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GS Paper IUPSC Prelims 2003
Health & Medicine
Question No. 302Interactive Test Mode
00:00
+2-0.66

Q302. Which one of the following statements is correct?

Which one of the following statements is correct?

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 2003 • Science and Technology

Correct Answer: Option (A) — Liquid sodium is employed as a coolant in nuclear reactors.

Concept & Option Breakdown

Standard Reference Verified
  • Option (a) is correct: Liquid sodium possesses high thermal conductivity, a wide liquid range, and low neutron capture cross-section, making it an ideal coolant in Fast Breeder Reactors (FBRs).
  • Option (b) is incorrect: While calcium carbonate can act as a mild abrasive in some pastes, standard formulations use various abrasives (silica, hydrated alumina), and it is not uniquely definitive compared to the direct application in (a).
  • Option (c) is incorrect: Bordeaux mixture is an effective fungicide composed of copper(II) sulfate (CuSO₄) and slaked lime (calcium hydroxide, Ca(OH)₂), not sodium sulphate.
  • Option (d) is incorrect: Dental amalgams are alloys of mercury with silver, tin, and copper; zinc amalgams are used chemically as reducing agents (e.g., Clemmensen reduction), not for dental fillings.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2003 (Q302)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — Liquid sodium is employed as a coolant in nuclear reactors.

Related & Repeated Prelims PYQs (1)

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2003 • Q32382% Match

Which one of the following statements is NOT correct?

Science and Technology • Health & MedicineSolve

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Frequently Asked Questions — UPSC Prelims 2003 Q302

What is the official answer for UPSC Prelims 2003 GS Paper I Question 302 (Science and Technology)?

The official UPSC answer key for this 2003 Science and Technology (Health & Medicine) question is Option (A): "Liquid sodium is employed as a coolant in nuclear reactors.". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2003 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?

To solve Health & Medicine 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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