Some important MCQs related to Geological works by Wind With Explanations -3

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21. Which of the following is an example of a wind-eroded hollow?

A) Playa
B) Blowout
C) Barchan
D) Loess plateau

Answer: B) Blowout
Explanation:
Blowouts are depressions or hollows created in loose sand or soil when wind removes large amounts of material, typically in areas with little vegetation to hold the soil in place.


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22. In which direction do seif dunes align relative to the wind?

A) Perpendicular to the wind
B) Parallel to the prevailing wind
C) Against the prevailing wind
D) Randomly aligned

Answer: B) Parallel to the prevailing wind
Explanation:
Seif dunes are long, narrow sand dunes that form parallel to the direction of the prevailing wind due to consistent wind patterns.


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23. What happens during the process of "attrition" in wind action?

A) Wind removes small particles, leaving larger ones behind.
B) Particles collide with each other, becoming smaller and more rounded.
C) Wind carries particles in suspension over long distances.
D) Wind deposits sand in crescent-shaped dunes.

Answer: B) Particles collide with each other, becoming smaller and more rounded.
Explanation:
Attrition is a process where particles carried by wind collide with each other, causing them to break into smaller, smoother, and more rounded fragments.


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24. Which of the following factors is most crucial for the formation of loess deposits?

A) High wind velocity
B) Presence of vegetation
C) Availability of fine silt
D) High precipitation

Answer: C) Availability of fine silt
Explanation:
Loess deposits are formed from fine silt particles that are transported by wind and deposited over large areas, often near glaciers or deserts where silt is abundant.


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25. What is the term used for sand and dust storms caused by strong winds in desert regions?

A) Abrasion storms
B) Haboobs
C) Deflation storms
D) Aeolian cyclones

Answer: B) Haboobs
Explanation:
Haboobs are intense dust or sand storms caused by strong winds, often associated with downdrafts from thunderstorms in desert regions.

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26. What role does vegetation play in controlling wind erosion?

A) It increases wind velocity near the ground.
B) It traps moisture, making soil particles heavier.
C) It stabilizes the soil and reduces deflation.
D) It promotes saltation.

Answer: C) It stabilizes the soil and reduces deflation.
Explanation:
Vegetation acts as a protective cover, anchoring soil particles with roots and reducing the impact of wind on the surface, thereby minimizing erosion.


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27. The term "erg" refers to:

A) A depositional feature formed by rivers
B) A large, flat area of sand dunes in a desert
C) A wind-eroded depression
D) A rocky desert

Answer: B) A large, flat area of sand dunes in a desert
Explanation:
An erg, also known as a sand sea, is an extensive region of desert covered by sand dunes, such as the Sahara Desert's Great Sand Sea.

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28. Which type of wind-transported particle movement involves the particles being rolled along the ground?

A) Suspension
B) Saltation
C) Creep
D) Abrasion

Answer: C) Creep
Explanation:
Creep involves larger particles, like pebbles or coarse sand, being rolled or dragged along the ground by the force of the wind.


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29. What is a "Zeugen"?

A) A wind-eroded ridge with a resistant cap rock
B) A crescent-shaped sand dune
C) A flat desert plain
D) A loess deposit

Answer: A) A wind-eroded ridge with a resistant cap rock
Explanation:
Zeugens are ridges formed in arid regions where alternating layers of hard and soft rock are exposed to wind erosion, leaving behind resistant ridges.


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30. Which of the following conditions is most conducive to wind deposition?

A) Strong winds and loose soil
B) Low wind velocity and availability of loose particles
C) Wet and compacted soil
D) High vegetation cover

Answer: B) Low wind velocity and availability of loose particles
Explanation:
Wind deposition occurs when the wind's velocity decreases, losing the energy to carry particles, causing them to settle and accumulate in areas with loose, dry material.


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31. Which term describes desert surfaces covered with a layer of pebbles and cobbles?

A) Reg
B) Erg
C) Playa
D) Sand dune

Answer: A) Reg
Explanation:
A reg, also called a desert pavement, is a desert surface covered with closely packed, interlocking angular or rounded rock fragments left behind after finer materials are blown away by wind.


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32. What are the main materials transported by wind in arid regions?

A) Gravel and boulders
B) Clay, silt, and sand
C) Organic matter
D) Limestone and shale fragments

Answer: B) Clay, silt and sand.

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