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Have you observed material used to make ...

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

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VGS PUBLICATION-BRILLIANT-COMBUSTION , FUELS AND FLAME-EXERCISE
  1. Do all fuels produce same amount of heat when they are burnt?

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  2. What do we need to burn a material?

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

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

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  5. What do we need to burn a material?

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

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

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

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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 makes match sticks to catch fire?

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  13. What is calorific value? Write its units

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

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

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

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  17. Why do some materials burn and some do not?

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  18. Why do some materials which do nt burn at normal temperature burn at h...

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  19. If you lift the glass tumbler (which is placed over a burning candle) ...

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  20. How do you say that the gas released in the experiment is oxygen?

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