Study MaterialsNCERT SolutionsNCERT Solutions for Class 8 ScienceNcert Class 8 Science Chapter 6 Combustion and Flame

Ncert Class 8 Science Chapter 6 Combustion and Flame

Class 8 Science Chapter 6 NCERT Solutions – Free PDF Download

Class 8 Science Chapter 6 NCERT Solutions One of the most significant parts of study for science students is combustion and flame. The ignition and fire arrangements provided here might assist understudies in intuitively setting up the subjects. Understudies in Class 8 are also urged to read the NCERT course readings and answer the questions to gain a better understanding of the themes and subtopics. Check the arrangements provided to quickly answer any inquiries. This NCERT Solution provides solutions to questions about burning, types of burnings, the role of oxygen in burning, start temperature, flammable substances, fire control, definition and various zones of fire, hazardous contaminations, corrosive downpour, and its effects.

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    COMBUSTION AND FLAME

    Combustion and flame

    1. List the conditions under which combustion can take place?
    2. Conditions necessary for combustion are:
    3. i) Presence of combustible substance.
    4. ii) Attaining ignition temperature.

    iii) Proper supply of air to provide oxygen.

    1. Fill in the blanks
    2. a) Burning of wood and coal, causes ___________ of air.
    3. b) A liquid fuel, used in homes is ___________
    4. c) Fuel must be heated to its ___________ before it starts burning.
    5. d) Fire produced by oil cannot be controlled by ___________
    6. a) Pollution b) Kerosene
    7. c) Ignition temperature d) water

    1. Explain how the use of CNG in automobiles has reduced pollution in our cities?
    2. The use of CNG in automobiles has reduced pollution in our cities by the following ways:
    3. i) CNG produces less carbon monoxide gas
    4. ii) CNG produces less CO2 gas

    iii) CNG produces less amount of SO2 and NO2 (Nitrogen dioxide) which causes acid rain.

    1. iv) No residue remain after combustion
    2. Compare LPG and wood as fuels ?
    3. LPG Wood
    4. i) It is gaseous fuel i) It is solid fuel
    5. ii) It does not produce smoke ii) It produces smoke

    iii) Its calorific value is more iii) Its calorific value is in the range

    (nearly 55,000 kJ/Kg) between (17000 – 22000 kJ/kg)

    1. iv) It is easily stored in cylinders iv) It requires more space to store
    2. v) It does not cause any pollution v) It causes more pollution
    3. Give reasons for
    4. a) Water is not used to control fires involving electrical equipment?
    5. Water is a good conductor of electricity. It conducts electricity and may result electric shock.
    6. b) LPG is a better domestic fuel than wood why?
    7. LPG has more calorific value and it does not produce pollution. so it is better domestic fuel than wood.
    8. c) Paper catches fire by it self easily where as a piece of paper wrapped around an aluminium pipe does not?
    9. The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat so paper does not attain its ignition temperature.
    10. Make a labelled diagram of a candle flame

     

    1. Name the unit in which the calorific value of a fuel is expressed?
    2. Calorific value of a fuel is expressed in the units of kilojoule per kg.
    3. Explain how CO2is able to control fires?
    4. i) CO2 forms a blanket around fire due to which the supply of air is stopped.
    5. ii) CO2 also brings down the temperature of the fuel.

    1. It is difficult to burn a heap of green leaves but dry leaves catch fire easily explain ?
    2. The green leaves contain some water dew with which the ignition temperature of leaves increases and they donot catch fire, but dry leaves have no water, so they catch fire easily.
    3. Which zone of a flame does a gold smith use for melting gold and silver and why?
    4. A goldsmith uses the outer zone i.e non – luminous zone of candle flame to melt gold and silver because it is hottest zone and has more temperature.
    5. In an experiment 4.5kg of a fuel was completely burnt. The heat produced was measured to be 180,000kj. Calculate the calorific value of the fuel ?
    6. Given total mass of fuel = 4.5kg

    Total heat produced = 180,000 KJ

    Heat produced by burning 1kg of fuel

    = 180,000KJ/4.5kg

    = 40,000KJ/kg

    Calorific value of fuel = 40,000KJ/kg

    1. Can the process of rusting be called combustion? discuss.
    2. The process of rusting cannot be called combustion because in this process no heat and light is produced. Due to this reason Iron is not considered as combustible substance.
    3. Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outer most part of the flame. Whose water will get heated in a shorter time?
    4. The water heated by Ramesh will get heated in a shorter time because he kept his beaker near the non luminous flame.

