Nuclear physics questions with solutions

Showing 1–10 of 263 questions

• MCQmediumNuclear physics

  A nuclear transformation is written as X + ¹₀n → ⁷₃Li + ⁴₂He. Which nucleus is X?

  Options

  • Option A

    ¹²₆C

  • Option B

    ¹⁰₅B

  • Option C

    ⁹₅B

  • Option D

    ¹¹₄Be

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• NumericeasyNuclear physicsNucles and its density radius and mass defect ,binding energy and its curve

  A nucleus has mass defect 0.100 u. Take 1 u c² = 930 MeV. If its binding energy is N MeV, find N.

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• MCQeasyNuclear physicsNucles and its density radius and mass defect ,binding energy and its curve

  The ratio of the density of oxygen nucleus ¹⁶₈O and helium nucleus ⁴₂He is:

  Options

  • Option A

    4:1

  • Option B

    8:1

  • Option C

    1:1

  • Option D

    2:1

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• MCQmediumNuclear physicsradioactivity and law of decay

  A radioactive nucleus has mean life τ. What is the probability that it survives up to time τ but decays before time 3τ?

  Options

  • Option A

    0.050

  • Option B

    0.135

  • Option C

    0.318

  • Option D

    0.632

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  Which statement best distinguishes uranium-235 and uranium-238 in a conventional thermal-neutron reactor?

  Options

  • Option A

    Both isotopes undergo thermal-neutron fission with essentially the same probability

  • Option B

    Uranium-238 is readily fissile with slow neutrons but uranium-235 is not

  • Option C

    Uranium-235 is readily fissile with thermal neutrons, whereas uranium-238 is mainly fertile and can ultimately produce plutonium-239 after neutron capture

  • Option D

    Neither isotope can absorb neutrons

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• NumericeasyNuclear physics

  A radioactive nucleus decays by two independent processes with half-lives 5 min and 30 s. If the effective half-life is α/11 seconds, find α.

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  In a controlled fusion experiment, deuterium and tritium nuclei are heated to an extremely high temperature before an appreciable fusion rate is obtained. What is the main physical reason for using such a high temperature?

  Options

  • Option A

    To increase nuclear radius enormously

  • Option B

    To give the positively charged nuclei enough kinetic energy to approach closely and overcome, or tunnel through, the Coulomb barrier

  • Option C

    To convert all neutrons into protons

  • Option D

    To reduce the binding energy of the final nucleus

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• NumericmediumNuclear physicsradioactivity and law of decay

  Two radioactive samples X and Y initially have activities 800 Bq and 100 Bq. Their half-lives are 2 h and 6 h respectively. After how many hours will their activities become equal?

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• MCQmediumNuclear physics

  A nucleus of uranium decays at rest into nuclei of Thorium and Helium. Then :

  Options

  • Option A

    The Helium nucleus has less kinetic energy than the Thorium nucleus

  • Option B

    The Helium has more kinetic energy than the Thorium nucleus

  • Option C

    The Helium nucleus has less momentum than the Thorium nucleus

  • Option D

    The Helium nucleus has more momentum than the Thorium nucleus

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• NumericeasyNuclear physicsradioactivity and law of decay

  A sample initially contains 3200 radioactive nuclei. Find the number of nuclei that decay between the end of the second half-life and the end of the fifth half-life.

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