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GS Paper IUPSC Prelims 2001
Health & Medicine
Question No. 305Interactive Test Mode
00:00
+2-0.66

Q305. Which one of the following is NOT radioactive?

Which one of the following is NOT radioactive?

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 2001 • Science and Technology

Correct Answer: Option (D) — Zirconium

Concept & Option Breakdown

Standard Reference Verified
  • Zirconium (Zr, atomic number 40) is a stable transition metal widely used in nuclear reactor cladding due to its corrosion resistance and low thermal neutron absorption.
  • Astatine (At) is an intensely radioactive halogen with only short-lived isotopes.
  • Francium (Fr) is an extremely radioactive alkali metal.
  • Tritium (³H) is a radioactive beta-emitting isotope of hydrogen with a half-life of ~12.3 years.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2001 (Q305)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — Zirconium

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Frequently Asked Questions — UPSC Prelims 2001 Q305

What is the official answer for UPSC Prelims 2001 GS Paper I Question 305 (Science and Technology)?

The official UPSC answer key for this 2001 Science and Technology (Health & Medicine) question is Option (D): "Zirconium". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2001 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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