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Topic Wave propagation
Asked 2 times across 2 UPSC exams over 38 years (1980–2018), peaking in 1980.
Key insights
- Most tested in CSE — 1 of 2 PYQs
- Most asked in 1980
- Recurs across 2 years (1980–2018)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1980 → CDS 2018
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.
CDS2018
Sound waves cannot travel through a
- A copper wire placed in air
- B silver slab placed in air
- C glass prism placed in water
- D wooden hollow pipe placed in vacuum ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
CSE1980
Range of Television Broadcasting is confined to a limited distance because
- A Long waves are used
- B Short waves are absorbed by atmosphere
- C Energy of the waves is dissipated
- D Earth is spherical in shape ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
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