Matter Around Us - Important Question Paper

9th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    10 x 1 = 10
  1. The physical state of water at 373 K is

    (a)

    Solid

    (b)

    liquid

    (c)

    vapour

    (d)

    plasma

  2. Among the following______is a mixture

    (a)

    Common Salt

    (b)

    Juice

    (c)

    Carbon dioxide

    (d)

    Pure Silver

  3. When we mix a drop of ink in water we get a__________

    (a)

    Heterogeneous Mixture

    (b)

    Homogeneous Mixture

    (c)

    Compound

    (d)

    Suspension

  4. The constituents that form a mixture are also called

    (a)

    Elements

    (b)

    Compounds

    (c)

    Alloys

    (d)

    Components

  5. __________ has the same properties throughout the sample

    (a)

    Pure substance

    (b)

    Mixture

    (c)

    Colloid

    (d)

    Suspension

  6. Difference in ________________is the principle used in fractional distillation

    (a)

    solubility

    (b)

    melting point

    (c)

    boiling point

    (d)

    adsorption

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

    (a)

    Filtration

    (b)

    sedimentation

    (c)

    decantation

    (d)

    centrifugation

  8. ______ is essential to perform separation by solvent extraction method.

    (a)

    Separating funnel

    (b)

    centrifuge machine

    (c)

    filter paper

    (d)

    sieve

  9. Filtration method is effective in separating _______ mixture

    (a)

    Solid-solid

    (b)

    solid-liquid

    (c)

    liquid-liquid

    (d)

    liquid-gas

  10. For a simple distillation process we need to have

    (a)

    an evaporating dish

    (b)

    a separating funnel

    (c)

    a filter with filter paper

    (d)

    a Liebig condenser

  11. Part B

    7 x 1 = 7
  12. 1500C = __________ K

    ()

      

  13. Evaporation is always accompanied by______________ in temperature

    ()

    increase

  14. A _____mixture has no distinguishable boundary between its components

    ()

    homogeneous

  15. Latent heat is the energy used for ________

    ()

    change of state

  16. Alcohol can be separated from water by _________________

    ()

    fractional distillation

  17. Sand is removed from naphthalene by ___________ method.

    ()

    sublimation

  18. In petroleum refining, the method of separation used is _______

    ()

    Fractional distillation

  19. Part C

    4 x 2 = 8
  20. How gaseous pressure arises?

  21. Define Sublimation

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

  23. Define a solute and a solvent

  24. Part D

    5 x 3 = 15
  25. Which of the following are pure substances? Ice, Milk, Iron, Hydrochloric acid, Mercury, Brick and Water.

  26. Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?

  27. What is an adsorbate and adsorbent?

  28. Name the apparatus that you will use to separate the components of mixtures containing two, i. miscible liquids, ii. immiscible liquids

  29. How will you separate a mixture containing saw dust, naphthalene and iron filings?

  30. Part E

    2 x 5 = 10
  31. Explain Tyndall effect and Brownian movement with suitable diagram

  32. How are homogenous solutions different from heterogeneous solution? Explain with examples

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