Fri. Jan 10th, 2025

Movement of the Earth

  1. The forces responsible for the formation of a rift valley are

    Options:
    1. Endogenetic forces caused by horizontal and vertical movements.
    2. Exogenetic forces caused by erosion.
    3. Biological forces caused by the growth of plant roots.
    4. Human forces caused by mining and drilling.

    Option: A

  2. What is a graben?

    Options:
    1. A term used synonymously with rift valley.
    2. A mountain range formed by the collision of two tectonic plates.
    3. A depression in the ocean floor caused by volcanic activity.
    4. A circular basin formed by the erosion of a volcano.

    Option: A

  3. How is a graben different from a rift valley?

    Options:
    1. A graben is relatively smaller in size than a rift valley.
    2. A graben is deeper than a rift valley.
    3. A graben is wider than a rift valley.
    4. There is no difference between a graben and a rift valley.

    Option: A

  4. What is the best example of a well-defined rift valley?

    Options:
    1. Rhine rift valley.
    2. Jordan river valley.
    3. Dead Se
    4. Narmada valley.

    Option: A

  5. Where are the deepest grabens found?

    Options:
    1. In the form of ‘ocean deeps and trenches on the ocean floor.
    2. In the middle of continents.
    3. In volcanic regions.
    4. In areas with high seismic activity.

    Option: A

  6. The floor level of the Dead Sea is

    Options:
    1. 867 m above sea level.
    2. 867 m below sea level.
    3. At sea level.
    4. 433 m below sea level.

    Option: B

  7. What is the process called when one portion overrides the other portion due to the formation of a crack?

    Options:
    1. Thrusting
    2. Down thrusting
    3. Rift valley
    4. Compression

    Option: A

  8. What is the width of the rift valley according to E. Bullard if the depth of the valley is 20 km and the density of the substratum is taken to be 3.3?

    Options:
    1. 40 km
    2. 60 km
    3. 65 km
    4. 80 km

    Option: A

  9. According to E. Bullard, can the rift block slip downward under the impact of gravity?

    Options:
    1. Yes
    2. No
    3. It depends on the compressive force
    4. It depends on the elasticity of the rocks

    Option: B

  10. What is the first stage of the formation of a rift valley according to E. Bullard?

    Options:
    1. Development of a crack due to compressive force
    2. Buckling of the crustal rocks due to compression
    3. Horizontal movement of the crustal rocks
    4. Development of parallel normal faults due to tensional force

    Option: B

  11. What are the two categories of hypotheses regarding the origin of the rift valleys?

    Options:
    1. Tensional hypothesis and compressive hypothesis
    2. Tensional hypothesis and shear hypothesis
    3. Compressive hypothesis and shear hypothesis
    4. Tensional hypothesis and bending hypothesis

    Option: A

  12. What was the earlier hypothesis of the origin of the rift valleys based on?

    Options:
    1. The concept of the ‘dropped keystone of the arch’ of a building
    2. The concept of volcanic eruptions
    3. The concept of plate tectonics
    4. The concept of seismic waves

    Option: A

  13. Why was the ‘keystone hypotheses severely criticized?

    Options:
    1. It was based on erroneous concepts and beliefs
    2. It did not consider the role of volcanic eruptions
    3. It did not consider the role of plate tectonics
    4. It did not consider the role of seismic waves

    Option: A