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It is difficult to burn a heap of green ...

It is difficult to burn a heap of green leaves but not a heap of dry leaves.Explain Why?

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VGS PUBLICATION-BRILLIANT-COMBUSTION , FUELS AND FLAME-EXERCISE
  1. What precautions are to be taken while pouring water on fire?

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  2. Give an example of a good fuel. How do you choose that fuel? Explain.

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  3. It is difficult to burn a heap of green leaves but not a heap of dry l...

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  4. Where do you find spontaneous combustion and rapid combustion in your ...

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  5. Why do we keep phosphorus in water?

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  6. How do you feel about "Fuels have become a part of human life"?

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  7. Is there any other procedure to prove that oxygen is needed for burnin...

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  8. The gas needed for combustion among the following is

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  9. The lowest temperature at which a substance catches fire is called its

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  10. The unit of calorific value

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  11. Spirit and petroleum turns into gas at

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  12. The type of combustion in which material suddenly burns into flames wi...

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  13. Why does candle give flame when it is burnt but why does coal burn wit...

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  14. Do all fuels produce same amount of heat when they are burnt?

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  15. What do we need to burn a material?

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  16. Have you observed material used to make school bell or bells in temple...

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  17. Name the three meninges. In which group of animals do you find all of ...

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  18. What do we need to burn a material?

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  19. Can we burn a material in the absence of air?

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  20. Why does a scented stick with burning stub does not catch fire when it...

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