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Topic

SI units

Asked 2 times across 2 UPSC exams over 1 years (2025–2026), peaking in 2025.
2
PYQs
2
Exams
2
Years active
2025–2026
Span
2025
Peak
1/2
Answers
📅 Full chronological timeline →

Key insights

  • Most tested in NDA — 1 of 2 PYQs
  • Most asked in 2025
  • Recurs across 2 years (2025–2026)

How it travelled across exams

First appearance in each exam — the same idea, reframed.
NDA 2025 → GEO 2026

How the concept evolved

125
126
Rising — more than half its appearances (2 of 2) are since 2016.

Sample questions

You've seen the pattern — here are a few of the actual PYQs.
GEO2026
Which of the following constants are necessarily included in defining the seven fundamental base units?
  1. A c, G, h
  2. B e, c, α
  3. C e, c, h
  4. D N_A, k, G
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
NDA2025

Match List I with List II and select the answer using the code given below the Lists

List I (Physical Quantity)List II (SI Unit)
A. Temperature1. Kelvin
B. Weight2. Kilogram
C. Mass3. Pascal
D. Pressure4. Newton

Codes:

  1. A A-1 B-2 C-4 D-3
  2. B A-3 B-4 C-2 D-1
  3. C A-1 B-4 C-2 D-3 ✓
  4. D A-3 B-2 C-4 D-1
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry

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