9th Class Science Structure of the Atom Question Bank

done Atomic Structure IIT JEE Objective Problems Total Questions - 40

• question_answer1)
                                  Cathode rays are made up of
  A)
   positively charged particles done clear
  B)
   negatively charged particles done clear
  C)
   neutral particles done clear
  D)
   none of these done clear
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• question_answer2)
  The value of Planck's constant is
  A)
   \[\text{6}.\text{6256}\times \text{1}{{0}^{-\text{27}}}\text{erg sec}\] done clear
  B)
   \[\text{66}.\text{256}\times \text{1}{{0}^{-\text{27}}}\text{ erg sec}\] done clear
  C)
   \[\text{6}.0\text{2}\times \text{1}{{0}^{-\text{15}}}\text{ erg sec}\]   done clear
  D)
   \[\text{3}.0\text{1}\times \text{l}{{0}^{-\text{23}}}\text{ erg sec}\] done clear
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• question_answer3)
  The electronic configuration 2, 8, 8, 2 represents the element
  A)
   argon                   done clear
  B)
   potassium done clear
  C)
   calcium                done clear
  D)
   chlorine done clear
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• question_answer4)
  Rutherford's experiment which established the nuclear model of the atom used a beam of
  A)
   \[\beta \]- particles which impinged on a metal foil and got absorbed done clear
  B)
   \[\gamma \]- rays which impinged on a metal foil and ejected electrons done clear
  C)
   Helium atoms, which impinged on a metal foil and got scattered done clear
  D)
   Helium nuclei, which impinged on a metal foil and got scattered done clear
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• question_answer5)
  A neutral atom of an element has a nucleus with a nuclear charge 13 times and mass 27 times that of hydrogen nucleus. How many electrons would be in its stable positively charged ion?
  A)
   27                                          done clear
  B)
   14    done clear
  C)
   13                                          done clear
  D)
   10 done clear
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• question_answer6)
  An element M has an atomic mass 19 and atomic number 9; its ions are represented by
  A)
   \[{{\text{M}}^{+}}\]  done clear
  B)
   \[{{\text{M}}^{2+}}\]   done clear
  C)
   \[{{\text{M}}^{-}}\]                       done clear
  D)
   \[{{\text{M}}^{\text{2}-}}\] done clear
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• question_answer7)
  When alpha rays are sent through a thin metal foil, most of them go straight through the foil because
  A)
   alpha rays are much heavier than electron rays done clear
  B)
   alpha rays are positively charged done clear
  C)
   alpha rays move with high velocity done clear
  D)
   most part of the atom is empty done clear
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• question_answer8)
  Rutherford's alpha ray scattering experiment eventually led to the conclusion that
  A)
   mass and energy are related done clear
  B)
   electrons occupy space around the nucleus done clear
  C)
   neutrons are buried deep in the nucleus done clear
  D)
   the point of impact with matter can be precisely determined done clear
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• question_answer9)
  Which of the following is not isoelectronic?
  A)
   \[\text{N}{{\text{a}}^{+}}\]                       done clear
  B)
   \[M{{g}^{2+}}\] done clear
  C)
   \[{{\text{O}}^{\text{2}-}}\]        done clear
  D)
   \[C{{l}^{-}}\] done clear
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• question_answer10)
  'Ca' has atomic number 20 and atomic weight 40. Which of the following statements is not correct about 'Ca' atom?
  A)
   The number of electrons is same as the number of neutrons done clear
  B)
   The number of nucleons is double the number of neutrons done clear
  C)
   The number of protons is half the number of neutrons done clear
  D)
   The number of nucleons is double the atomic number done clear
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• question_answer11)
  The radius of anatomic nucleus is close to
  A)
   \[{{10}^{-2}}cm\]                            done clear
  B)
   \[{{10}^{-5}}cm\] done clear
  C)
   \[{{10}^{-8}}cm\]                            done clear
  D)
   \[{{10}^{-12}}cm\] done clear
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• question_answer12)
  Which is not true with respect to cathode rays?
