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Topic Evaporation
Asked 7 times across 4 UPSC exams over 46 years (1979–2025), peaking in 2019.
Key insights
- Most tested in CSE — 2 of 7 PYQs
- Most asked in 2019
- Recurs across 6 years (1979–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1979 → CAPF 2016 → CDS 2019 → GEO 2025
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.
GEO2025
The rate of evaporation of a liquid decreases with an increase in
- A surface area
- B humidity
- C temperature ✓
- D wind speed
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
CDS2019
The rate of evaporation of liquid does not depend upon
- A temperature
- B its surface area exposed to the atmosphere
- C its mass
- D humidity ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
CDS2019
Rate of evaporation increases with
- A an increase of surface area
- B an increase in humidity
- C a decrease in wind speed ✓
- D a decrease of temperature
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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