Thu. Jan 9th, 2025

Continents and Oceans

  1. What is the rate of expansion of the Atlantic and Indian Oceans?

    Options:
    1. 6.0 cm per year
    2. 1.0 to 1.5 cm per year
    3. 3.0 to 3.5 cm per year
    4. 2.0 to 2.5 cm per year

    Option: B

  2. What causes alternate stripes of positive and negative magnetic anomalies on either side of the mid-oceanic ridges?

    Options:
    1. Temporal reversal in the geomagnetic field
    2. Continental drift
    3. Earthquakes
    4. Volcanic eruptions

    Option: A

  3. How is the rate of sea-floor spreading calculated?

    Options:
    1. On the basis of the age of isochrons
    2. On the basis of distance between two isochrons
    3. Both A and B
    4. None of the above

    Option: C

  4. What is the evidence for the mobility of continents and ocean basins?

    Options:
    1. Plate tectonics
    2. Sea-floor spreading
    3. Palaeomagnetism
    4. All of the above

    Option: D

  5. Which is the residual of once very vast ocean?

    Options:
    1. Atlantic Ocean
    2. Pacific Ocean
    3. Mediterranean Sea
    4. Red Sea

    Option: C

  6. How is the Pacific Ocean contracting?

    Options:
    1. By gradual subduction of American Plate along its ridge
    2. By expansion due to plate motions
    3. By subduction of Indian Plate
    4. None of the above

    Option: A

  7. What happens when oceans begin to close?

    Options:
    1. Continents come closer to each other
    2. Continents are displaced away
    3. Oceans get deeper
    4. None of the above

    Option: A

  8. Who attempted to reconstruct the chronological sequence of the continents and ocean basins from the beginning to the present time?

    Options:
    1. Valentine and Moors
    2. Hallam
    3. Dan Mackenzie and John Sclater
    4. F.J. Vine

    Option: A

  9. What is the rate at which the Red Sea is spreading?

    Options:
    1. One centimetre per year
    2. Two centimetres per year
    3. Three centimetres per year
    4. Four centimetres per year

    Option: A

  10. How is the Pacific Ocean shrinking in size?

    Options:
    1. By expansion of the Atlantic and Indian Oceans
    2. By westward movement of the Americas
    3. By subduction of American Plate
    4. None of the above

    Option: B

  11. What is the Mediterranean Sea a residual of?

    Options:
    1. Atlantic Ocean
    2. Pacific Ocean
    3. Tethys Sea
    4. Indian Ocean

    Option: C

  12. When did the first Pangaea break apart?

    Options:
    1. 700 million years before present
    2. 600-500 million years before present
    3. 300-200 million years before present
    4. 150 million years before present

    Option: B

  13. When did the Atlantic Ocean begin to open up?

    Options:
    1. 700 million years before present
    2. 400 million years before present
    3. 150 million years before present
    4. 200 million years before present

    Option: A

  14. What is the Red Sea an example of?

    Options:
    1. A volcanic island chain
    2. A mountain range
    3. An axial trough
    4. A continental shelf

    Option: C

  15. What is the rate of spreading of the Red Sea according to F.J. Vine?

    Options:
    1. 1 cm/year
    2. 2 cm/year
    3. 3 cm/year
    4. 4 cm/year

    Option: B

  16. Which ocean is continuously expanding for the last 200 million years?

    Options:
    1. Indian Ocean
    2. Atlantic Ocean
    3. Pacific Ocean
    4. Arctic Ocean

    Option: B