Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2021
Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire?
- A Calcium
- B Sodium ✓
- C Vanadium
- D Magnesium
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
CDS2015
Sodium metal should be stored in
- A Alcohol
- B Kerosene oil ✓
- C Water
- D Hydrochloric acid
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
Study how UPSC repeats — not just the papers
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① Cross-exam learning — see the same idea recur across CSE, CAPF, CDS and NDA.
② Topic evolution — how each idea is framed, year by year.
③ Question intelligence — every PYQ + answer, linked to related concepts and similar questions.
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