Fri. Jan 10th, 2025

River Valleys and Graded River

  1. What happens to the energy of an undisturbed river system over time?

    Options:
    1. It remains constant
    2. It gradually decreases
    3. It gradually increases
    4. It fluctuates

    Option: B

  2. Can a river be graded at a higher gradient than another river graded at a lower gradient?

    Options:
    1. Yes, it is possible
    2. No, it is not possible
    3. It depends on the type of river
    4. It depends on the location of the river

    Option: A

  3. Is a graded river always loaded to its capacity?

    Options:
    1. Yes, always
    2. No, never
    3. It depends on the sediment load
    4. It depends on the flow velocity

    Option: B

  4. What should be the adjustment between to attain the graded stage of a river?

    Options:
    1. Adjustment between power (energy) and sediment load
    2. Adjustment between quantity and sediment load
    3. Adjustment between velocity and sediment load
    4. Adjustment between sediment load and resistance of bedrock

    Option: A

  5. Does the total mass or size of the sediment load affect the corrasive capacity of a river?

    Options:
    1. Only the total mass
    2. Only the size
    3. Both the total mass and size
    4. Neither the total mass nor the size

    Option: C

  6. What determines the overall grading of a river?

    Options:
    1. Sea-level
    2. Local and temporary base levels
    3. Resistance of bedrock
    4. Flow velocity

    Option: A

  7. Is the graded curve of a river regular from source to mouth?

    Options:
    1. Yes, always
    2. No, never
    3. It depends on the type of river
    4. It depends on the geomorphologist’s viewpoint

    Option: D

  8. Does vertical erosion or valley incision by a graded stream stop after the attainment of profile of equilibrium?

    Options:
    1. Yes, always
    2. No, never
    3. It depends on the type of river
    4. It depends on the location of the river

    Option: B

  9. What does equilibrium denote in the context of a river?

    Options:
    1. The limit of lateral erosion
    2. The limit of vertical erosion
    3. The point where the river stops eroding
    4. The balance between volume of water, transporting capacity and sediment load

    Option: D

  10. Why does the slope of a graded river change over time?

    Options:
    1. Due to variation in the quantity and caliber of sediment load
    2. Due to variation in the volume of water
    3. Due to variation in discharge
    4. All of the above

    Option: D

  11. What happens when there is an increase in sediment load and a decrease in the volume of water in a river?

    Options:
    1. The river starts eroding its valley
    2. The river starts depositing sediment
    3. The river remains in equilibrium
    4. The river becomes stagnant

    Option: B

  12. What is a regraded curve in the context of a river?

    Options:
    1. A curve where the river has achieved equilibrium
    2. A curve where the river has readjusted to new conditions after disturbance
    3. A curve where the river has stopped eroding
    4. A curve where the river has become stagnant

    Option: B

  13. What is the most significant causative factor for the disturbance in the graded profile of a river?

    Options:
    1. Increase in sediment load
    2. Decrease in the volume of water
    3. Increase or decrease in channel gradient
    4. Changes in discharge

    Option: C

  14. What is rejuvenation in the context of a river?

    Options:
    1. Sudden and phenomenal increase in the erosive power of the stream
    2. Steepening of channel gradient due to negative change in sea level or upliftment of land mass
    3. Increase in the volume of water in a river
    4. All of the above

    Option: B

  15. What happens when there is rejuvenation at the mouth of a river?

    Options:
    1. The river starts eroding its valley
    2. The graded profile of the river is disturbed and the river starts fresh vigorous valley deepening at its mouth
    3. The river remains in equilibrium
    4. The river becomes stagnant

    Option: B

  16. What is regrading in the context of river profiles?

    Options:
    1. When the river becomes overloaded with sediment load
    2. When the river decreases its erosive power
    3. When the river undergoes a disturbance in its graded profile
    4. When the river changes its course

    Option: C

  17. What causes rejuvenation in the middle course of a river?

    Options:
    1. Increase in sediment load by a tributary
    2. Decrease in sediment load by a tributary
    3. Increase in erosive power of the river due to flooding
    4. Decrease in erosive power of the river due to drought

    Option: B

  18. What is the result of rejuvenation in the middle course of a river?

    Options:
    1. The river becomes overloaded with sediment load
    2. The river decreases its erosive power
    3. The river deepens its valley downstream from the confluence
    4. The river widens its channel upstream from the confluence

    Option: C

  19. How does the gradient of the upstream section of a river change during headward erosion?

    Options:
    1. It becomes flatter
    2. It becomes steeper
    3. It remains the same
    4. It is not affected by headward erosion

    Option: B

  20. What is the result of rejuvenation in the headwaters of a river?

    Options:
    1. The river becomes overloaded with sediment load
    2. The river decreases its erosive power
    3. The headwater section of the river is rejuvenated
    4. The downstream section of the river is rejuvenated

    Option: C