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6. Combustion And Flame Science class 8 in English Medium ncert book solutions Additional Questions With Solutions
6. Combustion And Flame Additional Questions With Solutions – 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 Additional Questions With Solutions to help you master concepts and score higher.
6. Combustion And Flame Science class 8 in English Medium ncert book solutions Additional Questions With Solutions
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 Additional Questions With Solutions, 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 Additional Questions With Solutions. 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
Additional Questions With Solutions
Combustion And Flame:
Ques: What is combustion?
Ans: The chemical process in which a substance reacts with oxygen and gives heat is called combustion.
Ques: What is fuel?
Ans: The substance that undergoes combustion is said to be combustible. It is also called a fuel.
Ques: Name the reaction by which heat and light are produced in the sun.
Ans: Nuclear reaction.
Ques: What is ignition temperature?
Ans: The lowest temperature at which a substance catches fire is called its ignition temperature.
Ques: Why does the paper cup not burn while boiling water?
Ans: The heat supplied to the paper cup is transferred to water by conduction. So, in the presence of water, the ignition temperature of paper is not reached. Hence, it does not burn.
Ques: Write three essential requirements for producing fire.
Ans:
(i) Inflammable substance - fuels.
(ii) Ignition temperature
(iii) Oxygen
Ques: Which extinguisher is used to control the fire involving electric equipment and inflammable material like petrol?
Ans: CO2
Ques: How can fire be controlled suddenly?
Ans: The contact between fuel and oxygen is cut off to control the fire. For this, there are many processes like watering, use of CO2 . It also brings down the ignition temperature.
Ques: What is the advantages of use CO2 to control the fire.
Ans: CO2 does not harm the electric equipment while watering causes electric conduction.
Ques: Explain how CO2 is able to control fires?
Ans: CO2 being heavier than oxygen, covers the fire like blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.
Ques: Write the types of combustion.
Ans: There are three types of combustion
(i) Rapid combustion
(ii) Spontaneous combustion.
(iii) Explosion.
Ques: The candle gives flame during burning but charcoal does do so. Why?
Ans: The substances which vaporize during burning, gives flames. The candle is vaporised but the charcoal is not vaporised.
Ques: What are the various zone of flame?
Ans: The various zone of flame:
(i) Dark zone
(ii) Luminous zone
(iii) Non – luminous zone
Ques: Which zone of a flame does a goldsmith use for melting gold and silver and why?
Ans: The goldsmith uses dark zone. Since it is the hottest part of flame.
Ques: What do you mean by calorif value? Write its units.
Ans: The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. Its unit is kilojoules per kg (kj/kg)
Ques: What is the main cause of global warming?
Ans: CO2
Ques:Which poisonous gas are given by incomplete combustion of fuels?
Ans: Carbon monoxide.
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