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Topic Sublimation
Asked 7 times across 6 UPSC exams over 45 years (1981–2026), peaking in 2022.
Key insights
- Most tested in CSE — 2 of 7 PYQs
- Most asked in 2022
- Recurs across 6 years (1981–2026)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1981 → CAPF 2016 → CDS 2020 → NDA 2022 → CISF 2022 → GEO 2026
How the concept evolved
Rising — more than half its appearances (5 of 7) are since 2016.
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.
GEO2026
The conversion of naphthalene into naphthalene vapours is called
- A distillation
- B sublimation
- C crystallization
- D decomposition
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
NDA2022
Dry ice is used on a performing stage to produce mist in air. The process involved is an example of
- A sublimation ✓
- B evaporation
- C condensation
- D precipitation
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CISF2022
Which one of the following substances shows sublimation behaviour or property at standard temperature and pressure ?
- A Solid carbon dioxide ✓
- B Water
- C Liquid nitrogen
- D Iron
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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