JEE Main Physics · Nuclei

Fission and Fusion in JEE Main

Name: Fission and Fusion: JEE Main previous year questions
Creator: Lumi

Fission and Fusion (Physics, Nuclei) came 6 times in 6 of the 42 JEE Main shifts Lumi analysed, across 6 distinct ideas. 5 of them came in 2024–26; it was last asked in 2025.

Questions: 6; in 6 shifts
Ideas asked: 6; 0 asked more than once
Numerical answer: 1; 17% of its questions
Pattern: Frequent; last asked 2025

Questions each year

In the shifts Lumi analysed for each year.

Difficulty and format

Easy 0Medium 5Hard 1

Format

Single correct4 Q
Match the list1 Q
Numerical value1 Q

Ideas inside the topic

6 ideas

Mass Defect to MeV Conversion1 Q
Energy Density Comparison1 Q
Fission Fragment Kinematics1 Q
Reactor Power Calculation1 Q
Q-Value of a Reaction1 Q
Q-Value Sign Convention1 Q

Where it sits

Part of Nuclei, which had 38 questions in all. Fission and Fusion accounts for 16% of them. In Lumi's JEE taxonomy it belongs to Modern Physics.

Every question

All 6 Fission and Fusion questions

Newest first, each with its options and official answer.

3 Apr 2025, Shift 1 · Q44Match the LIST-I with LIST-II LIST-I A.…MediumMatch the list
9 Apr 2024, Shift 1 · Q60A star has $100\%$ helium composition. It starts to convert three ${}^4\mathrm{He}$ into one ${}^{12}\mathrm{C}$ via triple alpha process…HardNumerical value
9 Apr 2024, Shift 2 · Q37The energy released in the fusion of $2\ kg$ of hydrogen deep in the sun is $E_H$ and the energy released in the fission of $2\ kg$ of…MediumSingle correct
29 Jan 2024, Shift 1 · Q47The explosive in a Hydrogen bomb is a mixture of ${}_1\mathrm{H}^2$ , ${}_1\mathrm{H}^3$ and ${}_3\mathrm{Li}^6$ in some condensed form.…MediumSingle correct
30 Jan 2024, Shift 2 · Q47In a nuclear fission reaction of an isotope of mass $M$ , three similar daughter nuclei of same mass are formed. The speed of a daughter…MediumSingle correct
2 Sep 2020, Shift 1 · Q18In a reactor, 2 kg of $_{92}\mathrm{U}^{235}$ fuel is fully used up in 30 days. The energy released per fission is 200 MeV. Given that the…MediumSingle correct