Inflammable substances have very low ignition temperature. 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. 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. Science In Everyday Life Solutions for Class 8 Science Chapter 5 Combustion And Fossil Fuels are provided here with simple step-by-step explanations. 2 ranges from 527 to 558 Kelvin, and Diesel fuel No .4 is 536 Kelvin. 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 . State the conditions under which combustion occurs. 2. Answer: (B) Then, he started heating the water in beakers I, … Answer: Combustion can take place in the presence of: (a) a combustible substance. Eileen Tang -- 2005 prefaces We have provided Combustion and Flame Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Glass c. Stone pieces d. Paper Ans.8. Answer: Ignition temperature is the minimum temperature at which combustion starts in a substance. Ignition temperature: The minimum temperature at which combustion starts in a substance is called ignition temperature of that substance. All types of questions are solved for all topics. In this chapter, the students will learn about combustion, types of combustion, flames, the structure of a flame. Which of the following has lower ignition temperature? List conditions under which combustion can take place. Free PDF Download of CBSE Science Multiple Choice Questions for Class 8 with Answers Chapter 6 Combustion and Flame. ... Ignition temperature – For catching fire, a combustible substance must reach its ignition temperature. Class 8 - Science - Combustion and Flame (Q & A) COMBUSTION AND FLAME (Questions and Answers) Q1. Answer. Good fuels have a. low ignition temperature and high calorific value. A substance which reacts with oxygen giving heat is called a combustible substance. 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. Heat | Ignition Temperature | Combustion and Flame Class 8 Science | CBSE | NCERT. Define the ignition temperature of a substance. View Answer. 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. ... Ignition temperature is the lowest temperature at which a substance catches fire. With an increase in pressure the autoignition temperature … 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 (d) 9. 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.. 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. Ignition Temperature. Class 8 Chemistry Combustion and Flame: Ignition temperature: Ignition temperature. Solution: Ignition temperature is the lowest temperature at which a substance catches fire. Wood b. You can also get complete NCERT solutions and Sample papers. 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. Answer: A substance which has very low ignition temperature so that is can easily catch fire is called an inflammable substance, e.g. petrol, alcohol, etc. The lowest temperature at which a Substance catches fire is called its-a. Lets we the following activity which shows that a substance cannot bum until it reaches its ignition temperature. ... Q10: What is ignition temperature? 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 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. Access Lakhmir Singh Science Class 8 Solutions For Chapter 6 Very Short Answer Type Questions. Question 1. Also, he took four fuels W, X, Y, and Z. 4. Water is a very good fire extinguisher as it cools down the fuels such as wood below its ignition temperature. NCERT Exemplar Solutions for Class 8 Science Chapter 6 Combustion and Flame is provided here in PDF format. View Answer. Class 8 Science Solved Q&A. 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)]. Continue Reading. Transportation regulations distinguish fuels as either flammable or combustible depending upon their flashpoint. 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. Flammable fuels have a flashpoint below 38°C 100.4 °F 311.15 K Sujit took four different beakers I, II, III, and IV each containing 1 litre water. Water is commonly used to control fires. The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature of a substance. Combustion and Flame Class 8 Science NCERT Textbook Questions. This shows that ignition temperature of kerosene oil is lower than that of wood. (ii) Presence of O2 (supporter of combustion) (iii) Heating to its ignition temperature. Booster 2. (c) attainment of ignition temperature of the substance. Fire can be controlled by removing one or more requirements essential for producing fire. Fuels. 5. d. high ignition temperature and low calorific value. b. low ignition temperature and low calorific value. It is also used to characterize the fire hazards of fuels. What are the Conditions Necessary for Combustion Conditions Necessary for Combustion The following conditions are necessary for combustion to take place. For example, a log of wood has higher ignition temperature than cut pieces of wood. Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. Attainment […] More... #include
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