Home / Topic / Anomalous expansion of water
Topic Anomalous expansion of water
Asked 7 times across 4 UPSC exams over 44 years (1981–2025), peaking in 1981.
Key insights
- Most tested in CSE — 4 of 7 PYQs
- Most asked in 1981
- Recurs across 6 years (1981–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1981 → CDS 2022 → NDA 2024 → GEO 2025
How the concept evolved
Long-running — most appearances (4 of 7) predate 2016, and it still returns.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
GEO2025
Water has its maximum density at which one of the following temperatures?
- A 273 K
- B 277 K ✓
- C 373 K
- D 298 K
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
NDA2024
At which temperature does liquid water show maximum density ?
- A 299 K
- B 277 K ✓
- C 285 K
- D 373 K
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
CDS2022
When water is heated from 0°C to 4°C, its density
- A remains constant.
- B increases. ✓
- C decreases.
- D first increases then decreases to its original value.
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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