Term 2 Changes Around Us Model Question Paper

7th Standard EM

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Science

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5
  1. When a woolen yarn is knitted to get a sweater, the change can be classified as _______ .

    (a)

    physical change

    (b)

    chemical change

    (c)

    endothermic change

    (d)

    exothermic change

  2. ___________ of the following are endothermic changes.

    (a)

    Condensation and melting

    (b)

    Condensation and freezing

    (c)

    Evaporation and melting

    (d)

    Evaporation and freezing

  3. The chemical change is ____________ .

    (a)

    water to clouds

    (b)

    growth of a tree

    (c)

    cow dung to bio-gas.

    (d)

    ice-cream to molten ice-cream.

  4. ________is an example of a periodic change.

    (a)

    Earthquake.

    (b)

    Formation of rainbow in sky

    (c)

    Occurrence of tides in seas.

    (d)

    Showering of rain

  5. _________ is not a chemical change.

    (a)

    Dissolution of ammonia in water

    (b)

    Dissolution of carbon-di-oxide in water

    (c)

    Dissolution of oxygen in water

    (d)

    Melting of polar ice caps

  6. 5 x 2 = 10
  7. State two examples of periodic changes.

  8. Mention any two exothermic reactions.

  9. Cold milk is heated and it becomes hot. Which type of change it is?

  10. What type of change is colouring of a paper?

  11. What type of energy changes is associated when ice melts?

  12. 5 x 3 = 15
  13. Classify the following changes as physical and chemical changes
    A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
     

    Physical changes Chemical changes
       
       
       
       
       
  14. Distinguish physical and chemical changes.

  15. How can a change occur in a substance?

  16. Can you suggest a method to collect water from sea water?

  17. Is solar eclipse a periodic change? Give your reason.

  18. 2 x 5 = 10
  19. A very hot glass on putting in cold water cracks. What does this change indicate?

  20. Boiling of water is a physical change; but boiling of egg is a chemical change. Why?

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