Term 2 Air Model Question Paper

8th Standard EM

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  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. Carbon dioxide with water changes

    (a)

    blue litmus to red

    (b)

    red litmus to blue

    (c)

    blue litmus to yellow

    (d)

    doesn’t react with litmus

  5. Which of the following is known as azote?

    (a)

    Oxygen

    (b)

    Nitrogen

    (c)

    Sulpher

    (d)

    Carbon dioxide

  6. 4 x 2 = 8
  7. What are the sources of oxygen?.

  8. Mention the physical properties of oxygen.

  9. What is global warming?

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

  11. 4 x 3 = 12
  12. What happens when carbon dioxide is passed through lime water? Write the equation for this reaction.

  13. Name the compounds produced when the following substances burn in oxygen.
    a) Carbon
    b) Sulphur
    c) Phosphorous
    d) Magnesium
    e) Iron
    f) Sodium

  14. How does carbon dioxide react with the following?
    a) Potassium
    b) Lime water
    c) Sodium hydroxide

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

  16. 1 x 5 = 5
  17. It is said that sleeping beneath the tree during night is bad for health. What is the reason?

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