Acme Ai
A
अ
GS Paper IUPSC Prelims 2018
World Geography
Question No. 431Interactive Test Mode
00:00
+2-0.66

Q431. Which of the following has/have shrunk immensely/dried up the recent past due to human activities? 1. Aral Sea 2. Black Sea 3. Lake Baikal Select the correct answer using the code given below:

Which of the following has/have shrunk immensely/dried up the recent past due to human activities?

  1. Aral Sea
  2. Black Sea
  3. Lake Baikal

Select the correct answer using the code given below:

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

Official Answer Key & Detailed Solution

3D PYQ Realm

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 2018 • Geography

Correct Answer: Option (A) — 1 only

Concept & Option Breakdown

Standard Reference Verified
  • Aral Sea (1): Has shrunk dramatically (losing about 90% of its volume and ~75% of its surface area) since the 1960s after the Soviet Union diverted its feeder rivers (Amu Darya and Syr Darya) for cotton irrigation.
  • Black Sea (2): An inland marginal sea connected to the Mediterranean; it has not experienced immense shrinkage.
  • Lake Baikal (3): The deepest freshwater lake in the world; while facing pollution challenges, it has not dried up or shrunk immensely.
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.

1-on-1 MentorshipOpen Test Platform

Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2018 (Q431)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicGeography → World Geography
Official Answer KeyOption (A) — (a) 1 only

More PYQs from Geography (World Geography)

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

View All Geography PYQs
2018 • Q432World Geography

Consider the following pairs: | Regions sometimes mentioned in news | Country | | :--- | :--- | | 1. Catalonia | Spain | | 2. Crimea | Hungary | | 3.

GeographyPractice
2018 • Q433World Geography

Consider the following pairs: | Towns sometimes mentioned in news | Country | | :--- | :--- | | 1. Aleppo | Syria | | 2. Kirkuk | Yemen | | 3. Mosul

GeographyPractice
2017 • Q429World Geography

Mediterranean Sea is a border of which of the following countries? 1. Jordan 2. Iraq 3. Lebanon 4. Syria Select the correct answer using the code giv

GeographyPractice
2015 • Q428World Geography

Which one of the following countries of South-West Asia does not open out to the Mediterranean Sea?

GeographyPractice
2014 • Q425World Geography

Turkey is located between:

GeographyPractice
2014 • Q426World Geography

What is the correct sequence of occurrences of the following cities in South-East Asia as one proceeds from south to north? 1. Bangkok 2. Hanoi 3. Jak

GeographyPractice
2013 • Q427World Geography

Which one of the following pairs is correctly matched? | Geographical Feature | Region | | :--- | :--- | | (a) Abyssinian Plateau | Arabia | | (b) At

GeographyPractice
2011 • Q434World Geography

Between India and East Asia, the navigation-time and distance can be greatly reduced by which of the following? 1. Deepening the Malacca straits betwe

GeographyPractice

Frequently Asked Questions — UPSC Prelims 2018 Q431

What is the official answer for UPSC Prelims 2018 GS Paper I Question 431 (Geography)?

The official UPSC answer key for this 2018 Geography (World Geography) question is Option (A): "(a) 1 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2018 question belong to?

This question belongs to GS Paper I under the subject "Geography" and micro-topic "World Geography". You can explore all repeated questions from World Geography 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 World Geography UPSC Prelims question using option elimination?

To solve World Geography questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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
Explore APT Test SeriesTry Free Mock
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
Explore 1-on-1 MentorshipCompare Tracks
Previous QuestionIf a commodity is provided free to the public by the Government, then
Next QuestionConsider the following pairs: | Regions sometimes mentioned in news | Country | | :--- | :--- | | 1. Catalonia | Spain | | 2. Crimea | Hungary | | 3. Mindanao | Philippines | | 4. Oromia | Nigeria | Which of the pairs given above are correctly matched?