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True or false .If False , give the corre...

True or false .If False , give the correct statement: The composition of air is always exactly the same.

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SURA PUBLICATION-AIR -Exercise
  1. True or false .If False , give the correct statement: The composition...

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  2. The constituent of air that supports combustion is .

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  3. is the percentage of nitrogen in air

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  4. respire using their skin.

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  5. was able to identify hightly reactive gas called oxygen.

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  6. The oxone layer protects all life on earth from the harmfullrays of th...

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  7. is used in trucks or freight cars for refrigerating perishable items s...

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  8. Name some extra – ordinary conditions where oxygen is used.

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  9. Find whether the following sentence are true or false.If false correc...

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  10. What is a weathercock?

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  11. Explain about respiration of plants and animals in water.

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  12. Take a few ice cubes in a glass. Keep it on the table for a few minute...

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  13. Biscuits kept open on a plate during monsoon days lose its'crispness.W...

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  14. Analogy: Photosynthesis ::: Respiration : Oxygen.

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  15. Who is Jan Ingenhousz?

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  16. Analogy.</br> Industrial cites: :: Windy places: dust particles.

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  17. Why aircraft usually fly above the troposphere layer?

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  18. Write the composition of gases in atmosphere.

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  19. What is dry ice? What is its use?

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  20. Write the word equation for respiration process.

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  21. Why is atmosphere essential for life on earth?

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