Changes Around Us Book Back Questions

6th Standard

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. Drying of wet clothes in air is an example of

    (a)

    Chemical change

    (b)

    Undesirable change

    (c)

    irreversible change

    (d)

    physical change

  2. Formation of curd from milk is

    (a)

    a reversible change

    (b)

    a fast change

    (c)

    an irreversible change

    (d)

    an undesirable change

  3. Air pollution leading to Acid rain is a

    (a)

    reversible change

    (b)

    fast change

    (c)

    natural change

    (d)

    human made change

  4. 3 x 1 = 3
  5. Changes that are harmful to us are_______________(desirable / undesirable)

    ()

    undesirable

  6. Plants convert Carbon-di-oxide and water into starch. This is an example of _____________change. (natural / human made)

    ()

    natural

  7. Bursting of fire crackers is a ___________________change whereas germination of seeds is a _________________change. (slow / fast)

    ()

    slow

  8. 3 x 1 = 3
  9. Change of New moon to Full moon is human made.

    (a) True
    (b) False
  10. Digestion of food is a physical change.

    (a) True
    (b) False
  11. In a solution of salt in water, water is the solute.

    (a) True
    (b) False
  12. 2 x 2 = 4
  13. Cooking of food : desirable change :: decaying of food : _________change

  14. Burning of matchstick :_______ change: Rotation of the Earth : Slow change

  15. 3 x 2 = 6
  16. You are given some candle wax. Can you make a candle doll from it? What kind of change is this?

  17. What happens when cane sugar is strongly heated? Mention any two changes in it.

  18. What is a solution?

  19. 2 x 3 = 6
  20. What happen when paper is burnt? Explain.

  21. What type of changes is associated with germination of a seed? Explain

  22. 1 x 5 = 5
  23. When a candle is lit the following changes are observed.
    a. Wax melts.
    b. Candle keeps burning.
    c. The size of the candle decreases.
    d. The molten wax solidifies
    e. Which of the changes can be reversed? Justify your answer.

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