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Class 8 Science Chapter 6 Combustion And Flame Quiz 2 (25 MCQs)

Quiz Instructions

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1. Place a piece of burning charcoal on an iron plate and cover it with a plastic jar. The charcoal stops burning because
2. What happens in the dark zone of the candle??
3. CNG and LPG are the examples of
4. What is combustion
5. Which gas is produced during the combustion of hydrocarbons?
6. Calculate the theoretical weight and volume of air at NTP, required for the complete combustion of 1 kg of coke
7. Which one of the following is fuel of our body?
8. Larger and irregular lumps of solid fuel (e.g. coal) when fired in a boiler or furnace may lead to
9. Name the type of combustion caused when a cracker is ignited.
10. The central zone of candle flame is luminous due to
11. Ignition temperature is
12. The minimum temperature at which a material ignites is called
13. The three essential requirements for the production of fire are ..... , ..... , and .....
14. Which of the following can be used to generate electricity
15. Is wood a inflammable substance??
16. Combustible substances are also known as
17. ..... burns rapidly at room temperature.
18. Global warming is caused due to ..... concentration of CO2 in air
19. Spontaneous combustion occurs in case of
20. What is essential for combustion?
21. Fire extinguisher-
22. The calorific value of a fuel is expressed in a unit called ..... (kJ / kg).
23. Carbon dioxide as fire extinguisher not only forms a blanket around the fire, it also brings down the temperature of the fuel.
24. Which substance give heat and light after combustion?
25. I am an excellent fire extinguisher. I can be stored at high pressure as a liquid in cylinders. Who am I?
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