Acme Ai
A
अ
Question No. 246Interactive Test Mode
00:00
+2-0.66

Q246. The Brahmaputra, Irrawaddy 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

The Brahmaputra, Irrawaddy 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

Select the correct option below (or cross out options to eliminate)

Official Answer Key & Detailed Solution

Ready to check the official UPSC Answer Key?

Click any option above to test yourself under exam conditions, or reveal the explanation directly.

Official UPSC Answer KeyUPSC Prelims 2011 • Geography

Correct Answer: Option (B) — Syntaxial bending of geologically young Himalayas

Concept & Option Breakdown

Standard Reference Verified

The Brahmaputra (Tsangpo) flows eastward in Tibet and suddenly takes a sharp hairpin/U-turn around the Namcha Barwa peak to enter India (Arunachal Pradesh). This abrupt change in direction is due to the syntaxial bending (sharp knee-bend tectonic syntax) of the geologically young Himalayan fold mountain belt at its eastern extremity.

Elimination Heuristic & Exam Approach

The sharp directional loop of the Brahmaputra at Namcha Barwa is a textbook geomorphological example of Himalayan syntaxial bending.

Reviewed by Avinash Sir & Acme AI Research Team

Practice Full-Length & Sectional Prelims Mocks on this Interface

50 simulated tests in the APT Prelims Test Series (₹1,493) or 1-on-1 Mentorship with Avinash Sir.

Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2011 (Q246)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicGeography → Geomorphology
Official Answer KeyOption (B) — Syntaxial bending of geologically young Himalayas

More PYQs from Geography (Geomorphology)

Master the Geography syllabus cluster by practicing these related previous year questions.

View All Geography PYQs

Frequently Asked Questions — UPSC Prelims 2011 Q246

What is the official answer for UPSC Prelims 2011 GS Paper I Question 246 (Geography)?

The official UPSC answer key for this 2011 Geography (Geomorphology) question is Option (B): "Syntaxial bending of geologically young Himalayas". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2011 question belong to?

This question belongs to GS Paper I under the subject "Geography" and micro-topic "Geomorphology". You can explore all repeated questions from Geomorphology in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Geomorphology UPSC Prelims question using option elimination?

The sharp directional loop of the Brahmaputra at Namcha Barwa is a textbook geomorphological example of Himalayan syntaxial bending.

Beyond Previous Year Questions

Structured Prelims Practice & Mentorship

Pair previous year question analysis with full-length simulated mock tests and 1-on-1 faculty guidance.

APT 2027 • 50 Prelims Tests17% OFF

Acme Prelims Test Series (APT)

Built to eliminate 1/3rd negative marking losses and 50–50 option traps through structured simulation and NCERT-backed keys.

  • 50 High-Yield Tests: Subject Sectionals, Current Affairs, CSAT Paper II & Full-Length Simulators
  • 1/3rd Penalty & Trap Analytics: Identify whether marks are lost to over-attempting or conceptual gaps
  • Option-by-Option NCERT Keys: Detailed distractor analysis and elimination logic for every question
  • Custom PDF-to-Mock Generator: Convert your revision notes or current affairs PDFs into practice tests
Complete 50-Test Package
₹1,493₹1,799• Valid till Prelims 2027
1-on-1 Personal MentorshipCapped at 10 Seats

1-on-1 UPSC Mentorship with Avinash Sir

Weekly 1-on-1 strategy reviews, daily study accountability, and personalized MCQ attempt audits with an experienced UPSC mentor.

  • Weekly 1-on-1 Sessions: Direct mentorship with Avinash Sir (Former Plutus IAS Mentor, UPSC & UPPCS Mains Written)
  • APT 50-Test Series Included: Full Prelims GS1 & CSAT test series bundled at no additional cost
  • Mock Attempt & Elimination Audit: Question-by-question review to calibrate your risk and attempt accuracy
  • Prelims & Integrated Tracks: Available as dedicated Prelims mentorship or end-to-end Prelims + Mains guidance
Prelims & Integrated Tracks
17% OFF• Includes APT 50-Test Series