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Physics - Nuclear Physics

Practise 78 AIIMS previous year questions on Nuclear Physics, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Nuclear Physics has been asked in 18 of the 19 years of AIIMS papers analysed (2001–2019), with 78 questions in all. 55% of them were easy, 31% moderate and 14% tough. Most of its questions came from 2011, with 9 questions that year. In the last three years (2017–2019) it had 11 questions across 5 papers, about 2.2 per paper.

The chapter's 4 topics are not weighted equally: Radioactivity (38 questions, 49%), Nuclear reactions (23 questions, 29%), and Nuclear structure (9 questions, 12%) have been asked the most. Radioactivity has produced the most tough questions (5).

  1. 1If half life of an element is 69.3 hours then how much of its percent will decay between and hour. Initial activity .26 May, 2019Radioactivity
  2. 2A sample has half life of year. If initial number of nuclei of the sample is . Then find out the number of nuclei decayed in 1 year.26 May, 2019Radioactivity
  3. 3The half-life of is . The time taken for the radioactivity of a sample of At to decay to of its initial value is25 May, 2019Radioactivity
  4. 4Assertion : Heavy water is a better moderator than normal water. Reason : Heavy water absorbs neutrons more efficiently than normal water.25 May, 2019Nuclear structure
  5. 5If decay constant of a radioactive sample is 0.05 per year, then find the time (in year) for which sample will decay by .27 May, 2018Radioactivity
  6. 6The activity of a sample of radioactive material is at time and at time . If its mean life is , then26 May, 2018Radioactivity
  7. 7In a nuclear fusion reaction, two nuclei, and fuse to produce a nucleus , releasing an amount of energy in the process. If the mass defects 26 May, 2018Nuclear reactions
  8. 8Assertion : Mass is not conserved, but mass and energy are conserved as a single entity is called mass-energy. Reason: Mass and energy are i26 May, 2018Nuclear energy
  9. 9Two radioactive materials and have decay constants and respectively. If initially they have the same number of nuclei, then the ratio of the2017Radioactivity
  10. 10A neutron in a nuclear reactor collides head on elastically with the nucleus of a carbon atom initially at rest. The fraction of kinetic ene2017Nuclear reactions
  11. 11Assertion : Thermonuclear fusion reactions may become the source of unlimited power for the mankind. Reason : A single fusion event involvin2017Nuclear reactions
  12. 12An atom of mass number 15 and atomic number 7 captures an -particle and then emits a proton. The mass number and atomic number of the result2016Nuclear structure
  13. 13Assertion : Generally heavy nuclei are unstable Reason : It has more neutrons and protons.2016Nuclear structure
  14. 14Assertion : Heavy water is used as moderator in nuclear reactor. Reason: Water cool down the fast neutron.2016Nuclear reactions
  15. 15Assertion : Unlike electric force and gravitational forces, nuclear force has limited range. Reason : Nuclear force do not obey inverse squa2016Nuclear energy
  16. 16The half-life of radium is 1600 years. What is the fraction of sample undecayed after 6400 years?2015Radioactivity
  17. 17Assertion : If a heavy nucleus is split into two medium sized parts, each of the nuclei will have more binding energy per nucleon than the o2015Nuclear energy
  18. 18-alpha particles per second are emitted from atoms of a radioactive element. The half-life of the radioactive element is2014Radioactivity
  19. 19Assertion: The ratio for time taken for light emission from an atom to that for release of nuclear energy in fission is . Reason: Time taken2014Nuclear reactions
  20. 20Assertion : -radiation emission occurs after and decay. Reason: Energy levels occur in nucleus.2014Radioactivity
  21. 21In nuclear fission, which of the following quantity is conserved ?2013Nuclear reactions
  22. 22When a slow neutron is captured by a nucleus, a fission energy releasing . If power of nuclear reactor is then rate of nuclear fission is2013Nuclear reactions
  23. 23Which of the following statement is incorrect?2013Radioactivity
  24. 24In beta plus decay2013Radioactivity
  25. 25Assertion : is a source of gamma radiation. Reason : Gamma emission is due to nuclear decay.2013Radioactivity
  26. 26Half life of a radio-active element is 8 years, how much amount will be present after 32 years?2012Radioactivity
  27. 27Gamma decay takes place2012Radioactivity
