NEET UG 2021 · Physics · Question 33
NEET 2021 Physics, question 33
Question 33 of the NEET 2021 paper (code O1) is a Physics question from Nuclei. Its idea, Fraction Remaining After n Half-lives, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 4.
Updated 2026-10-08
Q33 · Physics
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :
- 1
- 2
- 31/2
- 4Official answer
Official answer: option 4 · NTA final answer key
Same idea
The only question on Fraction Remaining After n Half-lives
No other NEET paper from 2017–2026 tested this exact idea.
Fraction Remaining After n Half-lives: every question and how it was framed
The chapter
Nuclei in ten years of NEET
13 questions from 2017–2026, asked in 9 of 10 papers, about 1.2 a paper. Radioactive Decay alone had 9.