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Why does candle give flame when it is bu...

Why does candle give flame when it is burnt but why does coal burn without emitting a flame?

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NCERT TELUGU-COMBUSTION: FUELS AND FLAME-EXERCISE
  1. It is hard to ignite match stick in rainy days. Why?

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

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

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

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  5. What do we need to burn a material?

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

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  7. What will you prove by this experiment?

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

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

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

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

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

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  13. What makes match sticks to catch fire?

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

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

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  16. What is calorific value? Write its units

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

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

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  19. How does water help in eliminating the factors, which support the comb...

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  20. What is combustion ?

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