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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 6 September 2020, Shift 2, Physics Q18

Question 18 of 75 in this shift, Physics question 18 of 25.

Given the masses of various atomic particles mp=1.0072m_p=1.0072 u, mn=1.0087m_n=1.0087 u, me=0.000548m_e=0.000548 u, mνˉ=0m_{\bar\nu}=0, md=2.0141m_d=2.0141 u, where p≡p\equiv proton, n≡n\equiv neutron, e≡e\equiv electron, νˉ≡\bar\nu\equiv antineutrino and d≡d\equiv deuteron. Which of the following process is allowed by momentum and energy conservation ?
  1. (1)p→n+e++νˉp \to n + e^{+} + \bar\nu
  2. (2)e++e−→γe^{+} + e^{-} \to \gamma
  3. (3)n+p→d+γn + p \to d + \gammaOfficial answer
  4. (4)n+non + n o deuterium atom (electron bound to the nucleus)

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Nuclei
Topic
Nuclear Binding Energy
Idea tested
Q-Value and Reaction Spontaneity

Same topic in other shifts

All Nuclear Binding Energy questions
  1. 2 Apr 2026, Shift 2 · Q44The binding energy per nucleon of 20983Bi\frac{209}{83}Bi isMediumSingle correct
  2. 4 Apr 2026, Shift 1 · Q29Two nuclei of mass number 33 combine with another nucleus of mass number 44 to yield a nucleus of mass number 1010. If the binding…MediumSingle correct
  3. 5 Apr 2026, Shift 2 · Q44Assuming the experimental mass of 612C{}^{12}_{6}\mathrm{C} as 12 u, the mass defect of 612C{}^{12}_{6}\mathrm{C} atom is ________…EasySingle correct
  4. 6 Apr 2026, Shift 1 · Q48The energy released when 717.13\frac{7}{17.13} kg of 37Li^{7}_{3}\mathrm{Li} is converted into 24He^{4}_{2}\mathrm{He} by proton bombardment is…MediumNumerical value
  5. 6 Apr 2026, Shift 2 · Q41The energy released if hydrogen atoms are combined to form 24He^{4}_{2}\mathrm{He} is __________ MeV. (Take binding energies per nucleon of…EasySingle correct
  6. 2 Apr 2025, Shift 2 · Q38Energy released when two deuterons (1H2_1\mathrm{H}^2) fuse to form a helium nucleus (2He4_2\mathrm{He}^4) is : (Given : Binding energy per…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.