NCERT Solutions Class 8 Science Chapter 6 Combustion and Flame – Here are all the NCERT solutions for Class 8 Science Chapter 6. This solution contains questions, answers, images, explanations of the complete chapter 6 titled Combustion and Flame From of Science taught in class 8. If you are a student of class 8 who is using NCERT Textbook to study Science, then you must come across chapter 6 Combustion and Flame . After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 8 Science Chapter 6 Combustion and Flame in one place.
NCERT Solutions Class 8 Science Chapter 6 Combustion And Flame
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Combustion And Flame
NCERT Solutions Class 8 Science chapter 6 Combustion And Flame
Class 8, Science chapter 6, Combustion And Flame solutions are given below in PDF format. You can view them online or download PDF file for future use.
Combustion And Flame
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Question & Answer
Q.1: List conditions under which combustion can take place.
Ans : Combustion is a process of reaction of a substance with oxygen. There are certain conditions required for combustion to take place. They are: (i) Presence of a fuel (ii) Air (or oxygen) (iii) Ignition temperature (minimum temperature at which a substance catches fire)
Q.2: Fill in the blanks. (a) Burning of wood and coal causes ________ of air. (b) A liquid fuel, used in homes is ________ . (c) Fuel must be heated to its _______,_________ before it starts burning. (d) Fire produced by oil cannot be controlled by _________ .
Ans : (a) Burning of wood and coal causes pollution of air. (b) A liquid fuel used in homes is liquefied petroleum gas (LPG) . (c) Fuel must be heated to its ignition temperature before it starts burning. (d) Fire produced by oil cannot be controlled by water
Q.3: Explain how the use of CNG in automobiles has reduced pollution in our cities
Ans : Combustion of fuels like petroleum causes formation of unburnt carbon particles along with carbon monoxide gas. These harmful pollutants enter the air and cause respiratory diseases. Compressed Natural Gas (CNG) produces these harmful products in very less quantity. It is a comparatively cleaner fuel. Therefore, the use of CNG has reduced pollution in our cities.
Q.4: Compare LPG and wood as fuels.
Ans : Wood has been a traditional fuel for both domestic and industrial use. However, it produces a lot of smoke that can cause respiratory problems. Also, wood is obtained from trees. Thus, using wood as a fuel causes deforestation. Therefore, slowly wood is replaced by LPG, which is a liquefied form of petroleum gas. It does not give out smoke and other pollutants and is a cleaner fuel. Again, fuel efficiency of LPG is more than that of wood. The calorific value of LPG is 55000 kJ /kg, while that of wood is between 17000 to 22000 kJ / kg. Hence, LPG is favoured over wood.
Q.5: Give reasons. (a) Water is not used to control fires involving electrical equipment. (b) LPG is a better domestic fuel than wood. (c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
Ans : (a) Water is a good conductor of electricity. If it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock. Also, water can damage electrical equipments. (b) LPG is a better domestic fuel as it does not produce smoke and unburnt carbon particles, which cause respiratory problems. (c) A piece of paper wrapped around aluminium pipe does not catch fire easily. This is because aluminium, being a metal, is a good conductor of heat. Therefore, heat is transferred from the paper to the metal and the paper does not attain its ignition temperature.
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