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Topic Conservation laws
Asked 4 times across 2 UPSC exams over 10 years (2015–2025), peaking in 2025.
Key insights
- Most tested in CDS — 3 of 4 PYQs
- Most asked in 2025
- Recurs across 4 years (2015–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2015 → NDA 2021
How the concept evolved
Rising — more than half its appearances (3 of 4) are since 2016.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2025
The linear momentum of a particle is conserved if :
- A the net force on it is maximum.
- B the net force on it is zero.
- C the net torque on it is zero.
- D the net work done on it is maximum.
Answer key not yet available (pending official release)
Science & Technology › Physics & Chemistry
NDA2021
Fundamental laws of physics require
- A conservation of energy and non-conservation of charge.
- B conservation of charge and non-conservation of linear momentum.
- C conservation of charge and non-conservation of energy.
- D conservation of energy, momentum and charge. ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
CDS2018
Consider the following statements
- There is no net moment on a body which is in equilibrium
- The momentum of a body is always conserved
- The kinetic energy of an object is always conserved
Which of the statements given above is/are correct?
- A 1, 2 and 3
- B 2 and 3 only
- C 1 and 2 only ✓
- D 1 only
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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