nuclear fission and fusion ,nuclear reactor questions with solutions

Showing 1–10 of 40 questions

• 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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• MCQeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  In a nuclear power station, which sequence most correctly describes the conversion of nuclear energy into electrical energy?

  Options

  • Option A

    Nuclear energy → reactor heat → steam or working-fluid motion → turbine mechanical energy → electrical energy

  • Option B

    Nuclear energy → electrical energy directly inside the uranium nucleus

  • Option C

    Nuclear energy → chemical energy → electrical energy

  • Option D

    Neutron energy → electron mass → nuclear energy

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• NumericeasyNuclear physicsnuclear fission and fusion ,nuclear reactor

  The average energy released per fission for the nucleus of ²³⁵₉₂U is 190 MeV. When all the atoms of 47 g pure ²³⁵₉₂U undergo fission process, the energy released is α × 10²³ MeV. The value of α is _______.

  (Avogadro Number = 6 × 10²³ per mole)

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  JEE Mains 202623 January 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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  JEE Mains 2024 08 Apr Evening Shift

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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

  The effective neutron multiplication factor of a reactor is defined as k = (number of neutrons in one generation) ÷ (number of neutrons in the preceding generation). Under which condition is the reactor operating at a steady, self-sustained power level?

  Options

  • Option A

    k < 1

  • Option B

    k = 1

  • Option C

    k > 1

  • Option D

    k = 0

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  Match List-I with List-II. List-I: (A) ¹₀n + ²³⁵₉₂U → ¹⁴⁰₅₄Xe + ⁹⁴₃₈Sr + 2¹₀n; (B) 2H₂ + O₂ → 2H₂O; (C) ²₁H + ²₁H → ³₂He + ¹₀n; (D) ¹₁H + ³₁H → ²₁H + ²₁H. List-II: (I) chemical reaction, (II) fusion with positive Q-value, (III) fission, (IV) fusion with negative Q-value. Choose the correct match.

  Options

  • Option A

    A–II, B–I, C–III, D–IV

  • Option B

    A–III, B–I, C–IV, D–II

  • Option C

    A–III, B–I, C–II, D–IV

  • Option D

    A–II, B–I, C–IV, D–III

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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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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  Uranium-238 captures a neutron and the product subsequently undergoes two β⁻-decays, following the sequence ²³⁸₉₂U + n → ²³⁹₉₂U → ²³⁹₉₃Np → ²³⁹₉₄Pu. Which statement about this sequence is correct?

  Options

  • Option A

    The two β⁻-decays increase the atomic number from 92 to 94 while leaving the mass number unchanged

  • Option B

    Each β⁻-decay reduces the mass number by 1

  • Option C

    Neutron capture reduces the mass number of uranium

  • Option D

    Plutonium-239 contains fewer nucleons than uranium-238

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• MCQmediumNuclear physicsnuclear fission and fusion ,nuclear reactor

  The energy released in the fusion of 2 kg of hydrogen deep in the sun is E(H) and the energy released in the fission of 2 kg of ²³⁵U is E(U). The ratio E(H)/E(U) is approximately :

  (Consider the fusion reaction as 4 ¹₁H + 2e⁻ → ⁴₂He + 2ν + 6γ + 26.7 MeV, energy released in the fission reaction of ²³⁵U is 200 MeV per fission nucleus and N(A) = 6.023 × 10²³)

  Options

  • Option A

    9.13

  • Option B

    15.04

  • Option C

    7.62

  • Option D

    25.6

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