  28. 28The nucleus emits one particle and -particles. The resulting nucleus is2012Radioactivity
  29. 29Assertion: At rest, radium is decayed into Radon and an -particle. They both moves back to back of each other. Reason : Splitting of radioac2012Radioactivity
  30. 30Assertion : More energy is released in fusion than fission. Reason : More number of nucleons take part in fission.2012Nuclear reactions
  31. 31Assertion : -radiation emission occurs after and decay. Reason : Energy levels occur in nucleus.2012Radioactivity
  32. 32The ratio of the masses of the elements having their nuclear radii 2 fermi and 1 fermi is2011Nuclear structure
  33. 33For a nuclear reactor to run in critical condition the reproduction factor should be2011Nuclear reactions
  34. 34absorbs energy and decays into which element after two -emissions?2011Radioactivity
  35. 35Half life of a radioactive material is 5 years, then the percentage of it remained after 25 years will be2011Radioactivity
  36. 36Among the following which is used to control the rate of reaction in nuclear fission reactions?2011Nuclear reactions
  37. 37Assertion : For nuclear reactor, it is desirable to have . Reason : Sustained chain reaction occur at this critical condition.2011Nuclear reactions
  38. 38Assertion : Mass defect in nuclear reactions is less than Reason : In nuclear reaction, change in is generally less than .2011Nuclear reactions
  39. 39Assertion : It is very easy to detect neutrino in nature. Reason : It has high affinity to interact with matter.2011Nuclear structure
  40. 40Assertion : It is desirable to slow down fast moving neutrons to sustain controlled chain reactions. Reason : Slow moving neutrons efficient2011Nuclear reactions
  41. 41Two radioactive substances and have decay constants and respectively. At , they have the same number of nuclei. The ratio of number of nucle2010Radioactivity
  42. 42The intensity of gamma radiation from a given source is . On passing through of lead, it is reduced to . The thickness of lead which will re2010Radioactivity
  43. 43A nucleus of mass number 220 decays by decay. The energy released in the reaction is . The kinetic energy of an -particle is2009Nuclear energy
  44. 44If the half lives of a radioactive element for and decay are 4 years and 12 years respectively, the ratio of its inital activity and that af2009Radioactivity
  45. 45A radioactive nucleus is being produced at a constant rate per second. Its decay constant is . If are the number of nuclei at time , then th2009Radioactivity
  46. 46Assertion : Nuclei having mass number about 60 are most stable. Reason : When two or more light nuclei are combined into a heavier nucleus, 2009Nuclear energy
  47. 47\(N_1\) atoms of a radioactive element emit \(N_2\) beta particles per second. The decay constant of the element is (in s \({ }^{-1}\) )2008Radioactivity
  48. 48Assertion : \({ }^{90} {Sr}\) from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consum2008Radioactivity
  49. 49What is the amount of energy released by deuterium and tritium fusion? [Given: \(M_{_1^2 {H}}=2.0141024 {~u}, M_{_1^3 {H}}=3.0160504 {~u}\),2007Nuclear reactions
  50. 50Calculate power output of \({ }_{92}^{235} {U}\) reactor, if it takes 30 days to use up \(2 {~kg}\) of fuel, and if each fission gives \(1852007Nuclear reactions

Frequently Asked Questions

1.How many questions are available for Nuclear Physics?

This chapter includes 78 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Nuclear Physics chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

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

Nuclear Physics has appeared in 18 of the 19 years of AIIMS papers covered here, with 78 questions across 20 papers - about 4 per paper it appears in.

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

Of the 78 questions analysed for this chapter, 55% are easy, 31% moderate and 14% tough. 2011 had the most, with 9 questions.

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

These topics have carried the most weightage in Nuclear Physics:

  • Radioactivity - 38 questions (49%)
  • Nuclear reactions - 23 questions (29%)
  • Nuclear structure - 9 questions (12%)
  • Radioactivity has produced the most tough questions (5).
6.Is Nuclear Physics's weightage in AIIMS going up or down?

Across all 20 papers analysed, Nuclear Physics has averaged about 3.9 questions per paper. In the last three years (2017–2019), that average has fallen, at about 2.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.