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Person Niels Bohr
Asked 2 times across 2 UPSC exams over 10 years (2014–2024), peaking in 2014.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2014
- Recurs across 2 years (2014–2024)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2014 → NDA 2024
How the concept evolved
Long-running — most appearances (1 of 2) predate 2016, and it still returns.
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 scientists mentioned that an electron in an atom could revolve in certain stable orbits without the emission of radiant energy?
- A Ernest Rutherford
- B J.J. Thomson
- C Niels Bohr ✓
- D Albert Einstein
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
CDS2014
The distribution of electrons into different orbits of an atom, as suggested by Bohr, is
- A 2 electrons in the K-orbit, 6 electrons in the L-orbit, 18 electrons in the M-orbit
- B 2 electrons in the K-orbit, 8 electrons in the L-orbit, 32 electrons in the M-orbit
- C 2 electrons in the K-orbit, 8 electrons in the L-orbit, 18 electrons in the M-orbit ✓
- D 2 electrons in the K-orbit, 8 electrons in the L-orbit, 16 electrons in the M-orbit
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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