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Topic Energy Conversion
Asked 2 times across 2 UPSC exams over 3 years (2018–2021), peaking in 2018.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2018
- Recurs across 2 years (2018–2021)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2018 → CISF 2021
How the concept evolved
Rising — more than half its appearances (2 of 2) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CISF2021
An electric generator primarily converts
- A electrical energy to heat energy.
- B electrical energy to sound energy.
- C electrical energy to mechanical energy.
- D mechanical energy to electrical energy. ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
CDS2018
Which one of the following does not convert electrical energy into light energy?
- A A candle ✓
- B A light-emitting diode
- C A laser
- D A television set
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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