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GS Paper IUPSC Prelims 2004
Health & Medicine
Question No. 351Interactive Test Mode
00:00
+2-0.66

Q351. Match List-I (Fuel gases) with List-II (Major constituents) and select the correct answer using the codes given below the lists: | List-I | List-II | | :--- | :--- | | A. CNG | 1. Carbon monoxide, Hydrogen | | B. Coal gas | 2. Butane, Propane | | C. LPG | 3. Methane, Ethane | | D. Water gas | 4. Hydrogen, Methane, Carbon monoxide | Codes:

Match List-I (Fuel gases) with List-II (Major constituents) and select the correct answer using the codes given below the lists:

List-IList-II
A. CNG1. Carbon monoxide, Hydrogen
B. Coal gas2. Butane, Propane
C. LPG3. Methane, Ethane
D. Water gas4. Hydrogen, Methane, Carbon monoxide

Codes:

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 2004 • Science and Technology

Correct Answer: Option (B) — A-3; B-4; C-2; D-1

Concept & Option Breakdown

Standard Reference Verified
  • CNG (Compressed Natural Gas) primarily consists of Methane and small amounts of Ethane (A-3).
  • Coal gas is composed of Hydrogen, Methane, and Carbon monoxide (B-4).
  • LPG (Liquefied Petroleum Gas) consists of Butane and Propane (C-2).
  • Water gas is an equimolar mixture of Carbon monoxide and Hydrogen ($CO + H_2$) (D-1).
Elimination Heuristic & Exam Approach

Water gas is universally defined as $CO + H_2$ (D-1), and LPG is Butane + Propane (C-2). Matching these pairs gives option (b) instantly.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2004 (Q351)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — A-3; B-4; C-2; D-1

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Frequently Asked Questions — UPSC Prelims 2004 Q351

What is the official answer for UPSC Prelims 2004 GS Paper I Question 351 (Science and Technology)?

The official UPSC answer key for this 2004 Science and Technology (Health & Medicine) question is Option (B): "A-3; B-4; C-2; D-1". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2004 question belong to?

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

Water gas is universally defined as $CO + H2$ (D1), and LPG is Butane + Propane (C2). Matching these pairs gives option (b) instantly.

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