Atoms and Nuclei is a Class 12 chapter in the Physics section of the MHT CET for candidates who are preparing for the PCM (Physics, Chemistry, and Mathematics).
The key topics covered in Atoms and Nuclei PYQs are:
- Bohr's model of the hydrogen atom and its spectrum
- Energy levels, ionisation energy and spectral lines
- Radioactivity, half-life and activity
- Nuclear size, density and mass number
- Binding energy, mass defect, fission and fusion
Practising Atoms and Nuclei MHT CET PYQ helps candidates to understand question pattern, improve calculation speed, and identify concepts which were asked in previous exams.
Based on chapter-wise analysis of the MHT CET Physics paper, you can get about 2 marks per paper by covering Atoms and Nuclei. The chapter recorded 177 questions across the 80 shifts in the data, and 72 of them came in the 2025 and 2026 papers, where it contributed about 4.4% per shift.
MHT CET Atoms and Nuclei Chapter: Question Count, Marks and Weightage:
| 2.15 Average questions per shift (2018-2026) | 72 Questions in the 2025 and 2026 papers (33 shifts) |
| 177 Questions in the PDF (2016-2026) | 4.3% Estimated Physics paper weightage (4.4% in 2025-2026) |
The PDF holds 177 questions from MHT CET 2026 to 2016, newest first, each with its exam date and shift. Options are as printed and answer keys are not included.
Atoms and Nuclei PYQ Statistics (2022-2026)
The table below shows the number of questions asked in MHT CET Atoms and Nuclei PYQs. Every shift has 50 Physics questions, so the last column is the average per shift divided by 50.
| Year | Total Questions (across shifts) | Shifts in the Data | Average per Shift | Weightage (out of 50 Physics Qs) |
|---|---|---|---|---|
| 2026 | 38 | 16 | 2.38 | 4.8% |
| 2025 | 34 | 17 | 2.00 | 4.0% |
| 2024 | 39 | 18 | 2.17 | 4.3% |
| 2023 | 26 | 12 | 2.17 | 4.3% |
| 2022 | 2 | 1 | 2.00 | 4.0% |
The 2018 to 2021 papers in the PDF add 33 more questions: 2021 had 18, 2020 had 7, 2019 had 7, 2018 had 1; the papers before 2018 add 3 from 2017, 2 from 2016.
MHT CET Atoms and Nuclei Important Questions: Based on the Last 5 Years
The major types of questions asked from Atoms and Nuclei in MHT CET cover the following topics:
| Topic | Questions in the PDF | Questions in 2022-2026 | Average per Shift (2022-2026) |
|---|---|---|---|
| Radioactive decay, half-life and activity | 32 | 27 | 0.42 |
| Bohr model, hydrogen spectrum and energy levels | 139 | 107 | 1.67 |
| Nuclear size, binding energy, fission and fusion | 5 | 4 | 0.06 |
| Other atomic and nuclear questions | 1 | 1 | 0.02 |
Pair PYQs with Other Study Material for MHT CET 2027
Click on the link to practise problems and time management skills:
| Resource | Link |
|---|---|
| MHT CET Sample Paper | Check Here |
| MHT CET Mock Test | Check Here |
Question Style in MHT CET Atoms and Nuclei PYQs
Every question in this PDF is a single-correct MCQ. Bohr's model and the hydrogen spectrum form the largest group, followed by radioactivity.
| Question Style | What it Tests |
|---|---|
| Bohr's model | The kinetic energy of the electron in an orbit of radius r, and which quantity is an integral multiple of h/2π in Bohr's model |
| Hydrogen spectrum | The wavelength emitted when the electron in a hydrogen atom jumps from the nth state to the ground state |
| Radioactive decay | The activity of a sample that falls to a fraction of its value in 4 days and its value after 16 days, and the fraction decayed in a given number of half-lives |
| Nuclear size and density | The ratio of the densities of the oxygen and helium nuclei, and the ratio of the radii of nuclei of mass numbers 27 and 125 |
| Nuclear reactions | The particle X in a β⁺ decay reaction, and the binding energy from the mass of an oxygen isotope and the masses of the proton and neutron |
How to Use the Atoms and Nuclei PYQ PDF for MHT CET
- Start with the 2025 and 2026 papers first, because they hold 72 of the 177 questions.
- Learn the Bohr formulas: r ∝ n²/Z, E ∝ -Z²/n² and the Rydberg formula for the spectral lines.
- For decay questions, write N = N₀(1/2)^(t/T) first and then read off the fraction that remains or has decayed.
- Solve year-wise PYQs by timing yourself, as time management is crucial.
- Re-attempt only the questions you got wrong, and note which formula or step you missed.
Video: Atoms and Nuclei PYQs and MCQs
Source: Physics Paathshaala
Atoms and Nuclei PYQ for MHT CET Physics FAQs
Ques. How many questions come from Atoms and Nuclei every year?
Ans. In this PDF, the questions are 38 from 2026, 34 from 2025, 39 from 2024, 26 from 2023 and 2 from 2022 and the rest from earlier papers. In 2025 and 2026 together the chapter had 72 questions across 33 shifts, about 2.18 per shift.
Ques. Which topics are asked most frequently in MHT CET Atoms and Nuclei?
Ans. Bohr model, hydrogen spectrum and energy levels is the largest group with 139 of the 177 questions, about 79%.
Ques. What kind of questions are asked from Atoms and Nuclei?
Ans. Single-correct MCQs, mostly numerical. Common ones ask for the energy or wavelength in a hydrogen transition, the activity or fraction left after a given time, or the ratio of nuclear radii or densities.
Ques. What is the best way to practise Atoms and Nuclei PYQs?
Ans. First solve the 2025 and 2026 questions completely, then the older ones, and finally re-attempt the questions you got wrong.
Ques. Can I score full marks from Atoms and Nuclei?
Ans. In 2025 and 2026 together the chapter had 72 questions across 33 shifts. Learning the Bohr model formulas and the decay law is enough to secure it. Each Physics question in MHT CET is worth 1 mark.
Ques. Does the Atoms and Nuclei PYQ PDF include solutions?
Ans. No. The PDF contains the questions with their exam date and shift, without answer keys or solutions.
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