Page 45 - Genius Kidz Prudence Learning Sc-8

4. Mark the statements as True /False .

(a) Fire extinguisher extinguishes fire.
(b) Dark zone is the outermost zone of a flame.
(c) A good fuel is the one which is costly.

(d) Lower is the ignition temperature better is the fuel.

5. Except candle, which other thing burns with a flame, discuss its working.

6. Certain electronic equipments at our home are said to release green house gases. Which
equipments are these and why do they release gases.

7. Very short answer type questions.
(a) What is a solid fuel?
(b) What is a processed fuel?

(c) What is a flame?
(d) What is explosion?

8. Short answer type questions.
(a) Discuss three types of combustion.

(b) What are combustible and non-combustible substances?
(c) How does carbon dioxide extinguish a fire?

(d) What do you mean by calorific value of a fuel?
9. Long answer type questions.

(a) What is combustion? Discuss the parameter essential for combustion to take place. Also discuss its
types and products.
(b) What is fire extinguisher? Describe its design and working.

(c) What is a flame? Discuss its zones.
(d) What is a good fuel? Discuss its types and efficiency.
(e) Discuss the impact of burning of fuels on air.

45