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It is hard to ignite match stick in rain...

It is hard to ignite match stick in rainy days. Why?

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NCERT TELUGU-COMBUSTION: FUELS AND FLAME-EXERCISE
  1. Why do we keep phosphorus in water?

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  2. Why do kerosene stoves and bunsen burners have small holes in them?

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  3. It is hard to ignite match stick in rainy days. Why?

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  4. A wax candle burns with a yellow flame. The domestic gas burns when li...

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

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

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  7. What do we need to burn a material?

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  8. When you burn a piece of wood different changes take place. Analyse th...

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  9. What will you prove by this experiment?

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

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  11. A slow fire bursts into a flame when air is blown on it, but a candle ...

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  12. If a large quantity of dry grass is set on fire in forests then it is ...

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  13. When an object catches fire, the fire is put off by covering with sand...

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  14. What could be the reason for this variation in burning patterns among ...

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  15. What makes match sticks to catch fire?

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  16. Can you decide the best fuel among the solids, liquids and gases?

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  17. What is the criteria to decide a best fuel ?

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  18. What is calorific value? Write its units

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  19. How can we put off the fire if it breaks out?

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  20. Why the fire brigade start the work by putting off the electric mains?

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