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Atoms and Nuclei

81 questions · Physics · NEET
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Atoms and Nuclei

81 questions · Physics · NEET

  1. A particle of mass m is moving around the origin with a constant force F pulling it towards the origin. If Bohr model is used to describe its motion, the radius of the nth  orbit and the particle's speed v in the orbit…2025 · Q145 · MCQ
  2. Given below are two statements: Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges. Statement II: Atoms of each element are stable and emit their characteristic spectrum. In the light…2024 · Q161 · MCQ
  3. Match List I with List II: Choose the correct answer from the options given below: Includes table2024 · Q176 · MCQ
  4. 82290​Xα​Ye+​Zβ−​Pe−​Q In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are2024 · Q180 · MCQ
  5. The spectral series which corresponds to the electronic transition from the levels n2​=5,6,… to the level n1​=4 is2024 · Q172 · MCQ
  6. Water is used as a coolant in a nuclear reactor because of its2024 · Q176 · MCQ
  7. Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then : Includes diagram2024 · Q184 · MCQ
  8. Select the correct statements among the following : A. Slow neutrons can cause fission in 92235​U than fast neutrons. B. α-rays are Helium nuclei. C. β-rays are fast moving electrons or positrons. D. γ…2024 · Q193 · MCQ
  9. The ground state energy of hydrogen atom is −13.6 eV. The energy needed to ionize hydrogen atom from its second excited state will be :2023 · Q128 · MCQ
  10. The wavelength of Lyman series of hydrogen atom appears in:2023 · Q153 · MCQ
  11. The angular momentum of an electron moving in an orbit of hydrogen atom is 1.5(πh​). The energy in the same orbit is nearly.2023 · Q172 · MCQ
  12. In hydrogen spectrum, the shortest wavelength in the Balmer series is λ. The shortest wavelength in the Bracket series is :2023 · Q148 · MCQ
  13. The radius of inner most orbit of hydrogen atom is 5.3×10−11 m. What is the radius of third allowed orbit of hydrogen atom?2023 · Q171 · MCQ
  14. Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio R2​R1​​ is :2022 · Q138 · MCQ
  15. The ratio of Coulomb's electrostatic force to the gravitational force between an electron and a proton separated by some distance is 2.4 × 1039. The ratio of the proportionality constant, K=4πε0​1​ to…2022 · Q176 · MCQ
  16. Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to the Bohr's model of an atom, the ratio T1 : T2 is2022 · Q158 · MCQ
  17. A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is2022 · Q173 · MCQ
  18. A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding per nucleon of unfragmented nuclei is 7.6MeV while that of fragments is 8.5MeV. The total gain in the Binding Energy in the process is :2021 · Q131 · MCQ
  19. For which one of the following, Bohr model is not valid?2020 · Q122 · MCQ
  20. The energy equivalent of 0.5 g of a substance is :2020 · Q127 · MCQ
  21. α-particale consists of :2019 · Q122 · MCQ
  22. The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.2019 · Q130 · MCQ
  23. The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is2018 · Q136 · MCQ
  24. The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is2017 · Q141 · MCQ
  25. Given the value of Rydberg constant is 107 m−1, the wave number of the last line of the Balmer series in hydrogen spectrum will be2016 · Q136 · MCQ
  26. When an α-particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as2016 · Q137 · MCQ
  27. If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength λ. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be2016 · Q137 · MCQ
  28. A nucleus of uranium decays at rest into nuclei of thorium and helium. Then2015 · Q127 · MCQ
  29. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is2015 · Q139 · MCQ
  30. Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given K = 9 × 109 constant, Z = 2 and h (Planck's Constant) = 6.6 × 10−34 J s]2015 · Q131 · MCQ
  31. Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 A∘​. Number of spectral lines in the resulting spectrum emitted will be2014 · Q136 · MCQ
  32. The binding energy per nucleon of and nuclei are 5.60 MeV and 7.06 MeV respectively. In the nuclear reaction 37​Li+11​H→24​He+24​He+Q the value of energy Q released is2014 · Q137 · MCQ
  33. How does the Binding Energy per nucleon vary with the increase in the number of nucleons ?2013 · Q139 · MCQ
  34. An electron in hydrogen atom makes a transition n1 → n2 where n1 and n2 are principal quantum numbers of the two states . Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in…2013 · Q140 · MCQ
  35. Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is2013 · Q138 · MCQ
  36. A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)2013 · Q139 · MCQ
  37. The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from2012 · Q83 · MCQ
  38. An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be2012 · Q147 · MCQ
