Combustion is a chemical reaction in which matter reacts in the presence of oxygen to release heat. The substance that burns in the presence of oxygen is classified as a combustible material. It is also known as fuel. CNG, LPG and coal are some examples of flammable materials. If the light is observed during combustion, it is referred to as a flame.
Download Class 8 Chemistry Worksheet on Chapter 6 Combustion and Flame Set 3 PDF
CBSE Class 8 Chemistry Chapter 6 Combustion and Flame Worksheet – Set 3
Q1. CNG is the abbreviation of
(a) Compressed natural gas
(b) Compress natural gas
(c ) Both (a), and (b)
(d) None of the above
Q2. Which of the following is used as a fire extinguisher?
(a) Water
(b) Carbon dioxide
(c ) Both (a) and (b)
(d) None of the above
Q3. Which of the following is an example of a flammable substance?
(a) CNG
(b) LPG
(c ) Both (a) and (b)
(d) None of the above
Q4. Which zone of the candle represents complete combustion?
(a) Inner zone
(b) Middle zone
(c ) Outer zone
(d) None of the above
Q5. The minimum temperature at which a combustible material catches fire is known as
(a) Latent temperature
(b) Lowest degree temperature
(c ) Ignition temperature
(d) None of the above
Q6. Name a combustible and non-combustible material.
Q7. What is combustible and non-combustible material?
Q8. What is the significance of food for our bodies?
Q9. What will happen if magnesium is burned in the air?
Q10. What will happen if the air is cut off during the combustion process?
Q11. Name the temperature at which the substance starts burning and catching fire?
Q12. Why is water not used to extinguish petrol and oil fires?
Q13. Can we use a blanket to extinguish the fire? If yes, then justify your answer.
Q14. What is spontaneous combustion? Give an example.
Q15. (a) Does a fuel exist in a gaseous state? If yes, name them.
(b) What is the unit of calorific value?
Q16. What is the importance of using CNG in vehicles?
Q17. What is calorific value?
Q18. What are the conditions required for the combustion?
Q19. How will you differentiate a luminous flame from a non-luminous flame?
Q20. (a) What will happen if the oxygen supply is not sufficient?
(b) What is the colour of the LPG stove? Give a reason for your answer.
(c ) Which zone of candle contains unburnt wax vapours?
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Read Also:
- Combustion and Flames
- Chemistry Concept Questions and Answers
- Class 8 Chemistry Chapter 6 – Combustion and Flame Important Questions with Answers
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