MDCAT Physics — Nuclear Physics
Nuclear Physics is a core Physics topic in the PMDC MDCAT syllabus, covering 6 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (6)
- Biological and Medical Uses of Radiation
- Composition of Atomic Nuclei
- Half-Life
- Half-life and Rate of Decay
- Radioactivity
- Spontaneous and Random Nuclear Decay
How Nuclear Physics is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Nuclear Physics accounts for 73 questions. It appears in all 16, about 4.6 questions a paper. The heaviest was MDCAT 2015, with 7 questions, and the most recent is MDCAT 2025, with 3.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 3 |
| MDCAT 2024 | 4 |
| MDCAT 2023 | 3 |
| MDCAT 2022 | 3 |
| MDCAT 2019 | 3 |
| MDCAT 2018 | 3 |
| MDCAT 2017 | 3 |
| MDCAT 2016 | 5 |
| MDCAT 2015 | 7 |
| MDCAT 2014 | 6 |
| MDCAT 2013 | 7 |
| MDCAT 2012 | 7 |
| MDCAT 2011 | 7 |
| MDCAT 2010 | 4 |
| MDCAT 2009 | 1 |
| MDCAT 2008 | 7 |
Nuclear Physics MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Nuclear Physics
After 3 half-lives, the remaining fraction of a radioactive sample is:
- A.1/2
- B.1/4
- C.1/8
- D.1/16
Show answer
Answer: C. 1/8 — After 3 half-lives, 1/8 of the original radioactive sample remains.
- Q2 · MDCAT 2024 · Nuclear Physics
The unit of decay constant is;
- A.m
- B.s
- C.s⁻¹
- D.m⁻¹
Show answer
Answer: C. s⁻¹ — The decay constant's unit is per second (s⁻¹).
- Q3 · MDCAT 2023 · Nuclear Physics
The SI unit of equivalent dose is:
- A.Gray
- B.Mass
- C.Rad
- D.Sievert
Show answer
Answer: D. Sievert — The SI unit of equivalent dose (radiation dose adjusted for biological effect) is the sievert.