Changes Around Us Model Question Paper

8th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Rusting of iron is a _________ change.

    (a)

    physical

    (b)

    chemical

    (c)

    physical and chemical

    (d)

    neutral

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

    (a)

    contact

    (b)

    electricity

    (c)

    light

    (d)

    heat

  3. The chemical reactions carried out by the passage of electricity is called.

    (a)

    Rusting

    (b)

    Thermolysis

    (c)

    Electrolysis

    (d)

    Photolysis

  4. Enzymes and yeasts are called

    (a)

    catalysts

    (b)

    bio catalysts

    (c)

    chemical catalysts

    (d)

    physical catalysts

  5. The brown colour of a cut apple is due to

    (a)

    rusting

    (b)

    rancidity

    (c)

    browning

    (d)

    fermentation

  6. 5 x 2 = 10
  7. What is rusting?

  8. What is electrolysis?

  9. What is photolysis?

  10. What is thermolysis?

  11. What is rancidity?

  12. 5 x 3 = 15
  13. Give a chemical reaction based on contact.

  14. Give a chemical reaction based on the solution of reactants?

  15. Give a chemical reaction based on electricity

  16. Give a chemical reaction based on heat.

  17. Write the chemical substances responsible for air pollution?

  18. 4 x 5 = 20
  19. Explain how food items are spoilt due to chemical reactions?

  20. Explain the biological effects of chemical reactions

  21. Explain the environmental effects of chemical reactions.

  22. What are the effects produced during chemical reactions?

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