  39. Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ1 : λ2 emitted in the two cases is2012 · Q148 · MCQ
  40. Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?2011 · Q85 · MCQ
  41. An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the…2011 · Q86 · MCQ
  42. The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is2011 · Q138 · MCQ
  43. The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is2011 · Q139 · MCQ
  44. Fusion reaction takes place at high temperature because2011 · Q140 · MCQ
  45. The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is2010 · Q77 · MCQ
  46. The mass of a 37​Li Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of 37​Li nucleus is nearly2010 · Q156 · MCQ
  47. The energy of a hydrogen atom in the ground state is − 13.6 eV. The energy of a He+ ion in the first excited state will be2010 · Q157 · MCQ
  48. The energy of a hydrogen atom in the ground state is − 13.6 eV. The energy of a He+ ion in the first excited state will be2010 · Q158 · MCQ
  49. An alpha nucleus of energy 21​ mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to2010 · Q159 · MCQ
  50. In a Rutherford scattering experiment when a projectile of charge z1 and mass M1 approaches a target nucleus of charge z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is2009 · Q147 · MCQ
  51. The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths, Maximum wavelength of emitted radiation corresponds to the…2009 · Q148 · MCQ
  52. If M(A; Z), Mp and Mn denote the masses of the nucleus ZA​X, proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then2008 · Q141 · MCQ
  53. The ground state energy of hydrogen atom is − 13.6 eV. When its electron is in the first excited state, its excitation energy is2008 · Q142 · MCQ
  54. In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant,…2007 · Q125 · MCQ
  55. A nucleus ZA​X has mass represented by M(A, Z). If Mp and Mn denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then2007 · Q126 · MCQ
  56. The total energy of electron in the ground state of hydrogen atom is − 13.6 eV. The kinetic energy of an electron in the first excited state is2007 · Q127 · MCQ
  57. Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emited by hydrogen will be2006 · Q148 · MCQ
  58. The binding energy of deuteron is 2.2 MeV and that of 24​He is 28 MeV. If two deuterons are fused to form one 24​He then the energy released is2006 · Q149 · MCQ
  59. In the reaction 12​H + 13​H → 24​He + 01​n, if the binding energies of 12​ H, 13​H and 24​He are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is2005 · Q129 · MCQ
  60. The total energy of an electron in the first excited state of hydrogen atom is about − 3.4 eV. Its kinetic energy in this state is2005 · Q142 · MCQ
  61. In any fission process the ratio mass of fission products mass of parent nucleus is2005 · Q143 · MCQ
  62. Fission of nuclei is possible because the binding energy per nucleon in them2005 · Q144 · MCQ
  63. Energy levels A, B and C of a certain atom corresponding to increasing values of energy i.e. EA < EB < EC. If λ1, λ2 and λ3 are wavelengths of radioations corresponding to transitions C to B, B to A and C…2005 · Q145 · MCQ
  64. If M(A; Z), Mp and Mn denote the masses of the nucleus ZA​X, proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then2004 · Q133 · MCQ
  65. The Bohr model of atoms2004 · Q134 · MCQ
  66. If in a nuclear fusion process the masses of the fusing nuclei be m1 and m2 and the mass of the resultant nucleus be m3, then2004 · Q135 · MCQ
  67. An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is2003 · Q145 · MCQ
  68. Solar energy is mainly caused due to2003 · Q146 · MCQ
  69. The volume occupied by an atom is greater than the volume of the nucleus by a factor of about2003 · Q147 · MCQ
  70. The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of 24​ He is (Given helium nucleus mass ≈ 4.0015 u.)2003 · Q148 · MCQ
  71. In which of the following systems will the radius of the first orbit (n = 1) be minimum ?2003 · Q149 · MCQ
  72. Which of the following are suitable for the fusion process ?2002 · Q146 · MCQ
  73. A deutron is bombarded on 8O16 nucleus then α-particle is emitted. The product nucleus is2002 · Q147 · MCQ
  74. X(n, α) 37​Li, then X will be2001 · Q142 · MCQ
  75. The interplanar distance in a crystal is 2.8 × 10−8 m. The value of maximum wavelength which can be diffracted2001 · Q143 · MCQ
  76. Mn and Mp represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be2001 · Q144 · MCQ
  77. The energy of hydrogen atom in nth orbit is En then the energy in nth orbit of singly ionised helium atom will be2001 · Q145 · MCQ
  78. Energy released in nuclear fission is due to2001 · Q146 · MCQ
  79. Nuclear fission is best explained by2000 · Q139 · MCQ
  80. When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be2000 · Q140 · MCQ
  81. Maximum frequency of emission is obtained for the transition2000 · Q141 · MCQ