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Physics - Nuclear Physics

Practise 61 COMEDK previous year questions on Nuclear Physics, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

Nuclear Physics has been asked in 15 of the 15 years of COMEDK papers analysed (2012–2026), with 61 questions in all. 56% of them were easy, 39% moderate and 5% tough. Most of its questions came from 2025, with 13 questions that year. In the last three years (2024–2026) it had 26 questions across 9 papers, about 2.9 per paper.

The chapter's 4 topics are not weighted equally: Nuclear structure (18 questions, 30%), Nuclear energy (17 questions, 28%), and Radioactivity (14 questions, 23%) have been asked the most. Over the last five years the most frequent topics have been Nuclear energy (14), Nuclear structure (11), and Nuclear reactions (5). Radioactivity has produced the most tough questions (3).

  1. 1Two deuterons are fused to form one alpha particle. If binding energy per nucleon of deuterium is 1.05 MeV and that of alpha particle is 7 M09 May, 2026 (S1)Nuclear energy
  2. 2A nucleus of uranium-235 absorbs a slow neutron and undergoes nuclear fission according to the reaction: If the average energy released per 09 May, 2026 (S1)Nuclear reactions
  3. 3A mercury-198 nucleus is bombarded by a neutron, which causes a nuclear reaction What is the unknown product particle X?09 May, 2026 (S1)Nuclear reactions
  4. 4The main function of cadmium used in the nuclear reactor is:09 May, 2026 (S2)Nuclear reactions
  5. 5The atomic mass of an element is 19.98170 amu. The binding energy per nucleon of that element is: [given mass of neutron = 1.00867 amu and m09 May, 2026 (S2)Nuclear energy
  6. 6If the ratio of the nuclear radii of two atoms is 2:3 then the ratio of their mass numbers is:09 May, 2026 (S2)Nuclear structure
  7. 7When a nitrogen-14 nucleus is bombarded by a deuteron, the products formed are:25 May, 2025 (Shift)Nuclear reactions
  8. 8In a deuterium-tritium fusion reaction given by the mass defect is given as 0.0188 u . The total energy released in the fusion reaction is:25 May, 2025 (Shift)Nuclear energy
  9. 9In a nuclear reaction , what is the total energy released if the binding energy of beryllium -9 is 58.2 MeV and that of boron- 10 is 64.7 Me25 May, 2025 (Shift)Nuclear energy
  10. 10If the binding energy per nucleon in and nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of p in the reaction is10 May, 2025 (S1)Nuclear energy
  11. 11In a nuclear fusion reaction, two nuclei, and fuse to produce a nucleus , releasing an amount of energy in the process. If the mass defects 10 May, 2025 (S1)Nuclear energy
  12. 12The nuclear forces a. are central forces, independent of the spin of the nucleons. b. have a short-range dominant over a distance of about a10 May, 2025 (S1)Nuclear structure
  13. 13Fusion reaction is more energetic than fission reaction because10 May, 2025 (S2)Nuclear energy
  14. 14The nucleus of oxygen atom contains 8 protons and 8 neutrons. What is the mass defect in amu? [Given Mass of proton amu Mass of neutron and 10 May, 2025 (S2)Nuclear energy
  15. 15To get 300 MW electric power for half an hour, how much mass is to be completely converted into energy?10 May, 2025 (S2)Nuclear energy
  16. 16When nuclei are bombarded by neutrons, one of the resultant nuclei is . Then the emitted particle will be:10 May, 2025 (S3)Nuclear reactions
  17. 17Radium having mass number 200 and binding energy per nucleon 5.6 MeV , splits into two fragments Cadmium of mass number 112 and Hassium of m10 May, 2025 (S3)Nuclear energy
  18. 18If the mass numbers of two nuclei are in the ratio \(5: 2\) and their diameters are in ratio \(2: 6\), Then their nuclear densities will be 10 May, 2025 (S3)Nuclear structure
  19. 19Select the correct statement from the following:10 May, 2025 (S3)Nuclear structure
  20. 20A nucleus with mass number 190 initially at rest emits an alpha particle. If the value of the reaction is , the kinetic energy of the alpha 2024 (Afternoon Shift)Nuclear energy
  21. 21The radius of a nucleus as measured by electron scattering is . The mass number of nucleus is most likely to be2024 (Afternoon Shift)Nuclear structure
  22. 22Preview not available - open to view this question.2024 (Evening Shift)Nuclear structure
  23. 23The binding energy per nucleon for is and that for is . The energy required to remove a neutron from is2024 (Evening Shift)Nuclear energy
