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Why do fire brigades pour water on the f...

Why do fire brigades pour water on the fire?

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Water cools the combustible material so that its temperature get below its ignition temperature. This prevents fire from spreading.
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  1. Why do fire brigades pour water on the fire?

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  2. What is the cause of suspended particulate matter in the atmosphere?

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  3. What is the characteristic of an ideal fuel?

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  4. What is the SI unit of calorific value?

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  5. Which of these is a solid fuel?

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  6. Dark zone is also called zone of .

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  7. In which zone of a candle flame : complete combustion of fuel takes pl...

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  8. What changes the colours of the flame of a candle?

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  9. When does a substance produce flame during combustion?

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  10. What is an identifying feature of a carbon dioxide fire extinguisher?

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  11. Which two chemicals react in a soda-acid fire extinguisher?

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  12. Why is the use of water avoided to extinguisher electrical fires?

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  13. How can we extinguish a fire?

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  14. Which of these is an example of incomplete combustion?

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  15. In which reaction a combustible substance reacts with oxygen to give c...

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  16. Why is sodium metal kept under kerosene oil ?

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  17. Which of these is an example of rapid combustion?

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  18. Which of the following is a supporter of combustion?

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  19. Which of these is an inflammable substance?

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  20. Which of these is an example of a non-combustible substance?

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  21. What type of change is combustion?

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