Air Model Question Paper

6th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. ____________ is the percentage of nitrogen in air.

    (a)

    78%

    (b)

    21%

    (c)

    0.03%

    (d)

    1%

  2. Gas exchange takes place in plants using __________

    (a)

    Stomata

    (b)

    Chlorophyll

    (c)

    Leaves

    (d)

    Flowers

  3. The constituent of air that supports combustion is _________________

    (a)

    Nitrogen

    (b)

    carbon-di-oxide

    (c)

    Oxygen

    (d)

    water vapour

  4. Nitrogen is used in the food packaging industry because it ________________

    (a)

    provides colour to the food

    (b)

    provides oxygen to the food

    (c)

    adds proteins and minerals to the food

    (d)

    keeps the food fresh

  5. ______________ and ________________ are the two gases, which when taken together, make up about 99 percentage of air.
    I.Nitrogen
    II. carbon-di-oxide
    III. Noble gases
    IV. Oxygen

    (a)

    I and II

    (b)

    I and III

    (c)

    II and IV

    (d)

    I and IV

  6. 4 x 1 = 4
  7. __________ is the active component of air.

    ()

    Oxygen

  8. The gas given out during photosynthesis is _________.

    ()

    Oxygen

  9. __________ gas is given to the patients having breathing problems.

    ()

    Oxygen

  10. __________ can be seen moving in a beam of sunlight in a dark room.

    ()

    Dust particles

  11. 5 x 2 = 10

  12. What will happen if we remove plants from the aquarium?

  13. What is atmosphere? Name the five layers of atmosphere

  14. How do the roots of land plants get oxygen for breathing?

  15. What should be done if the clothes of a person catch fire accidentally? Why?

  16. What will happen if you breathe through mouth?

  17. 2 x 3 = 6
  18. Biscuits kept open on a plate during monsoon days lose its’ crispness. Why?

  19. Why do traffic assistants wear a mask on duty?

  20. 3 x 5 = 15
  21. How do plants and animals maintain the balance of oxygen and carbon-dioxide in air?

  22. Why is atmosphere essential for life on earth?

  23. Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off fire?

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