Nuclear Physics JEE Main PYQs PDF, 2020–2026

Nuclear Physics questions per year

Topic-wise weightage by year

How many Nuclear Physics questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 13 JEE Main 2026 Nuclear Physics questions in the free PDF, latest shift first.

1. JEE Main 2026 · 8 Apr · Shift 2 · Radioactivity

   Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous $\alpha$-decay with same $Q$ value of 1 MeV . The ratio of energies of $\alpha$-rays produced by A and B is $\_\_\_\_$ .

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2. JEE Main 2026 · 6 Apr · Shift 2 · Nuclear Fusion

   The energy released if hydrogen atoms are combined to form ${}_{2}^{4}{\mathrm{He}}$ is $\_\_\_\_$ MeV .

   (Take binding energies per nucleon of ${}_{1}^{2}{\mathrm{H}}$ and ${}_{2}^{4}{\mathrm{He}}$ as 1.1 MeV and 7.2 MeV , respectively)

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3. JEE Main 2026 · 6 Apr · Shift 1 · Mass Defect and Binding Energy

   The energy released when $\frac{7}{17.13}{\ \mathrm{kg}}$ of ${}_{3}^{7}{\mathrm{Li}}$ is converted into ${}_{2}^{4}{\mathrm{He}}$ by proton bombardment is $\alpha\times {10}^{{32}}{\mathrm{eV}}$. The value of $\alpha$ is $\_\_\_\_$ . (Nearest integer) (Mass of ${}_{3}^{7}{\mathrm{Li}}=7.0183{\mathrm{u}}$, mass of ${}_{2}^{4}{\mathrm{He}}=4.004{\mathrm{u}}$, mass of proton $=1.008{\mathrm{u}}$ and $1{\mathrm{u}}=931{\mathrm{MeV}}/{\mathrm{c}}^{2}$ and Avogadro number $=6.0\times {10}^{{23}}$ )

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4. JEE Main 2026 · 5 Apr · Shift 2 · Mass Defect and Binding Energy

   Assuming the experimental mass of ${}_{6}^{{12}}C$ as $12u$, the mass defect of ${}_{6}^{{12}}C$ atom is $\_\_\_\_$ ${\mathrm{MeV}}/{\mathrm{c}}^{2}$.

   (Mass of proton $=1.00727{\mathrm{u}}$. mass of neutron $=1.00866{\mathrm{u}},1{\mathrm{u}}=931.5{\mathrm{MeV}}/{\mathrm{c}}^{2}$ and c is the speed of the light in vacuum).

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5. JEE Main 2026 · 4 Apr · Shift 1 · Mass Defect and Binding Energy

   Two nuclei of mass number 3 combine with another nucleus of mass number 4 to yield a nucleus of mass number 10. If the binding energy per nucleon for the mass numbers 3,4 and 10 are $5.6{\mathrm{MeV}},7.4{\mathrm{MeV}}$ and 6.1 MeV , respectively, then in the process, $\Delta{\mathrm{Mc}}^{2}=$ $\_\_\_\_$ MeV .

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6. JEE Main 2026 · 2 Apr · Shift 2 · Mass Defect and Binding Energy

   The binding energy per nucleon of ${}_{{83}}^{{209}}Bi$ is _______ MeV.

   [Take $m(_{{83}}^{{209}}Bi)=208.980388\ \text{u}$, $m_{p}=1.007825\ \text{u}$, $m_{n}=1.008665\ \text{u}$, $1\ \text{u}=931\ \text{MeV}/c^{2}$]

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7. JEE Main 2026 · 28 Jan · Shift 1 · Nuclear Size and Density

   An atom ${}_{3}^{8}X$ is bombarded by shower of fundamental particles and in 10 s this atom absorbed 10 electrons, 10 protons and 9 neutrons. The percentage growth in the surface area of the nucleons is recorded by :

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8. JEE Main 2026 · 28 Jan · Shift 2 · Nuclear Size and Density

   A nucleus has mass number $\alpha$ and radius $R_{{\alpha}}$. Another nucleus has mass number $\beta$ and radius $R_{{\beta}}$.

   If $\beta=8\alpha$ then $R_{{\alpha}}/R_{{\beta}}$ is :

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9. JEE Main 2026 · 24 Jan · Shift 2 · Mass Defect and Binding Energy

   The binding energy for the following nuclear reactions are expressed in MeV .

   $\begin{array}{cc} & {}_{2}{\mathrm{He}}^{3}+{}_{0}{\mathrm{n}}^{1}\rightarrow {}_{2}{\mathrm{He}}^{4}+20{\mathrm{MeV}} \\ & {}_{2}{\mathrm{He}}^{4}+{}_{0}{\mathrm{n}}^{1}\rightarrow {}_{2}{\mathrm{He}}^{5}-0.9{\mathrm{MeV}}\end{array}$

   If ${\mathrm{X}}_{3},{\mathrm{X}}_{4},{\mathrm{X}}_{5}$ denote the stability of ${}_{2}{\mathrm{He}}^{3},{}_{2}{\mathrm{He}}^{4}$ and ${}_{2}{\mathrm{He}}^{5}$, respectively, then the correct order is :

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10. JEE Main 2026 · 24 Jan · Shift 1 · Mass Defect and Binding Energy

    Given below are two statements :

    Statement I : For all elements, greater the mass of the nucleus, greater is the binding energy per nucleon.

    Statement II : For all elements, nuclei with less binding energy per nucleon transforms to nuclei with greater binding energy per nucleon.

    In the light of the above statements, choose the correct answer from the options given below

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11. JEE Main 2026 · 23 Jan · Shift 2 · Nuclear Size and Density

    Which of the following pair of nuclei are isobars of the element?

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12. JEE Main 2026 · 23 Jan · Shift 2 · Nuclear Fission

    The average energy released per fission for the nucleus of ${}_{{92}}^{{235}}{\mathrm{U}}$ is 190 MeV . When all the atoms of 47 g pure ${}_{{92}}^{{235}}{\mathrm{U}}$ undergo fission process, the energy released is $\alpha\times {10}^{{23}}{\mathrm{MeV}}$. The value of $\alpha$ is $\_\_\_\_$ .

    (Avogadro Number $=6\times {10}^{{23}}$ per mole)

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Practise the 2026 Nuclear Physics questions online

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