Air Model Question Paper

8th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    4 x 1 = 4
  1. Which of the following is true about oxygen?

    (a)

    Completely burning gas

    (b)

    Partially burning gas

    (c)

    Doesn’t support burning

    (d)

    Supports burning

  2. Aerated water contains

    (a)

    air

    (b)

    oxygen

    (c)

    carbon dioxide

    (d)

    nitrogen

  3. Solvay process is a method to manufacture

    (a)

    lime water

    (b)

    aerated water

    (c)

    distilled water

    (d)

    sodium carbonate

  4. Which of the following is known as azote?

    (a)

    Oxygen

    (b)

    Nitrogen

    (c)

    Sulpher

    (d)

    Carbon dioxide

  5. 3 x 1 = 3
  6. ___________ is called as vital life

    ()

      

  7. Nitrogen is ___________ than air.

    ()

      

  8. Dry ice is used as a ___________.

    ()

      

  9. 4 x 1 = 4
  10. Nitrogen

  11. (1)

    Refrigerator

  12. Oxygen

  13. (2)

    Fertilizer

  14. Carbon dioxide

  15. (3)

    Respiration in living animals

  16. Dry ice

  17. (4)

    Fire extinguisher

    4 x 2 = 8
  18. What are the sources of oxygen?.

  19. List out the uses of nitrogen

  20. What is global warming?

  21. What is dry ice? What are its uses?

  22. 2 x 3 = 6
  23. Name the compounds produced when the following substances burn in oxygen.
    a) Carbon
    b) Sulphur
    c) Phosphorous
    d) Magnesium
    e) Iron
    f) Sodium

  24. What are the effects of acid rain? How can we prevent them?

  25. 3 x 5 = 15
  26. Soda bottle bursts sometimes when it is opened during summer. Why?

  27. Why does the fish die when it is taken out of water

  28. How do astronauts breathe when they go beyond earth’s atmosphere?

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