Matter Book Back Questions

8th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. Matter is composed of

    (a)

    atoms

    (b)

    molecules

    (c)

    ions

    (d)

    all of the above

  2. Which one of metal possess low tensile strength?

    (a)

    Silver

    (b)

    Copper

    (c)

    Zinc

    (d)

    Aluminium

  3. The property which allows metals to be hammered into their sheets is ___________

    (a)

    ductility

    (b)

    malleability

    (c)

    conductivity

    (d)

    tensile strength

  4. 4 x 1 = 4
  5. The element which possess character of both metals and non metals are called_______.

    ()

    metalloids

  6. Material which has a definite volume but no definite shape and has one free surface is called as ______

    ()

    liquid

  7. The non-metal used in the manufacture of gun powder and vulcanization of rubber is

    ()

    Sulphur

  8. _______is the hardest naturally occurring substance.

    ()

    Dlamond

  9. 3 x 1 = 3
  10. Iron

  11. (1)

    building block of matter

  12. Tungsten

  13. (2)

    Making the filament of abulb

  14. Atom

  15. (3)

    Sewing needle

    2 x 1 = 2
  16. Give reasons for the following.
    (a) Aluminum foils are used to wrap food items.
    (b) Immersion rods for heating liquids are made up of metallic substances.
    (c) A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron.
    (d) Sodium and potassium are stored in kerosene.
    (e) Mercury is used in thermometers.

  17. Why wires cannot be drawn from materials such as stone or wood?

  18. 3 x 2 = 6
  19. Why are bells made of metals?

  20. What does a chemical symbol represent?

  21. Give two examples for metalloids.

  22. 4 x 3 = 12
  23. Can you store pickle in an aluminium utensil? Explain.

  24. Name six common non-metals and write their symbols.

  25. Mention any four compounds and their uses.

  26. Mention the metals that are used in jewellery.

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