     

     

     

    NCERT Solutions for Class 8: Combustion and Flame

    The free Class 8 Science Chapter 6 PDF download for NCERT solutions will assist you in learning Chemistry in more depth. The topics covered in NCERT answers for Chapter 6 Science Class 8 are an important component of the curriculum. NCERT Solutions give students a clear picture of the material and assist them in getting good grades in their exams. The NCERT answers for Class 8 Science Chapter 6 can be downloaded in PDF format from the NCERT website. It is simple to comprehend and will answer any questions that pupils may have.

    Class 8 Science Chapter 6 NCERT Solutions for Combustion and Flame

    NCERT Solutions for Class 8 Science Chapter 6 NCERT Solutions for Class 8 Science Chapter 6 NCERT Solutions for Class 8 Science Combustion and Flame gives a clear picture of how to deal with combustion using CNG instead of other fuels. CNG, on the other hand, is a cleaner fuel. CNG can be used in place of diesel, petroleum, or propane/LPG. It has a few of irritating gases in most of the components, in addition to the various energies mentioned previously. The combustion of fossil fuels such as oil produces a large number of unburned carbon particles as well as carbon monoxide, which causes respiratory illnesses.

    The following subjects are also covered in this PDF’s solutions. Water is a good power conduit. When water was added to an electrical fire, it just dispersed the electricity even further. An electric jolt could be applied to the person who drenches the flames. LPG is a cleaner fuel than wood because it does not produce smoke or other contaminants. Wood, on the other hand, emits a lot of smoke and exhaust, which pollutes the atmosphere, causes pollution, and causes respiratory problems.

    As a result, LPG outperforms wood as a homegrown fuel. Due to its low starting temperature, the paper bursts into flames without the help of anyone else. Because aluminium is a good conductor of power, a piece of paper folded over an aluminium pipe does not burst into flames. At the same time, the paper folded over an aluminium pipe causes the start temperature to rise. In this technique, warmth is transferred from paper to the user.

    NCERT Class 8 Science Chapter 6 Solution Weightage Point

    s in the CBSE examinations, Class 8 Science Chapter 6 Solution carries a total of 10 marks. The following are the subjects covered in NCERT Solutions for Class 8 Science Chapter 6:

    • Combustion.
    • Flame Reduction Techniques
    • Combustions come in a variety of shapes and sizes.
    • The Function of Oxygen in Combustion
    • Temperatures of Ignition.
    • Substances that are flammable.
    • Controlling the fire.
    • The Efficiency of Fuel.
    • Flame Definitions and Different Zones
    • Pollutants that are hazardous.
    • Acid Rain: Its Causes and Consequences

    NCERT Solutions for Class 8 Science Chapter 6 Perks Flame and Combustion

    NCERT Class 8 Science Chapter 6 has a plethora of advantages. The answers will dispel any uncertainties that candidates may have, and they will also address any future inquiries they may have about these issues. Flame and Combustion and Flame are clearly explained in Class 8 NCERT Solutions. These solutions are written in plain language that all pupils may understand. The answers are provided by teachers who are considered experts in this field. Certain are created with the sole purpose of assisting students in achieving the highest possible grade on these topics. The solutions also provide practical examples from Chapter 6 Science Class 8 so that students may tackle any topic in the subject without trouble. For the students’ benefit, all possible topics that may arise in the tests are thoroughly addressed in these solutions.

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