nuclear fission and fusion ,nuclear reactor questions with solutions

Showing 1–10 of 40 questions

• NumericmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  A nuclear power plant delivers a continuous electrical power of 1.0 MW with an overall efficiency of 25%. Each U-235 fission releases 200 MeV. Take Avogadro constant Nₐ = 6.0×10²³ mol⁻¹ and 1 eV = 1.6×10⁻¹⁹ J. If the mass of U-235 actually fissioned in one day is N g, find N rounded to the nearest integer.

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  A village consumes 5.0×10⁴ kWh of electrical energy per day. A nuclear power plant supplying the village has an overall electrical efficiency of 30%. Assume complete fission of U-235 and take the nuclear energy released by 1.00 g of fully fissioned U-235 as 8.2×10¹⁰ J. Approximately how much U-235 must actually undergo fission each day?

  Options

  • Option A

    0.73 g

  • Option B

    2.2 g

  • Option C

    7.3 g

  • Option D

    73 g

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• MCQeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  In a thermal nuclear reactor, fast neutrons produced during fission are slowed down by a moderator. Which property is most desirable for an effective moderator?

  Options

  • Option A

    It should absorb a large fraction of neutrons

  • Option B

    It should remove neutron kinetic energy efficiently while absorbing as few neutrons as possible

  • Option C

    It should increase the electric charge of neutrons

  • Option D

    It should initiate β-decay in the fuel

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  Two suitable light nuclei fuse and form a more tightly bound product nucleus while releasing energy. Which change must normally occur for the fusion reaction to be exoergic?

  Options

  • Option A

    Binding energy per nucleon decreases

  • Option B

    Binding energy per nucleon increases

  • Option C

    Total number of nucleons decreases

  • Option D

    Rest mass of the products becomes greater than the rest mass of the reactants

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• MCQeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  A reactor produces 3000 MW of thermal power and supplies 1000 MW of electrical power to the grid. What is its overall thermal-to-electrical efficiency?

  Options

  • Option A

    20%

  • Option B

    25%

  • Option C

    33.3%

  • Option D

    66.7%

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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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• NumericmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  A uranium-235 nucleus absorbs a neutron and undergoes the fission reaction ²³⁵₉₂U + ¹₀n → ¹⁴⁴₅₆Ba + ᴬ₃₆Kr + 3(¹₀n). If A is the mass number of the krypton fragment, find A.

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• NumericmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  The disintegration energy Q for the nuclear fission of ²³⁵U → ¹⁴⁰Ce + ⁹⁴Zr + n is ______ MeV.

  Given atomic masses: ²³⁵U = 235.0439 u, ¹⁴⁰Ce = 139.9054 u, ⁹⁴Zr = 93.9063 u, n = 1.0086 u, c² = 931 MeV/u.

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  JEE Mains 2024 04 Apr Evening Shift

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• MCQeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  In a hypothetical fission reaction

  ²³⁶₉₂X → ¹⁴¹₅₆Y + ⁹²₃₆Z + 3R

  The identity of emitted particles (R) is:

  Options

  • Option A

    Proton

  • Option B

    Electron

  • Option C

    Neutron

  • Option D

    γ-radiations

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• MCQeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  Two light nuclei combine to form a heavier nucleus. The measured total rest mass of the final products is smaller than the total rest mass of the initial nuclei. Which statement correctly explains the energy released in this fusion reaction?

  Options

  • Option A

    Energy is produced because electric charge is destroyed

  • Option B

    The decrease in rest mass appears as energy according to E = Δm·c²

  • Option C

    The total number of nucleons decreases during fusion

  • Option D

    Nuclear density becomes zero after fusion

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