire with a flame are called inflammable substances like petrol, LPG etc. 2. The flash point is a descriptive characteristic that is used to distinguish between flammable fuels, such as gasoline (also known as petrol), and combustible fuels, such as diesel.. In this chapter, the students will learn about combustion, types of combustion, flames, the structure of a flame. We know, if the temperature of the fuel will be lower than the room temperature, the tn i can ... CBSE Class 8 Science Chapter 6 Combustion and Flame Objective Questions . ... thank you madam I am of 8 th class it helped me lot. List conditions under which combustion can take place. With an increase in pressure the autoignition temperature … Why does the fire goes off when water is poured over burning wood? ... A matchstick, a piece of wood or a can full of kerosene do not catch fire on their own because the ignition temperature of these substance are higher that the room temperature (25 °C). Class 8 Science Solved Q&A. Science In Everyday Life Solutions for Class 8 Science Chapter 5 Combustion And Fossil Fuels are provided here with simple step-by-step explanations. petrol, alcohol, etc. Question 5: What is an inflammable substance? Which of the following has lower ignition temperature? (d) 9. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. c. high ignition temperature and high calorific value. 4. It is also used to characterize the fire hazards of fuels. Good fuels have a. low ignition temperature and high calorific value. Ignition temperature is the lowest temperature at which a combustible substance catches fire. Water is commonly used to control fires. Boiling point b. Melting point c. Ignition temperature d. Critical temperature Ans.9(c) 10. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Answer: (B) A substance which reacts with oxygen giving heat is called a combustible substance. A class that stores temperature information, and allows conversion between different units. Difference between types of fuels has been explained. ... Q10: What is ignition temperature? Temperature codes have built-in safety factors. petrol, alcohol, etc. a. Definition. Unlike with flash points, the ignition temperature does not need an ignition source. Inflammable substances have very low ignition temperature. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. 8 Which one of the following is combustible? Also, he took four fuels W, X, Y, and Z. Q12: Can a matchstick catch fire on its own on room temperature? Class 8 Science Chapter 4 Combustion and Flame Combustion and Flame Combustion Process of giving off heat by a substance after reaction with oxygen is called combustion. 2 ranges from 527 to 558 Kelvin, and Diesel fuel No .4 is 536 Kelvin. The lowest temperature at which a substance catches fire and undergoes combustion liberating heat and light is called ignition temperature. Flash point - the lowest temperature at which vapour of a volatile material can be ignited whit an ignition source present; Values of autoignition temperature are generally higher than flash point, as given for pure hydrocarbons in the tables and figures below . Previous Johny Johny Yes Papa | Nursery Rhymes & Kids Songs. (c) attainment of ignition temperature of the substance. View Answer. Continue Reading. Inflammable Substance: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. Ignition Temperature. The lowest temperature at which a Substance catches fire is called its-a. Attainment […] Fire can be controlled by removing one or more requirements essential for producing fire. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Booster 2. Question 1. Class 8 Science Solved Q&A. Then, he started heating the water in beakers I, … Propane - Thermophysical properties - Chemical, Physical and Thermal Properties of Propane Gas - C 3 H 8; Standard Grade Coal - Heat Value - Standard grades coal and heating values; Toluene - Density and Specific Weight - Linear temperature expansion coefficients for aluminum, copper, glass, iron and other common materials Presence of a combustible substance: Combustion is only possible if the substance is combustible. The flash point of a volatile liquid is the lowest temperature at which it can vaporise to form an ignitable mixture in air. More... #include View Answer. a. EDUCATION YouTube Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT By admin 8 mins ago . For example, a log of wood has higher ignition temperature than cut pieces of wood. Answer: Combustion can take place in the presence of: (a) a combustible substance. Flammable fuels have a flashpoint below 38°C 100.4 °F 311.15 K In other words, the ignition temperature is the lowest temperature at which a volatile material will be vaporised into a gas which ignites without the help of any external flame or ignition source. Combustion and Flame class 8 living science solution A. Formative and Summative Assessment 1. ... Ignition temperature is the lowest temperature at which a substance catches fire. Reply. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT. Students can solve NCERT Class 8 Science Combustion and Flame MCQs Pdf with Answers to know their preparation […] Wood b. Ans: The conditions under which combustion occurs are: (i) Presence of a combustible substance. 5. The ignition temperature of Diesel fuel No.1 ranges from 450 to 602 Kelvin, Diesel fuel No. CBSE Class 8 Science, CBSE- Combustion and Flame. Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. 1. (b) oxygen, that is, the supporter of combustion. What are the Conditions Necessary for Combustion Conditions Necessary for Combustion The following conditions are necessary for combustion to take place. Chapter 6. Presence of a supporter of combustion: Adequate supply of a supporter of combustion (e.g., oxygen) is essential for combustion. Define the ignition temperature of a substance. NCERT Exemplar for Class 8 Science Chapter 6 Combustion and Flame Multiple Choice Questions 1. Eileen Tang -- 2005 prefaces d. high ignition temperature and low calorific value. Q11: Different substances catch fire at different _____ View Answer. Glass c. Stone pieces d. Paper Ans.8. 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