UPSC CSE Prelims
Question 100
The Brahmaputra, Irrawady and Mekong rivers originate in Tibet and flow through narrow and parallel mountain ranges in their upper reaches. Of these rivers, Brahmaputra makes a "U" turn in its course to flow into India. This "U" turn is due to
View correct answer and explanation
Correct answer: B
Correct Option: B
Explanation: The Brahmaputra makes a sharp bend around Namcha Barwa near the eastern Himalayan syntaxis before entering India as the Siang; structural bending controls this course.
Option-wise Analysis:
A: Incorrect - Himalayan uplift broadly shapes drainage but does not specify the distinctive hairpin bend.
B: Correct - the eastern Himalayan syntaxis accounts for the U-turn near Namcha Barwa.
C: Incorrect - Generic Tertiary tectonic disturbance is too unspecific.
D: Incorrect - Option A is general, while B provides the precise cause; so combining both is not the best answer.