Nuclei

Bihar Board Class 12 · Physics · 30 past questions

1. Q1 2026 Set A

   The nuclear density is approximately

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2. Q2 2026 Set A

   Which of the following are known as nucleons ?

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3. Q3 2026 Set A

   Radioactivity was discovered by

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4. Q4 2025 Set D

   What is the main difference between isotopes of the same element?

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5. Q5 2025 Set D

   Which one of the following is not a type of radioactive decay?

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6. Q6 2025 Set D

   Equivalent energy of 1 amu is

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7. Q7 2024 Set A

   Half-life of radioactive substance is

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8. Q8 2024 Set A

   S.I. unit of decay constant is

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9. Q9 2024 Set A

   Number of neutrons in an atom of ${}_{90}\mathrm{Th}^{230}$ is

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10. Q10 2023 Set F

    The function of moderator in nuclear reactor is to

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11. Q11 2023 Set F

    The unit of radioactivity is

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12. Q12 2023 Set F

    Which of the following has the highest penetrating power?

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13. Q13 2023 Set F

    The half-life of a radioactive isotope ($^{210}$Bi) is 5 days. The fraction of the nuclei undecayed at the…

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14. Q14 2022 Set I

    Which of the following relations is correct for mass and energy ?

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15. Q15 2022 Set I

    The relation between half-life time $T_{1/2}$ and decay constant is

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16. Q16 2022 Set I

    Which of the following is correct for α-particle?

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17. Q17 2022 Set I

    Which of the following equations is correct?

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18. Q18 2022 Set I

    Number of neutrons in nucleus is

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19. Q19 2021 Set A

    The source of solar energy is

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20. Q20 2021 Set A

    Which of the following represents the $\alpha$-decay of ${}^{A}_{Z}X$?

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21. Q21 2021 Set A

    Which of the following is correct for radioactive element ?

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22. Q22 2021 Set A

    Which of the following is not charged ?

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23. Q23 2019

    The time in which radioactive substance becomes half of its initial amount is called

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24. Q24 2019

    The decay constant of a radioactive substance is $5.2\times10^{-3}$ per year.

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25. Q25 2018

    The quantities, which remain conserved in nuclear reaction…

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26. Q26 2018

    A radio active nucleus undergoes a series of decays as per following scheme…

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27. Q27 2017

    Which one of following in charge less?

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28. Q28 2017

    Time during which the amount of radioactive substance becomes half of its initial amount is called.

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29. Q29 2017

    $\beta-Rays$ are deflected in-

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30. Q30 2017

    Write change in position of atom of an element in periodic table due to emission of $\alpha$ and $\beta$…

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