Answer: Ignition temperature is the minimum temperature at which combustion starts in a substance. 1. 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. Answer: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. Solution: Ignition temperature is the lowest temperature at which a substance catches fire. 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. The lowest temperature at which a substance catches fire and undergoes combustion liberating heat and light is called ignition temperature. NCERT Exemplar Solutions for Class 8 Science Chapter 6 Combustion and Flame is provided here in PDF format. b. low ignition temperature and low calorific value. II. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. Define the ignition temperature of a substance. Water is commonly used to control fires. EDUCATION YouTube Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT By admin 8 mins ago . The flash point of a volatile liquid is the lowest temperature at which it can vaporise to form an ignitable mixture in air. I. Boiling point b. Melting point c. Ignition temperature d. Critical temperature Ans.9(c) 10. More... #include Eileen Tang -- 2005 prefaces 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.. You can also get complete NCERT solutions and Sample papers. 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. The ignition temperature of Diesel fuel No.1 ranges from 450 to 602 Kelvin, Diesel fuel No. Attainment […] Fuels. Inflammable substances have very low ignition temperature. Good fuels have a. low ignition temperature and high calorific value. 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. Flammable fuels have a flashpoint below 38°C 100.4 °F 311.15 K Lets we the following activity which shows that a substance cannot bum until it reaches its ignition temperature. With an increase in pressure the autoignition temperature … Booster 2. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Presence of a supporter of combustion: Adequate supply of a supporter of combustion (e.g., oxygen) is essential for combustion. List conditions under which combustion can take place. Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. Fire can be controlled by removing one or more requirements essential for producing fire. ... Q10: What is ignition temperature? Ans: The conditions under which combustion occurs are: (i) Presence of a combustible substance. Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT. Reply. Wood b. 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. The lowest temperature at which a Substance catches fire is called its-a. ... 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). MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Class 8 Chemistry Combustion and Flame: Ignition temperature: Ignition temperature. Ignition temperature: The minimum temperature at which combustion starts in a substance is called ignition temperature of that substance. Combustion and Flame Class 8 Science NCERT Textbook Questions. Temperature codes have built-in safety factors. 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. ... thank you madam I am of 8 th class it helped me lot. When using electrical equipment in classified areas, such as lighting fixtures in Class I, Div. ... Ignition temperature – For catching fire, a combustible substance must reach its ignition temperature. Also, he took four fuels W, X, Y, and Z. This shows that ignition temperature of kerosene oil is lower than that of wood. Among the given options coal (ii) Presence of O2 (supporter of combustion) (iii) Heating to its ignition temperature. In this chapter, the students will learn about combustion, types of combustion, flames, the structure of a flame. Students can solve NCERT Class 8 Science Combustion and Flame MCQs Pdf with Answers to know their preparation […] Inflammable Substance: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. Science In Everyday Life Solutions for Class 8 Science Chapter 5 Combustion And Fossil Fuels are provided here with simple step-by-step explanations. For example, a log of wood has higher ignition temperature than cut pieces of wood. 8 Which one of the following is combustible? NCERT Exemplar for Class 8 Science Chapter 6 Combustion and Flame Multiple Choice Questions 1. Question 1. petrol, alcohol, etc. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 6 Combustion and Flame. What are the Conditions Necessary for Combustion Conditions Necessary for Combustion The following conditions are necessary for combustion to take place. Presence of a combustible substance: Combustion is only possible if the substance is combustible. 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)]. a. 4. Ignition temperature is the lowest temperature at which a combustible substance catches fire. The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature of a substance. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. A class that stores temperature information, and allows conversion between different units. Then, he started heating the water in beakers I, … Question 2. State the conditions under which combustion occurs. View Answer. Iron nail b. (d) 9. 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 . Definition. 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. CBSE Class 8 Science, CBSE- Combustion and Flame. (c) attainment of ignition temperature of the substance. Sujit took four different beakers I, II, III, and IV each containing 1 litre water. It is also used to characterize the fire hazards of fuels. Answer: (B) Unlike with flash points, the ignition temperature does not need an ignition source. petrol, alcohol, etc. Combustion and Flame class 8 living science solution A. Formative and Summative Assessment 1. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. View Answer. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. All types of questions are solved for all topics. Question 5: What is an inflammable substance? Therefore, when selecting equipment, the Temperature class must be below the auto-ignition temperature of the potentially explosive atmosphere where it will be installed. d. high ignition temperature and low calorific value. 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 Continue Reading. Chapter 6. Download a PDF of free latest Sample questions with solutions for Class 8, Science, CBSE- Combustion and Flame . c. high ignition temperature and high calorific value. Why does the fire goes off when water is poured over burning wood? Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. Previous Johny Johny Yes Papa | Nursery Rhymes & Kids Songs. Access Lakhmir Singh Science Class 8 Solutions For Chapter 6 Very Short Answer Type Questions. Class 8 Science Solved Q&A. 2. Transportation regulations distinguish fuels as either flammable or combustible depending upon their flashpoint. ... Ignition temperature is the lowest temperature at which a substance catches fire. Q12: Can a matchstick catch fire on its own on room temperature? Ignition Temperature. Class 8 Science Solved Q&A. 2 ranges from 527 to 558 Kelvin, and Diesel fuel No .4 is 536 Kelvin. Glass c. Stone pieces d. Paper Ans.8. (b) oxygen, that is, the supporter of combustion. 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