Nuclei MCQs Mock Test of Class 12th Physics

Welcome to your Nuclei MCQs Mock Test of Class 12th Physics

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Q.1. Samples of two radioactive nuclides A and B are taken λA and λB are the disintegration constants of A and B respectively. In which of the following cases, the two samples can simultaneously have the same decay rate at any time?
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Q 2. Radioactivity is the phenomenon associated with
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Q 3. Which of the following are not emitted by radioactive substances?
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Q 4. In an α-decay
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Q.5. For a nuclear fusion process, suitable nuclei are
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Q.6. In the uranium radioactive series, the initial nucleus is 92U238 and that the final nucleus is 82Pb206. When uranium nucleus decays to lead, the number of α particles and β particles emitted are
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Q.7. The nuclear radius is of the order of
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Q.8. Particles which can be added to the nucleus of an atom without changing its chemical properties are called
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Q.9. The radius of a nucleus is
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Q.10. Nucleus of an atom whose atomic mass is 24 consists of
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Q.11. The electrons cannot exist inside the nucleus because
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Q.12. In …X… water is circulated though the reactor vessel and transfers energy to steam generator in the …Y… Here, X and Y refer to
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Q.13. A nuclei having same number of neutron but different number of protons / atomic number are called
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Q.14. Which one of the following has the identical property for isotopes?
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Q.15. The number of protons in an atom of atomic number Z and mass number A is
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Q.16. When the number of nucleons in nuclei increases, the binding energy per nucleon
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Q.17. Mp denotes the mass of a proton and Mn that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by (c is the velocity of light)
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Q.18. Mass energy equation was propounded by
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Q.19. The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into
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Q.20. Which of the following statement is not true regarding Einsteins mass energy relation?
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Q.21. The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
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Q.22. Nuclear forces are
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Q.23. Nuclear forces exists between
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Q.24. The antiparticle of electron is
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Q.25. Neutron decay in free space is given as follows 0n1 → 1H1 + -1e0 + [] Then the parenthesis [ ] represents a
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Q.26. Radioactivity is
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Q.27. γ-rays are deflected by
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Q.28. Beta rays emitted by a radioactive material are
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Q.29. Which of the following is not a mode of radioactive decay ?
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Q.30. The half-life period and the mean life period of a radioactive element are denoted respectively by Th and Tm. Then
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Q.31. In γ ray emission from a nucleus
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Q.32. Artificial radioactivity was discovered by
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Q.33. Radioactive samples are stored in lead boxes because it is
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Q.34. The process of radioactive radiations remains unaffected due to
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Q.35. A radioactive material undergoes decay by ejecting electrons. The electron ejected in this process is
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Q.36. The same radioactive nucleus may emit
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Q.37. Which of the following of a radioactive material is a measure of its instability?
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Q.38. The rate of disintegration at a given instant, is directly proportional to the number of Nuclei present at that instant. This is the statement of
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Q.39. Three specimens A, B, C of same radioactive element has activities 1 microcurie, 1 rutherford and 1 becquerel respectively. Which specimen has maximum mass?
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Q.40. If a radioactive element is placed in an evacuated chamber, then the rate of radioactive decay will
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Q 41. Tritium is an isotope of hydrogen whose nucleus Triton contains 2 neutrons and 1 proton. Free neutrons decay into p + e¯+v¯. If one of the neutrons in Triton decays, it would transform into He3 nucleus. This does not happen. This is because [NCERT Exemplar]
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Q.42. Radioactive substance emits
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Q43. When a β-particle is emitted from a nucleus then its neutron-proton ratio
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Q44.. A radioactive nucleus emits a beta particle. The parent and daughter nuclei are
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Q45. The quantity which is not conserved in a nuclear reaction is
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Q.46. The ‘rad’ is the correct unit used to report the measurement of
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Q.47. One curie is equal to
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Q.48. Half life of radioactive element depends upon
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Q.49. A nuclear reaction is given by ZXA → Z+1YA + -1e0 + ν̅
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Q.50. Fusion reaction occurs at temperatures of the order of

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