Rivers & Soil: Essential Concepts for Competitive Exams

Rivers & Soil

Q. The soil of a riverbank is composed of 60% sand, 30% silt, and 10% clay. What is the percentage of silt in the soil? (2019)

Solution

The percentage of silt in the soil is given as 30%.

Correct Answer: A — 30%

Q. What is the effect of deforestation on river soil quality?

Solution

Deforestation decreases soil quality by increasing erosion and reducing the organic matter content in the soil.

Correct Answer: C — Decreases soil quality

Q. What is the primary cause of sediment transport in rivers?

Solution

Gravity is the primary force that causes sediment to be transported downstream in rivers.

Correct Answer: A — Gravity

Q. What is the primary factor that affects the soil erosion rate in riverbanks? (2023)

Solution

All of the above factors affect soil erosion rate.

Correct Answer: D — All of the above

Q. What is the term for the area of land that drains water into a river?

Solution

A watershed is the area of land that drains water into a river, collecting precipitation and runoff.

Correct Answer: A — Watershed

Q. Which of the following is a consequence of riverbank erosion?

Solution

All of the above are consequences of riverbank erosion, affecting the ecosystem and human activities.

Correct Answer: D — All of the above

Q. Which soil type is most prone to waterlogging in river basins?

Solution

Clayey soil has very low permeability, making it prone to waterlogging in river basins.

Correct Answer: B — Clayey soil

Q. Which type of soil is most commonly found in river valleys due to sediment deposition?

Solution

Loamy soil is a mixture of sand, silt, and clay, making it fertile and commonly found in river valleys due to sediment deposition.

Correct Answer: C — Loamy soil

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