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GS Paper IUPSC Prelims 1998
Health & Medicine
Question No. 356Interactive Test Mode
00:00
+2-0.66

Q356. Consider the following statements about acetylene: 1. It is used in the welding industry. 2. It is a raw material for preparing plastics. 3. It is easily obtained by mixing silicon carbide and water Of these statements.

Consider the following statements about acetylene:

  1. It is used in the welding industry.
  2. It is a raw material for preparing plastics.
  3. It is easily obtained by mixing silicon carbide and water Of these statements.
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 1998 • Science and Technology

Correct Answer: Option (A) — 1 and 2 are correct

Concept & Option Breakdown

Standard Reference Verified
  • Statement 1 is correct: Acetylene is used in oxyacetylene welding and cutting torches due to the extremely high flame temperatures produced (~3200°C).
  • Statement 2 is correct: Acetylene is a precursor used in polymer synthesis (PVC, polyacetylene, acrylics).
  • Statement 3 is incorrect: Acetylene is produced by the reaction of calcium carbide ($CaC_2$) with water ($CaC_2 + 2H_2O \rightarrow C_2H_2 + Ca(OH)_2$), not silicon carbide ($SiC$).
Elimination Heuristic & Exam Approach

Silicon carbide ($SiC$) is carborundum, an extremely hard abrasive chemically inert to water. Acetylene comes from calcium carbide ($CaC_2$). Thus statement 3 is false.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1998 (Q356)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — 1 and 2 are correct

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Frequently Asked Questions — UPSC Prelims 1998 Q356

What is the official answer for UPSC Prelims 1998 GS Paper I Question 356 (Science and Technology)?

The official UPSC answer key for this 1998 Science and Technology (Health & Medicine) question is Option (A): "1 and 2 are correct". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1998 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?

Silicon carbide ($SiC$) is carborundum, an extremely hard abrasive chemically inert to water. Acetylene comes from calcium carbide ($CaC2$). Thus statement 3 is false.

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