  24. 24The closest approach of an alpha particle when it make a head on collision with a gold nucleus is , then the kinetic energy of the alpha par2024 (Morning Shift)Nuclear structure
  25. 25The ratio of the radii of the nucleus of two element and having the mass numbers 232 and 29 is:2024 (Morning Shift)Nuclear structure
  26. 26Find the binding energy of the tritium nucleus: [Given: mass of .]2024 (Morning Shift)Nuclear energy
  27. 27Which of the following statement is true when a gamma decay occurs from the nucleus of an atom?2023 (Evening Shift)Radioactivity
  28. 28In a nuclear reaction 2 deuteron nuclei combine to form a helium nucleus. The energy released in will be: (Given mass of deuteron . and mass2023 (Evening Shift)Nuclear energy
  29. 29The mass number of two nuclei and are 27 and 125 respectively. The ratio of their radii is given by:2023 (Evening Shift)Nuclear structure
  30. 30The mass density of a nucleus varies with mass number as2023 (Memory Based)Nuclear structure
  31. 31The mass density of a nucleus varies with mass number as2023 (Morning Shift)Nuclear structure
  32. 32During -decay, atomic mass of parent nuclei is2022Radioactivity
  33. 33Ba-122 has half-life of . Experiment has to be done using and it takes 10 min to set up the experiment. It initially at was taken, how much 2021Radioactivity
  34. 34When the speed of light becomes of its present value, the energy released in a given atomic explosion would:2021Nuclear energy
  35. 35Which of the following technique is not used for measuring small time intervals?2021Radioactivity
  36. 36Two radioactive materials and have decay constant and , respectively. If initially they have the same number of nuclei, then the ratio of th2020Radioactivity
  37. 37If is the atomic mass and is the mass number, packing fraction is given by2019Nuclear structure
  38. 38A count rate meter shows a count of 240 per min from a given radioactive source. One hour later the meter shows a count rate of 30 per min. 2019Radioactivity
  39. 39Heavy water is2019Nuclear reactions
  40. 40The nuclear reactor at Kaiga is a2019Nuclear reactions
  41. 41Two protons are kept at a separation of is the nuclear force and is the electrostatic force between them. Then,2018Nuclear structure
  42. 42The ratio of the nuclear radii of elements with mass numbers 216 and 125 is2018Nuclear structure
  43. 43On bombarding by slow neutron, energy is release(d)If the power output of atomic reactor is , then the rate of fission will be2018Nuclear reactions
  44. 44The masses of two radioactive substances are same and their half-lives are 1 year and 2 years, respectively. The ratio of their activities a2018Radioactivity
  45. 45undergoes successive disintegrations with the end product of . The number of and particles emitted are2018Radioactivity
  46. 46The most stable particle in Baryon group is2018Nuclear structure
  47. 47Two nucleons are at a separation of one Fermi. Protons have a charge of . The net nuclear force between them is , if both are neutrons, if b2017Nuclear structure
  48. 48Mean life of a radioactive sample is . Then, its half-life (in min) is2017Radioactivity
  49. 49Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. ihe other w2017Radioactivity
  50. 50th of a radioactive sample disintegrates in . Mean life of radioactive sample is approximately2016Radioactivity

Frequently Asked Questions

1.How many questions are available for Nuclear Physics?

This chapter includes 61 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the Nuclear Physics chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Nuclear Physics an important chapter for COMEDK Physics?

Nuclear Physics has appeared in 15 of the 15 years of COMEDK papers covered here, with 61 questions across 23 papers - about 3 per paper it appears in.

4.What is the difficulty level of Nuclear Physics questions in COMEDK?

Of the 61 questions analysed for this chapter, 56% are easy, 39% moderate and 5% tough. 2025 had the most, with 13 questions.

5.Which topics in Nuclear Physics should I focus on?

These topics have carried the most weightage in Nuclear Physics:

  • Nuclear structure - 18 questions (30%)
  • Nuclear energy - 17 questions (28%)
  • Radioactivity - 14 questions (23%)
  • Radioactivity has produced the most tough questions (3).
6.Is Nuclear Physics's weightage in COMEDK going up or down?

Across all 23 papers analysed, Nuclear Physics has averaged about 2.7 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.9 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.