Jump to a section

Physics - Nuclear Physics

Practise 64 KCET previous year questions on Nuclear Physics, compiled from papers spanning 2007 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty KCET tests.

Nuclear Physics has been asked in 19 of the 20 years of KCET papers analysed (2007–2026), with 64 questions in all. 58% of them were easy, 34% moderate and 8% tough. Most of its questions came from 2013, with 7 questions that year. In the last three years (2024–2026) it had 4 questions across 3 papers, about 1.3 per paper.

The chapter's 4 topics are not weighted equally: Radioactivity (32 questions, 50%), Nuclear energy (13 questions, 20%), and Nuclear structure (10 questions, 16%) have been asked the most. Radioactivity has also led over the last five years, with 3 questions. Radioactivity has produced the most tough questions (3).

  1. 1Match the following types of nuclei with examples shown2025Nuclear structure
  2. 2Which of the following statements is incorrect with reference of 'Nuclear force'?2025Nuclear structure
  3. 3Consider the nuclear fission reaction . Assuming all the kinetic energy is carried away by the fast neutrons only and total binding energies2024Nuclear energy
  4. 4The natural logarithm of the activity of a radioactive sample varies with time as shown. At , there are undecayed nuclei. Then, is equal to 2024Radioactivity
  5. 5A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to th of its initial value is abou2023Radioactivity
  6. 6In the following equation representing decay, the number of neutrons in the nucleus is2023Nuclear reactions
  7. 7A nucleus with mass number 220 initially at rest emits an alpha particle. If the value of reaction is . Calculate the value of kinetic energ2023Nuclear energy
  8. 8Binding energy of a nitrogen nucleus , given2022Nuclear energy
  9. 9Which of the following radiations is deflected by electric field ?2022Radioactivity
  10. 10A nuclear reactor delivers a power of , the amount of fuel consumed by the reactor in one hour is2022Nuclear reactions
  11. 11Which graph in the following diagram correctly represents the potential energy of a pair of nucleons as a function of their separation?2021Nuclear energy
  12. 12In a nuclear reactor heavy nuclei is not used as moderators because2021Nuclear reactions
  13. 13During a -decay2020Radioactivity
  14. 14A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years?2020Radioactivity
  15. 15Which one of the following nuclei has shorter mean life?2019Radioactivity
  16. 16The end product of decay of \( { }_{90} T h^{232} \) is \( { }_{82} P b^{208} . \) The number of \( \) and \( \) particles emitted are respe2019Radioactivity
  17. 17Two protons are kept at a separation of \( 10 {~nm} \). Let Fn and Fe be the nuclear force and the electromagnetic force between them2019Nuclear energy
  18. 18The energy equivalent to a substance of mass \( 1 {~g} \) is2018Nuclear energy
  19. 19The half life of tritium is \( 12.5 \) years. What mass of tritium of initial mass \( 64 {~g} \) will remain undecayed after \( 50 \) years?2018Radioactivity
  20. 20The angle between velocity and acceleration of a particle describing uniform circular motion is2017Radioactivity
  21. 21Of the following graphs, the one that correctly represents the I−V. characteristics of a ‘Ohmic device’ is2017Nuclear energy
  22. 22The energy (in eV) required to excite an electron from \( n=2 \) to \( n=4 \) state in hydrogen atom is2017Nuclear reactions
  23. 23In a nuclear reactor the function of the Moderator is to decrease2017Nuclear structure
  24. 24Electromagnetic radiation used to sterilise milk is2016Radioactivity
  25. 25A radio-active sample of half-life \( 10 \) days contains \( 1000 \) nuclei. Number of original nuclei present after \( 5 \) days is2016Radioactivity
  26. 26An element \( X \) decays into element \( Z \) by two-step process. \[ {array}{l} X Y+4 e \\ Y Z+2 e^{-} {then }: {array} \]2016Radioactivity
  27. 27A nucleus of mass \( 20 {u} \) emits a \( {y} \) photon of energy \( 6 {MeV} \). If the emission assume to occur when nucleus is free and re2016Radioactivity
  28. 28Amplitude modulation has2015Radioactivity
  29. 29The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?2015Radioactivity
  30. 30Die input characteristics of a transistor in CE mode is the graph obtained by plotting2015Nuclear structure
  31. 31What is the de Broglie wavelength of the electron accelerated through a potential difference of \( 100 \) Volt?2014Radioactivity
  32. 32The ionisation energy of an electron in the ground state of helium atom is . The energy required to remove both the electron is2013Nuclear energy
  33. 33Pick out the correct statements from the following I. Electron emission during -decay is always accompanied by neutrino. II. Nuclear force i2013Radioactivity
  34. 34A nucleus emits an -particle with velocity . The recoil speed of the daughter nucleus is2013Radioactivity
  35. 35A radioactive substance emits 100 beta particles in the first and 50 beta particles in the next . The mean life of the sample is2013Radioactivity
  36. 36Which one of the following is not correct?2013Radioactivity
  37. 37and are the two radioactive elements. The mixtue of these elements show a total activity of 1200 disintergrations/minute. The half-life of i2013Radioactivity
  38. 38The binding energy/nucleon of deuteron and the helium atom are and respectively. If the two deuteron atoms fuse to form a single helium atom2013Nuclear energy
  39. 39Decay constants of two radio-active samples A and are and respectively. They have equal number of initial nuclei. The ratio of the number of2012Radioactivity
  40. 40Mass number of the elements A, B, C and D are and 120 respectively. The specific binding energy of them are , and respectively. Then, in whi2012Nuclear energy
  41. 41The radius of nucleus in Fermi is (given )2012Nuclear structure
  42. 42In a radioactive decay, an element emits four -particles, three -particles and eight gamma photons. The atomic number and mass number of the2012Radioactivity
  43. 43A radioactive nucleus has specific binding energy . It emits an -particle. The resulting nucleus has specific binding energy . Then2012Nuclear energy
  44. 44The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a cat2011Nuclear reactions
  45. 45The fraction of the initial number of radioactive nuclei which remain undecayed after half of a half-life of the radioactive sample is2011Radioactivity
  46. 461 curie represents2011Radioactivity
  47. 47Assume the graph of specific binding energy versus mass number is as shown in the figure. Using this graph, select the correct choice from t2010Nuclear energy
  48. 48Pick out the correct statement from the following.2010Nuclear reactions
  49. 49A radioactive sample having the activity has twice the number of nuclei as another sample of activity . If , then the ratio of half-life of 2010Radioactivity
  50. 50When a neutron is disintegrated to give a -particle,2010Radioactivity

Frequently Asked Questions

1.How many questions are available for Nuclear Physics?

This chapter includes 64 questions compiled from KCET papers spanning 2007 to 2025.

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

These are KCET 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 KCET Physics?

Nuclear Physics has appeared in 19 of the 20 years of KCET papers covered here, with 64 questions across 19 papers - about 3 per paper it appears in.

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

Of the 64 questions analysed for this chapter, 58% are easy, 34% moderate and 8% tough. 2013 had the most, with 7 questions.

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

These topics have carried the most weightage in Nuclear Physics:

  • Radioactivity - 32 questions (50%)
  • Nuclear energy - 13 questions (20%)
  • Nuclear structure - 10 questions (16%)
  • Radioactivity has produced the most tough questions (3).
6.Is Nuclear Physics's weightage in KCET going up or down?

Across all 19 papers analysed, Nuclear Physics has averaged about 3.4 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.