1. Consider the following processes regarding wind erosion:
- Deflation refers to the removal of loose particles from the surface of rocks.
- Abrasion is the frictional movement of sand particles within themselves.
- Attrition involves the scraping of particles from the rock surface.
Which of the above are explained correctly?
[A] Only 1
[B] Only 1 and 2
[C] Only 2 and 3
[D] 1, 2 and 3
Show Answer
Correct Answer: C [Only 2 and 3]
Notes:
Only statement 1 is correct. Deflation is the removal of loose particles from rock surfaces by wind. Abrasion involves rock surfaces being worn away by particles carried by the wind, not particles moving within themselves. Attrition is the breakdown of particles due to collision with one another, not scraping of rock surfaces. Thus, 2 and 3 are incorrectly explained.
2. Consider the following landforms associated with wind activity:
- Ripples
- Zeugen
- Seif
- Yardangs
- Loess
Which of the above are depositional landforms formed by the action of wind?
[A] Only 2, 4 and 5
[B] Only 1, 2, 3 and 4
[C] 1, 2, 3, 4 and 5
[D] Only 1, 3 and 5
Show Answer
Correct Answer: D [Only 1, 3 and 5]
Notes:
Ripples, Seif (seif dunes), and Loess are considered depositional landforms created by wind. Ripples and seif dunes result from sand deposition, while loess is formed by the wind-blown accumulation of silt. Zeugen and Yardangs, in contrast, are primarily erosional features formed by wind abrasion on rock surfaces.
3. Consider the following rivers:
- Narmada
- Mahi
- Luni
- Tawa
- Sharavathi
Which of the above are west flowing rivers that drain into the Arabian Sea?
[A] Only 1, 2 and 3
[B] Only 1, 2, 3 and 4
[C] Only 1, 2 and 4
[D] Only 1, 2 and 5
Show Answer
Correct Answer: D [Only 1, 2 and 5]
Notes:
Narmada, Mahi, and Sharavathi are west-flowing rivers draining into the Arabian Sea. Luni, although flowing west, is endorheic and does not reach the Arabian Sea. Tawa is a tributary of Narmada and does not independently reach the sea. Hence, only 1, 2, and 5 drain west into the Arabian Sea.
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