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Topic Dimensional analysis
Asked 5 times across 3 UPSC exams over 9 years (2016–2025), peaking in 2023.
Key insights
- Most tested in NDA — 2 of 5 PYQs
- Most asked in 2023
- Recurs across 4 years (2016–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2016 → NDA 2021 → GEO 2023
How the concept evolved
Rising — more than half its appearances (5 of 5) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
NDA2025
Which one of the following is dimensionless quantity?
- A Stress
- B Strain ✓
- C Pressure
- D Force
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
GEO2023
Which one of the following quantities is dimensionless?
- A Specific weight
- B Specific heat
- C Specific density
- D Specific gravity ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
GEO2023
Which one of the following expressions has dimensions of energy (here V is the voltage across a resistor of resistance R and I is the current through the resistor, and t is the time)?
- A (V²/I)t
- B (V²/R)t ✓
- C (I²/R)t
- D (I²/V)t
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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