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GS Paper IUPSC Prelims 2001
Health & Medicine
Question No. 306Interactive Test Mode
00:00
+2-0.66

Q306. Match List I with List II and select the correct answer using the codes given below the lists: | List-I (Characteristic) | List-II (Particle) | | :--- | :--- | | A. Zero mass | 1. Positron | | B. Fractional charge | 2. Neutrino | | C. Fractional spin | 3. Quark | | D. Integral spin | 4. Photon |

Match List I with List II and select the correct answer using the codes given below the lists:

List-I (Characteristic)List-II (Particle)
A. Zero mass1. Positron
B. Fractional charge2. Neutrino
C. Fractional spin3. Quark
D. Integral spin4. Photon
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 (A) — A-2; B-3; C-1; D-4

Concept & Option Breakdown

Standard Reference Verified
  • A matches 2: Neutrinos have nearly zero rest mass (classically treated as having zero rest mass).
  • B matches 3: Quarks possess fractional elementary electric charges (+2/3e or -1/3e).
  • C matches 1: Positrons are fermions with half-integral (fractional) spin (1/2).
  • D matches 4: Photons are gauge bosons carrying an integral spin of 1.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2001 (Q306)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (A) — A-2; B-3; C-1; D-4

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Frequently Asked Questions — UPSC Prelims 2001 Q306

What is the official answer for UPSC Prelims 2001 GS Paper I Question 306 (Science and Technology)?

The official UPSC answer key for this 2001 Science and Technology (Health & Medicine) question is Option (A): "A-2; B-3; C-1; D-4". 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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