Physics - Nuclear Physics
Practise 19 WBJEE previous year questions on Nuclear Physics, compiled from papers spanning 2009 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 WBJEE tests.
Nuclear Physics has been asked in 13 of the 18 years of WBJEE papers analysed (2009–2026), with 19 questions in all. 37% of them were easy, 63% moderate and 0% tough. Most of its questions came from 2025, with 3 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.
The chapter's 3 topics are not weighted equally: Radioactivity (12 questions, 63%), Nuclear energy (4 questions, 21%), and Nuclear reactions (3 questions, 16%) have been asked the most. Radioactivity has also led over the last five years, with 3 questions.
- 1A radioactive element emits two -particle, one electrons and two positrons. The transformed nucleus is represented by . The value of is2026Radioactivity
- 2The number of undecayed nuclei N in a sample of radioactive material as a function of time is shown in the figure. Which of the following gr2025Radioactivity
- 3A radioactive nucleus decays as follows : If the mass number and atomic number of ' ' are 172 and 69 respectively, then the atomic number an2025Radioactivity
- 4Let the binding energy per nucleon of nucleus is denoted by ' ' and radius of the nucleus is denoted by' r '. If mass number of nuclei and a2025Nuclear energy
- 5Which of the following statement(s) is/are true in respect of nuclear binding energy? (i) The mass energy of a nucleus is larger than the to2024Nuclear energy
- 6A nucleus X emits a beta particle to produce a nucleus Y. If their atomic masses are and respectively, the maximum energy of the beta partic2020Radioactivity
- 7For nuclei with mass number close to 119 and 238 , the binding energies per nucleon are approximately and respectively. If a nucleus of mass2020Nuclear energy
- 8A parent nucleus undergoes -decay with a half-life of 75000 yrs. The daughter nucleus undergoes -decay with a half-life of 9 months. In a pa2019Radioactivity
- 9If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on the third day? (Give2018Radioactivity
- 10Radon- 222 has a half-life of 3.8 days. If one starts with of radon-222, the quantity of radon- 222 left after 19 days will be2017Radioactivity
- 11For the radioactive nuclei that undergo either or decay, which one of the following cannot occur?2014Radioactivity
- 12The number of atoms of a radioactive substance of half-life is at The time necessary to decay from atoms to atoms will be2013Radioactivity
- 13An alpha particle has a mass of 4.00300 amu. A proton has a mass of 1.00783 amu and a neutron has a mass of 1.00867 amu respectively. The bi2013Nuclear energy
- 14Two radionctive substances and have decay constants and respectively. At they have the same number of nuclei. The ratio of number of nuclei 2012Radioactivity
- 15A radioactive nucleus of mass number A, initially at rest, emits an \( \)-particle with a speed \(v\). The recoil speed of the daughter nucl2011Radioactivity
- 16In the nuclear reaction \({ }_7^{14} {~N}+ {X} { }_6^{14} {C}+{ }_1^1 {H}\) the \( {X}\) will be2011Nuclear reactions
- 17Half-life of a radioactive substance is 20 minute. The time between and decay will be :2010Radioactivity
- 18The energy released by the fission of one uranium atom is . The number of fissions per second required to produce of power is (Take )2010Nuclear reactions
- 19What is the particle in the following nuclear reaction :2009Nuclear reactions
Frequently Asked Questions
1.How many questions are available for Nuclear Physics?
This chapter includes 19 questions compiled from WBJEE papers spanning 2009 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE 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 WBJEE Physics?
Nuclear Physics has appeared in 13 of the 18 years of WBJEE papers covered here, with 19 questions across 13 papers - about one per paper it appears in.
4.What is the difficulty level of Nuclear Physics questions in WBJEE?
Of the 19 questions analysed for this chapter, 37% are easy, 63% moderate and 0% tough. 2025 had the most, with 3 questions.
5.Which topics in Nuclear Physics should I focus on?
These topics have carried the most weightage in Nuclear Physics:
- Radioactivity - 12 questions (63%)
- Nuclear energy - 4 questions (21%)
- Nuclear reactions - 3 questions (16%)
6.Is Nuclear Physics's weightage in WBJEE going up or down?
Across all 13 papers analysed, Nuclear Physics has averaged about 1.5 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.