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6. Combustion And Flame Science class 8 in English Medium ncert book solutions Text Book Exercise
6. Combustion And Flame Text Book Exercise – Complete NCERT Book Solutions for Class 8 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 6. Combustion And Flame Text Book Exercise to help you master concepts and score higher.
6. Combustion And Flame Science class 8 in English Medium ncert book solutions Text Book Exercise
NCERT Solutions for Class 8 Science play an important role in helping students understand the concepts of the chapter 6. Combustion And Flame clearly. This chapter includes the topic Text Book Exercise , which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 8 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 6. Combustion And Flame is explained in a structured way, making it easier for students to connect the theory with the topic Text Book Exercise . By studying these updated NCERT Solutions for Class 8 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
6. Combustion And Flame
Text Book Exercise
Text Book Exercise:
Q6. Make a labelled diagram of a candle flame.
Answer : Fig. 6.1 A candle flame
Q7. Name the unit in which the calorific value of a fuel is expressed.
Answer : The calorific value of a fuel is expressed in kilojoules per kg (kJ/kg).
Q8. Explain how CO2 is able to control .
Answer : CO2 being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled. The added advantage of CO2 is that in most cases it does not harm the electrical equipment.
Q9. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
Answer : Green leaves contain lot of water. So, when we try to burn green leaves, water contained in the leaves cools the combustible materials (leavss), so thaqt its temperature is brought below its ignition temperture. This prevents the burning of green leaves. In case of dry leaves, they do not contain any water. So when buring process starts, its temperature is raised drastically above its ignition temperature and the leaves catch fire easily.
Q10. Which zone of a flame does a goldsmith use for melting gold and silver and why?
Answer : The goldsmith uses the outermost zone of a flame with a metallic blow-pipe for melting gold and silver. The flame in the outermost zone has the highest temperature sufficient to melt the gold and silver.
Q11. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
Answer : Calorific value of fuels
= kilojoules/kg = (Total heat produced/Total mass burent)
Here, the mass of fuel =4.5 kg
The heat produced =180,000 kJ.
Calorific value of fuel =180,000 kJ/ 4.5 kg
= 40,000 kJ per kg.
Q12. Can the process of rusting be called combustion? Discuss.
Answer : Yes, process of rusting can be called combution, in fact, slow combution, because rusting also takes place in the air (O2) in presence of humidity in the atmosphere.
Q13. 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 outermost part of the flame. Whose water will get heated in a shorter time?
Answer : The water of Ramesh,s beaker will get heated with a shorter time because the outermost part of the flame the hottest.
See other sub-topics of this chapter:
1. Chapter Review 2. Text Book Exercise 3. Text Book Exercise 4. Additional Questions With Solutions 5. Additional Questions With Solutions