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GS Paper IUPSC Prelims 2023
Pollution & Environmental Laws
Question No. 63Interactive Test Mode
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+2-0.66

Q63. Consider the following: 1. Aerosols 2. Foam agents 3. Fire retardants 4. Lubricants In the making of how many of the above are hydrofluorocarbons used?

Consider the following:

  1. Aerosols
  2. Foam agents
  3. Fire retardants
  4. Lubricants

In the making of how many of the above are hydrofluorocarbons used?

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2023 • Environment and Ecology

Correct Answer: Option (C) — Only three

Concept & Option Breakdown

Standard Reference Verified

Hydrofluorocarbons (HFCs) were introduced as replacements for ozone-depleting substances like CFCs and HCFCs. They are widely used as:

  1. Propellants in aerosols
  2. Blowing agents in foam manufacturing
  3. Fire suppressants/retardants Lubricants typically utilize petroleum oils or synthetic esters, not HFCs. Hence, HFCs are used in three of the given applications.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2023 (Q63)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicEnvironment and Ecology → Pollution & Environmental Laws
Official Answer KeyOption (C) — Only three

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Frequently Asked Questions — UPSC Prelims 2023 Q63

What is the official answer for UPSC Prelims 2023 GS Paper I Question 63 (Environment and Ecology)?

The official UPSC answer key for this 2023 Environment and Ecology (Pollution & Environmental Laws) question is Option (C): "Only three". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2023 question belong to?

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

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

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