Changes Around Us One Mark Questions

8th Standard EM

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Science

Time : 00:30:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. Burning of paper is a______ change.

    (a)

    Physical

    (b)

    chemical

    (c)

    physical & chemical

    (d)

    neutral

  2. The burning of matchstick is an example for chemical reaction based on______

    (a)

    Contact

    (b)

    electricity

    (c)

    light

    (d)

    catalyst

  3. ______ metal undergoes rusting.

    (a)

    tin

    (b)

    sodium

    (c)

    copper

    (d)

    iron

  4. Rusting of iron is a _________ change.

    (a)

    physical

    (b)

    chemical

    (c)

    physical and chemical

    (d)

    neutral

  5. Decomposition of limestone is an example for chemical reaction based on __________

    (a)

    contact

    (b)

    electricity

    (c)

    light

    (d)

    heat

  6. 5 x 1 = 5
  7. Reactants → ______.

    ()

    Products

  8. Photosynthesis is a chemical reaction that takes place in presence of _________.

    ()

    light

  9. Iron objects undergo rusting when exposed to ______ and ______.

    ()

    Water, Oxygen

  10. When quick lime comes in contact with When quick lime comes in contact with __________

    ()

    Slaked lime

  11. The sides of the matchbox contains _________

    ()

    Red phosphorous

  12. 5 x 1 = 5
  13. A chemical reaction is a temporary reaction.

    (a) True
    (b) False
  14. Change in colour may take place during a chemical reaction.

    (a) True
    (b) False
  15. Formation of slaked lime from quicklime is a endothermic reaction.

    (a) True
    (b) False
  16. CFC is a pollutant.

    (a) True
    (b) False
  17. Browning of some vegetables and fruits is due to tannin formation.

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Rusting

  20. (1)

    Pesticides

  21. Electrolysis

  22. (2)

    Brine

  23. Thermolysis

  24. (3)

    Detergents

  25. Water pollution

  26. (4)

    Decomposition of limestone

  27. Land pollution

  28. (5)

    Iron

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