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UPSC 2001: Match List I with List II and select the correct answer using the codes given below the Lists: List I (Characteristic) I. Zero mass II. Fractional charge III. Fractional spin IV. Integral spin List II (Particle) A) Positron B) Neutrino C) Quark D) Phonon
(a)I-B, II-C, III-A, IV-D
(b)I-C, II-B, III-D, IV-A
(c)I-B, II-C, III-D, IV-A
(d)I-C, II-B, III-A, IV-D
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Not attemptedCorrect Answer: (a) I-B, II-C, III-A, IV-D
Neutrino is (effectively) zero-mass ⇒ I-B; quarks carry ±⅓ e or ±⅔ e fractional charge ⇒ II-C; positron (like the electron) has spin ½, a fractional (half-integer) value ⇒ III-A; phonon is a bosonic lattice excitation with spin 0 (integral) ⇒ IV-D. Code (I-B, II-C, III-A, IV-D) corresponds to option (a). ([examrobot.com](https://examrobot.com/content/match-list-i-list-ii-and-select-correct-answer-using-codes-given-below-lists-75?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Science & Technology question?▼
The correct answer is option (a): I-B, II-C, III-A, IV-D. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 107. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.