Hydrosphere Book Back Questions

9th Standard

    Reg.No. :
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Social Science

Time : 00:30:00 Hrs
Total Marks : 25
    4 x 1 = 4
  1. The Sunda Trench lies in the____________ ocean.

    (a)

    Atlantic

    (b)

    Pacific

    (c)

    Indian

    (d)

    Antarctic

  2. Ocean currents are produced due to________

    (a)

    due to rotation of earth

    (b)

    due to variation in temperature

    (c)

    due to earth's movement

    (d)

    all the above

  3. Which of the following is not correctly matched?

    (a)

    Gulf Stream - Pacific Ocean

    (b)

    Labrador current - North Atlantic Ocean

    (c)

    Canary current - Mediterranean sea

    (d)

    Mozambique current - Indian Ocean

  4. The amount of planktons to be found in the ocean is determined by
    1. Depth of the water.
    2. Ocean currents.
    3. Temperature and Salinity.
    4. Length of day and night.

    (a)

    1 and 2 are correct

    (b)

    1,2 and 3 are correct

    (c)

    1,3 and 4 are correct

    (d)

    All are correct

  5. 5 x 1 = 5
  6. Mariana trench

  7. (1)

    Decreases salinity in the oceans

  8. Great Barrier Reef

  9. (2)

    On full and new moon days

  10. Spring tides

  11. (3)

    Second order landform

  12. Heavy rains

  13. (4)

    Australia

  14. Continental slope

  15. (5)

    Deepest point in the Pacific

    1 x 2 = 2
  16. Spring tide and Neap tide.

  17. 1 x 5 = 5
  18. The oceans are salty. Why?

  19. 3 x 3 = 9
  20. What is hydrological cycle?

  21. Write a brief note on sea waves.

  22. What do you mean by the ocean salinity?

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