Download a PDF of free latest Sample questions with solutions for Class 8, Science, CBSE- Combustion and Flame . Ans: The conditions under which combustion occurs are: (i) Presence of a combustible substance. 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). 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 Students can solve NCERT Class 8 Science Combustion and Flame MCQs Pdf with Answers to know their preparation […] 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. Presence of a supporter of combustion: Adequate supply of a supporter of combustion (e.g., oxygen) is essential for combustion. Fuels. Water is commonly used to control fires. 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. c. high ignition temperature and high calorific value. CBSE Class 8 Science, CBSE- Combustion and Flame. petrol, alcohol, etc. Eileen Tang -- 2005 prefaces Class 8 Science Solved Q&A. Class 8 Science Solved Q&A. ... Ignition temperature is the lowest temperature at which a substance catches fire. Class 8 Chemistry Combustion and Flame: Ignition temperature: Ignition temperature. Boiling point b. Melting point c. Ignition temperature d. Critical temperature Ans.9(c) 10. Science MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Lets we the following activity which shows that a substance cannot bum until it reaches its ignition temperature. State the conditions under which combustion occurs. Previous Johny Johny Yes Papa | Nursery Rhymes & Kids Songs. 2. Among the given options coal Answer. List conditions under which combustion can take place. The lowest temperature at which a Substance catches fire is called its-a. Q12: Can a matchstick catch fire on its own on room temperature? Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT. Wood b. All types of questions are solved for all topics. View Answer. 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)]. 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 . 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.. Q11: Different substances catch fire at different _____ View Answer. A substance which reacts with oxygen giving heat is called a combustible substance. The lesson covers the complete explanation of class 8 Chapter 6 Combustion and Flame.Topics covered are combustion, flame and fuels. More... #include a. Chapter 6. NCERT Exemplar Solutions for Class 8 Science Chapter 6 Combustion and Flame is provided here in PDF format. A class that stores temperature information, and allows conversion between different units. Answer: Combustion can take place in the presence of: (a) a combustible substance. Question 2. 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. 2 ranges from 527 to 558 Kelvin, and Diesel fuel No .4 is 536 Kelvin. Question 1. (ii) Presence of O2 (supporter of combustion) (iii) Heating to its ignition temperature. Definition. Ignition temperature is the lowest temperature at which a combustible substance catches fire. 8 Which one of the following is combustible? 2. Iron nail b. Science In Everyday Life Solutions for Class 8 Science Chapter 5 Combustion And Fossil Fuels are provided here with simple step-by-step explanations. We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. The flash point of a volatile liquid is the lowest temperature at which it can vaporise to form an ignitable mixture in air. You can also get complete NCERT solutions and Sample papers. EDUCATION YouTube Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT By admin 8 mins ago . Flammable fuels have a flashpoint below 38°C 100.4 °F 311.15 K 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. What are the Conditions Necessary for Combustion Conditions Necessary for Combustion The following conditions are necessary for combustion to take place. I. Answer: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. ... thank you madam I am of 8 th class it helped me lot. For example, a log of wood has higher ignition temperature than cut pieces of wood. Inflammable Substance: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. ... Q10: What is ignition temperature? Solution: Ignition temperature is the lowest temperature at which a substance catches fire. Define the ignition temperature of a substance. View Answer. Inflammable substances have very low ignition temperature. In this chapter, the students will learn about combustion, types of combustion, flames, the structure of a flame. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Which of the following has lower ignition temperature? II. When using electrical equipment in classified areas, such as lighting fixtures in Class I, Div. 5. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. d. high ignition temperature and low calorific value. With an increase in pressure the autoignition temperature … Ignition Temperature. 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