Temperature codes have built-in safety factors. The flash point of a volatile liquid is the lowest temperature at which it can vaporise to form an ignitable mixture in air. Answer: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. Class 8 Science Solved Q&A. 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. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. Eileen Tang -- 2005 prefaces Presence of a combustible substance: Combustion is only possible if the substance is combustible. The lowest temperature at which a Substance catches fire is called its-a. a. (b) oxygen, that is, the supporter of combustion. State the conditions under which combustion occurs. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. Fuels. Answer: (B) (c) attainment of ignition temperature of the substance. Class 8 Science Solved Q&A. II. 5. Inflammable Substance: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. You can also get complete NCERT solutions and Sample papers. Boiling point b. Melting point c. Ignition temperature d. Critical temperature Ans.9(c) 10. Definition. (ii) Presence of O2 (supporter of combustion) (iii) Heating to its ignition temperature. Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. In this chapter, the students will learn about combustion, types of combustion, flames, the structure of a flame. NCERT Exemplar for Class 8 Science Chapter 6 Combustion and Flame Multiple Choice Questions 1. 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 . More... #include Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. View Answer. Answer: Combustion can take place in the presence of: (a) a combustible substance. Presence of a supporter of combustion: Adequate supply of a supporter of combustion (e.g., oxygen) is essential for combustion. 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)]. Previous Johny Johny Yes Papa | Nursery Rhymes & Kids Songs. 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. Download a PDF of free latest Sample questions with solutions for Class 8, Science, CBSE- Combustion and Flame . Solution: Ignition temperature is the lowest temperature at which a substance catches fire. The lowest temperature at which a substance catches fire and undergoes combustion liberating heat and light is called ignition temperature. The ignition temperature of Diesel fuel No.1 ranges from 450 to 602 Kelvin, Diesel fuel No. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 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. A substance which reacts with oxygen giving heat is called a combustible substance. a. Glass c. Stone pieces d. Paper Ans.8. Why does the fire goes off when water is poured over burning wood? Reply. Science In Everyday Life Solutions for Class 8 Science Chapter 5 Combustion And Fossil Fuels are provided here with simple step-by-step explanations. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. ... Ignition temperature is the lowest temperature at which a substance catches fire. Difference between types of fuels has been explained. 2. Ignition Temperature. 1. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 6 Combustion and Flame. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. View Answer. Combustion and Flame Class 8 Science NCERT Textbook Questions. CBSE Class 8 Science, CBSE- Combustion and Flame. 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. Sujit took four different beakers I, II, III, and IV each containing 1 litre water. Class 8 Chemistry Combustion and Flame: Ignition temperature: Ignition temperature. Which of the following has lower ignition temperature? Ignition temperature is the lowest temperature at which a combustible 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. 2. Continue Reading. EDUCATION YouTube Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT By admin 8 mins ago . With an increase in pressure the autoignition temperature … It is also used to characterize the fire hazards of fuels. Therefore, when selecting equipment, the Temperature class must be below the auto-ignition temperature of the potentially explosive atmosphere where it will be installed. Define the ignition temperature of a substance. 2 ranges from 527 to 558 Kelvin, and Diesel fuel No .4 is 536 Kelvin. 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. All types of questions are solved for all topics. This shows that ignition temperature of kerosene oil is lower than that of wood. Students can solve NCERT Class 8 Science Combustion and Flame MCQs Pdf with Answers to know their preparation […] Ignition temperature: The minimum temperature at which combustion starts in a substance is called ignition temperature of that substance. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. petrol, alcohol, etc. Inflammable substances have very low ignition temperature. Lets we the following activity which shows that a substance cannot bum until it reaches its ignition temperature. Attainment […] Q11: Different substances catch fire at different _____ View Answer. Access Lakhmir Singh Science Class 8 Solutions For Chapter 6 Very Short Answer Type Questions. 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. Chapter 6. Iron nail b. 4. Also, he took four fuels W, X, Y, and Z. d. high ignition temperature and low calorific value. Answer: Ignition temperature is the minimum temperature at which combustion starts in a substance. When using electrical equipment in classified areas, such as lighting fixtures in Class I, Div. Q12: Can a matchstick catch fire on its own on room temperature? Answer. I. ... thank you madam I am of 8 th class it helped me lot. ... Q10: What is ignition temperature? Ans: The conditions under which combustion occurs are: (i) Presence of a combustible substance. Then, he started heating the water in beakers I, … For example, a log of wood has higher ignition temperature than cut pieces of wood. 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 . Unlike with flash points, the ignition temperature does not need an ignition source. ... 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). petrol, alcohol, etc. Good fuels have a. low ignition temperature and high calorific value. List conditions under which combustion can take place. c. high ignition temperature and high calorific value. Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT. Question 1. Booster 2. Water is commonly used to control fires. Transportation regulations distinguish fuels as either flammable or combustible depending upon their flashpoint. Flammable fuels have a flashpoint below 38°C 100.4 °F 311.15 K Fire can be controlled by removing one or more requirements essential for producing fire. Combustion and Flame Class 8 Science Chapter 6 as per NCERT Book used in CBSE and other Schools. Question 5: What is an inflammable substance? What are the Conditions Necessary for Combustion Conditions Necessary for Combustion The following conditions are necessary for combustion to take place. 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 The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature of a substance. Water is a very good fire extinguisher as it cools down the fuels such as wood below its ignition temperature. ... Ignition temperature – For catching fire, a combustible substance must reach its ignition temperature. 8 Which one of the following is combustible? 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