Changes Around Us Model Question Paper

6th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 40
    4 x 1 = 4
  1. When ice melts to form water, change occurs in its

    (a)

    position

    (b)

    colour

    (c)

    state

    (d)

    composition

  2. Drying of wet clothes in air is an example of

    (a)

    Chemical change

    (b)

    Undesirable change

    (c)

    irreversible change

    (d)

    physical change

  3. Out of the following an example of a desirable change is

    (a)

    rusting

    (b)

    change of seasons

    (c)

    earthquake

    (d)

    flooding

  4. Air pollution leading to Acid rain is a

    (a)

    reversible change

    (b)

    fast change

    (c)

    natural change

    (d)

    human made change

  5. 4 x 1 = 4
  6. Magnet attracts iron needle. This is ________________change. (a reversible / an irreversible)

    ()

    an irreversible

  7. Boiling of egg results in__________________change. (a reversible / an irreversible)

    ()

    a reversible

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

    ()

    natural

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

    ()

    slow

  10. 5 x 1 = 5
  11. Growing of teeth in an infant is slow change.

    (a) True
    (b) False
  12. Burning of match stick is a reversible change.

    (a) True
    (b) False
  13. Change of New moon to Full moon is human made.

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

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

    (a) True
    (b) False
  16. 2 x 2 = 4
  17. Glowing of a bulb, lighting of a Candle, breaking of a coffee mug, curdling of milk

  18. Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene

  19. 3 x 2 = 6
  20. Curdling of milk : irreversible change :: Formation of clouds : ________change

  21. Dissolving of glucose : reversible change :: Digestion of food: ___________ change.

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

  23. 3 x 2 = 6
  24. What kind of a change is associated with decaying of a plants?

  25. Define a slow change.

  26. What is a solution?

  27. 2 x 3 = 6
  28. What happen when paper is burnt? Explain.

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

  30. 1 x 5 = 5
  31. 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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