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Question No. 116Interactive Test Mode
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Q116. Consider the following which can be found in the ambient atmosphere: 1. Soot 2. Sulphur hexafluoride 3. Water vapour Which of the above contribute to the warming up of the atmosphere?

Consider the following which can be found in the ambient atmosphere:

  1. Soot
  2. Sulphur hexafluoride
  3. Water vapour

Which of the above contribute to the warming up of the atmosphere?

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 2010 • Environment and Ecology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified
  • 1. Soot (Black Carbon): Absorbs incoming solar radiation directly in the atmosphere and reduces surface albedo when deposited on snow and ice, causing net warming.
  • 2. Sulphur Hexafluoride (SF₆): An extremely potent synthetic greenhouse gas with a global warming potential (GWP) over 23,000 times that of CO₂ over a 100-year timescale.
  • 3. Water Vapour: The most abundant greenhouse gas naturally present, responsible for amplifying atmospheric warming through positive climate feedback loops.

All three contribute to atmospheric warming.

Elimination Heuristic & Exam Approach

Water vapour is the primary natural greenhouse gas, SF₆ is one of the Kyoto greenhouse gases, and black carbon/soot is a well-known short-lived climate pollutant.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2010 (Q116)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Climate Change & Global Warming
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 2010 Q116

What is the official answer for UPSC Prelims 2010 GS Paper I Question 116 (Environment and Ecology)?

The official UPSC answer key for this 2010 Environment and Ecology (Climate Change & Global Warming) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2010 question belong to?

This question belongs to GS Paper I under the subject "Environment and Ecology" and micro-topic "Climate Change & Global Warming". You can explore all repeated questions from Climate Change & Global Warming 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 Climate Change & Global Warming UPSC Prelims question using option elimination?

Water vapour is the primary natural greenhouse gas, SF₆ is one of the Kyoto greenhouse gases, and black carbon/soot is a wellknown shortlived climate pollutant.

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