Some important MCQs related to Geological works by Wind With explanations -1

1. What is the process in which wind removes pfiner particles from the surface and leaves behind larger, heavier materials, forming a layer of gravel and pebbles?

a) Deflation

b) Suspension

c) Saltation

d) Abrasion

Answer: a) Deflation

Explanation:

Deflation is the process where the wind removes smaller particles from the surface, leaving behind larger, heavier materials like gravel and pebbles. This process is commonly observed in desert areas and results in the formation of desert pavements.

---

2. Which of the following is NOT a type of wind-deposited landform?

a) Sand dune

b) Loess

c) Pediment

d) Desert pavement

Answer: c) Pediment

Explanation:

A pediment is a broad, gently sloping bedrock surface found at the base of mountain ranges, typically formed by erosion from running water, not by wind. Sand dunes, loess, and desert pavement, on the other hand, are all landforms created by wind processes.

---

3. What is the term used for the erosion process in which the wind removes fine particles, such as dust and silt, from the ground surface?

a) Abrasion

b) Deflation

c) Suspension

d) Saltation

Answer: b) Deflation

Explanation:

Deflation is the process where wind removes smaller particles, like dust and silt, from the surface. This can lead to the formation of depressions or blowouts in the landscape, often found in arid regions.

---

4. What type of wind-blown deposit consists of very fine particles, such as clay and silt, and is commonly found in regions with glacial history?

a) Sand

b) Loess

c) Gravel

d) Rock debris

Answer: b) Loess

Explanation:

Loess is a wind-blown deposit of fine particles, primarily silt and clay, that forms over large areas. It is often found in regions with glacial history and is highly fertile, making it ideal for agriculture.

---

5. Which type of dune is formed when wind moves sand in one direction, creating large parallel ridges oriented along the direction of the wind?

a) Barchan dune

b) Longitudinal dune

c) Star dune

d) Parabolic dune

Answer: b) Longitudinal dune

Explanation:

Longitudinal dunes form in regions where the wind blows consistently in one direction. These dunes are characterized by long, parallel ridges that are aligned with the prevailing wind direction.

---

6. What is the term for a rock or mineral that has been shaped and smoothed by the abrasive action of windblown sand?

a) Pediment

b) Ventifact

c) Blowout

d) Erratic

Answer: b) Ventifact

Explanation:

Ventifacts are rocks that have been shaped and smoothed by the continuous abrasive action of wind-blown sand. They are commonly found in desert regions and can show multiple facets from the direction of the wind.

---

7. What type of sand dune is typically found in coastal regions where the wind is variable and vegetation partially stabilizes the sand?

a) Star dune

b) Parabolic dune

c) Barchan dune

d) Longitudinal dune

Answer: b) Parabolic dune

Explanation:

Parabolic dunes form in coastal regions where vegetation partially stabilizes the sand. These dunes are U-shaped, with the open end facing the wind. They are common in areas with variable wind directions.

---

8. What is the term for a landform created by wind that involves the erosion of a depression in the ground, usually in areas with little vegetation?

a) Pediment

b) Blowout

c) Sand dune

d) Bluff

Answer: b) Blowout

Explanation:

A blowout is a depression created by wind erosion in areas with sparse vegetation. It occurs when the wind removes fine particles from the surface, leaving behind a hollow or basin-like feature.

---

9. What type of feature is created when wind deposits a layer of fine, silt-sized particles over a large area, often forming fertile soil?

a) Sand dune

b) Loess

c) Gravel bed

d) Desert pavement

Answer: b) Loess

Explanation:

Loess is a fine, wind-blown deposit of silt and clay that forms large, fertile soil layers. It is typically found in regions with a history of glaciation and is important for agriculture.

---

10. What is the primary factor that contributes to the formation of sand dunes?

a) Wind velocity

b) Water flow

c) Ice movement

d) Plant growth

Answer: a) Wind velocity

Explanation:

The formation of sand dunes is primarily driven by wind velocity. When the wind is strong enough to transport sand and slows down to deposit it, dunes form. The shape and size of dunes depend on factors like wind strength, direction, and sand availability.

---

11. What is the term for the process where wind carries larger particles like sand and pebbles along the ground in a rolling motion?

a) Suspension

b) Saltation

c) Traction

d) Deflation

Answer: c) Traction

Explanation:

Traction is the process in which larger particles, such as sand and pebbles, are rolled or pushed along the surface by the wind. Unlike saltation, where particles bounce, traction involves the dragging of larger particles along the ground.

---

12. What is the characteristic feature of a star dune?

a) Crescent shape with steep sides

b) Long parallel ridges

c) Multiple arms radiating from a central peak

d) U-shape with vegetation at the tips

Answer: c) Multiple arms radiating from a central peak

Explanation:

Star dunes are characterized by multiple arms or ridges that radiate from a central point. These dunes are typically formed in areas with highly variable wind directions, such as desert regions with shifting winds.