Matter Important Questions

8th Standard EM

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Matter is composed of

    (a)

    atoms

    (b)

    molecules

    (c)

    ions

    (d)

    all of the above

  2. The Pictorial symbol for water given by the alchemists was

    (a)

    (b)

    (c)

    (d)

  3. Symbol of Mercury is

    (a)

    Ag

    (b)

    Hg

    (c)

    Au

    (d)

    Pb

  4. Which one of metal possess low tensile strength?

    (a)

    Silver

    (b)

    Copper

    (c)

    Zinc

    (d)

    Aluminium

  5. The non-metal which conduct current is

    (a)

    carbon

    (b)

    oxygen

    (c)

    aluminium

    (d)

    sulphur

  6. 5 x 1 = 5
  7. The element which possess character of both metals and non metals are called_______.

    ()

    metalloids

  8. The symbol of Tungsten________

    ()

    W

  9. Water contains _______ and ______ element

    ()

    hydrogen, oxygen

  10. _______is so hard that it can scratch glass.

    ()

    Osmium

  11. _______is the hardest naturally occurring substance.

    ()

    Dlamond

  12. 5 x 1 = 5
  13. Iron

  14. (1)

    Sewing needle

  15. Tungsten

  16. (2)

    building block of matter

  17. Atom

  18. (3)

    building block of matter

  19. Compound

  20. (4)

    Natrium

  21. Sodium

  22. (5)

    Making the filament of abulb

    2 x 2 = 4
  23. Mercury: liquid metal_________liquid non-metal

  24. Sodium bicarbonate; Baking Soda;Sodium Carbonate___________

  25. 6 x 2 = 12
  26. What is ductility?

  27. Write the symbols for these elements
    a) Oxygen b) Gold
    c) calcium d) cadmium e) Iron

  28. Name two soft metals that can be cut with a knife.

  29. Give two examples for metalloids.

  30. Write three properties of metalloids.

  31. What is matter?

  32. 3 x 3 = 9
  33. Define tensile strength.

  34. Name the elements for following symbols.
    a) Na b) W c) Ba d) Al e) U

  35. Mention the metals that are used in jewellery.

  36. 2 x 5 = 10
  37. Explain the physical properties of metals.

  38. write the uses of some metals

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