Topic Heat
Asked 3 times across 3 UPSC exams over 45 years (1979–2024), peaking in 1979.
Key insights
- Most tested in CSE — 1 of 3 PYQs
- Most asked in 1979
- Recurs across 3 years (1979–2024)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1979 → CDS 2018 → NDA 2024
How the concept evolved
Rising — more than half its appearances (2 of 3) 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.
NDA2024
Which one of the following statements best defines the concept of heat ?
- A The transformation of energy from one form to another
- B The conversion of energy into mass and vice-versa due to temperature difference
- C The transfer of energy due to temperature difference ✓
- D The change in volume of a substance with temperature
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
CDS2018
Which one of the following can extinguish fire more quickly?
- A Cold water
- B Boiling water ✓
- C Hot water
- D Ice
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
CSE1979
The water in an open pond remains cool even in hot summer because
- A Of continuous evaporation of water ✓
- B Water radiates heat more rapidly than the atmosphere
- C Water absorbs heat less rapidly than the atmosphere
- D Water absorbs heat more rapidly than the atmosphere
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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