Matter Around Us Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The physical state of water at 373 K is

    (a)

    Solid

    (b)

    liquid

    (c)

    vapour

    (d)

    plasma

  2. The separation of denser particles from lighter particles done by rotation at high speed is called ________

    (a)

    Filtration

    (b)

    sedimentation

    (c)

    decantation

    (d)

    centrifugation

  3. Filtration method is effective in separating _______ mixture

    (a)

    Solid-solid

    (b)

    solid-liquid

    (c)

    liquid-liquid

    (d)

    liquid-gas

  4. Solids_____into liquid

    (a)

    freezes

    (b)

    condenses

    (c)

    vaporises

    (d)

    melts

  5. _____ is a process by which a substance changes from the liquid to gaseous state.

    (a)

    Boiling

    (b)

    Evaporation

    (c)

    Melting

    (d)

    Condensation

  6. 5 x 2 = 10
  7. Why is it possible to row a boat in water but not pass through a wooden fence

  8. Which state of matter has the highest kinetic energy?

  9. Define a solute and a solvent

  10. Is air a pure substance or Mixture? Justify

  11. You must have seen brass statues in museums and places of worship.Brass is an alloy made up of approx.30% zinc and 70% copper.Is Brass a pure substance or a mixture or compound?

  12. 5 x 3 = 15
  13. What is an adsorbate and adsorbent?

  14. Differentiate between filtrate and distillate

  15. Why do solids have fixed shape?

  16. What is melting point?

  17. What is boiling point?

  18. 2 x 5 = 10
  19. Write the differences between suspension, colloidal solution and true solution

  20. What is centrifugation? Write the applications of centrifugation

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