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Which zone of a flame does a goldsmith u...

Which zone of a flame does a goldsmith use for melting gold and silver metal why?

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VGS PUBLICATION-BRILLIANT-COMBUSTION , FUELS AND FLAME-EXERCISE
  1. Give four examples of non-combustible materials.

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  2. Why is water not suitable as fire extinguisher for fires involving oil...

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  3. Which zone of a flame does a goldsmith use for melting gold and silver...

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  4. Which type of substances give flame?

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  5. What would happen if oxygen stops to support combustion? Make a guess....

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  6. Let us assume that you are on the moon. If you try to focus sunlight o...

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  7. "Is combustion possible without the supply of oxygen? Discuss with you...

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  8. Water is not used to control fires involving electrical equipment.Why?

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  9. Give reasons. Paper by itself catches fire easily whereas a piece of p...

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  10. Explain how CO2 is able to control fires.

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  11. What are the three essential requirements for producing fire?

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  12. Why "CNG" being used as a fuel for vehicles?

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  13. Whether rusting is combustion reaction or not ? Why

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  14. List the ways adopted by fire fighters to combat fires.

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  15. Draw the diagram of candle flame and label all the zones.

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  16. Explain giving reasons: In which of the following situations water wil...

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  17. Explain giving reasons: In which of the following situations water wil...

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  18. In a few years the fuels on earth will be exhausted. Think, what would...

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  19. Spirit burns quickly like petrol but sodium metal and white phosphorou...

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  20. Why a wick is not used in gas burners?

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