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Topic Cloud seeding
Asked 2 times across 2 UPSC exams over 11 years (2014–2025), peaking in 2025.
Key insights
- Most tested in CSE — 1 of 2 PYQs
- First appeared in CDS 2014 — 11 years before CSE 2025 (allied exams preview CSE)
- Most asked in 2025
- Recurs across 2 years (2014–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2014 → CSE 2025
How the concept evolved
Long-running — most appearances (1 of 2) predate 2016, and it still returns.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CSE2025
Artificial way of causing rainfall to reduce air pollution makes use of
- A silver iodide and potassium iodide ✓
- B silver nitrate and potassium iodide
- C silver iodide and potassium nitrate
- D silver nitrate and potassium chloride
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CDS2014
The technique of inducing rain from cloud is called
- A Cloud computing
- B Cloud control
- C Cloud engineering
- D Cloud seeding ✓
✓ Correct answer: (D)
Geography › Climatology
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