  A)
   A stream of electrons done clear
  B)
   Charged particles done clear
  C)
   Move with same speed as that of light done clear
  D)
   Can be deflected by magnetic fields done clear
  E)
   Can be deflected by electric fields done clear
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• question_answer13)
  Number of protons, neutrons and electrons in the element\[_{89}{{\text{X}}^{\text{231}}}\]is
  A)
   89, 89, 242                          done clear
  B)
   89, 142, 89 done clear
  C)
   89, 71, 89                            done clear
  D)
   89, 231, 89 done clear
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• question_answer14)
  A neutral atom (atomic number > (a) has
  A)
   electron and proton   done clear
  B)
   neutron and electron done clear
  C)
   neutron, electron and proton done clear
  D)
   neutron and proton done clear
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• question_answer15)
  The hydride ion is isoelectronic with
  A)
   \[{{\text{H}}^{+}}\]                        done clear
  B)
   \[\text{H}{{\text{e}}^{+}}\]   done clear
  C)
   He         done clear
  D)
   Be done clear
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• question_answer16)
  Ratio of mass of proton and electron is
  A)
   infinite                                 done clear
  B)
   \[\text{1}.\text{8}\times \text{1}{{0}^{\text{3}}}\] done clear
  C)
   1.8                         done clear
  D)
   none of these done clear
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• question_answer17)
  Which of the following statements is correct?
  A)
   the charge on an electron and on a proton are equal and opposite done clear
  B)
   neutron has no charge done clear
  C)
   electrons and protons have the same weight done clear
  D)
   the mass of proton and a neutron are nearly identical done clear
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• question_answer18)
  Anode rays were discovered by
  A)
   Goldstein           done clear
  B)
   Rutherford done clear
  C)
   GJ. Stoney                         done clear
  D)
   J.J. Thomson done clear
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• question_answer19)
  The charge on the atom having 17 protons, 18 neutrons and 18 electrons is
  A)
   +1                                          done clear
  B)
   -1    done clear
  C)
   -2                                           done clear
  D)
   zero done clear
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• question_answer20)
  Which pair is isoelectronic?   (AFMC 198(c)
  A)
   Ar and\[Cl\]      done clear
  B)
   \[\text{N}{{\text{a}}^{+}}\]and Ne done clear
  C)
   \[\text{N}{{\text{a}}^{+}}\]and Mg        done clear
  D)
   Mg and Ne done clear
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• question_answer21)
  Maximum number of electrons in any orbit is
  A)
   \[{{n}^{2}}\]                                      done clear
  B)
   \[2{{n}^{2}}\] done clear
  C)
   \[1/2{{n}^{2}}\]                               done clear
  D)
   none of these done clear
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• question_answer22)
  Experimental evidence for the existence of atomic nucleus comes from
  A)
   Millikan's oil drop method done clear
  B)
   Atomic absorption spectroscopy done clear
  C)
   The magnetic bending of cathode rays done clear
  D)
   Alpha rays scattering by a thin metal foil done clear
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• question_answer23)
  \[^{22}Na\]contains
  A)
   22 protons      done clear
  B)
   11 neutrons done clear
  C)
   22 neutrons       done clear
  D)
   none of these done clear
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• question_answer24)
  Which of the following atoms has no neutron in its nucleus?
  A)
   Helium                                 done clear
  B)
   Lithium done clear
  C)
   Protium                               done clear
  D)
   Tritium done clear
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• question_answer25)
  An element has atomic number 11 and mass number 24. What does the nucleus contain?
  A)
   11 protons and 13 neutrons done clear
  B)
   11 protons, 13 neutrons and 13 electrons done clear
  C)
   13 protons and 11 neutrons done clear
  D)
   13 protons and 11 electrons done clear
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• question_answer26)
  The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is
  A)
   2                                             done clear
  B)
   17    done clear
  C)
   37                                          done clear
  D)
   38 done clear
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• question_answer27)
  Which is different in isotopes of an element?
  A)
   Atomic number               done clear
  B)
   Mass number done clear
  C)
   Number of protons   done clear
  D)
   Number of electrons done clear
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• question_answer28)
  \[N{{a}^{+}}\]ion is isoelectronic with
  A)
   \[L{{i}^{+}}\]                                     done clear
  B)
   \[M{{g}^{+2}}\] done clear
  C)
   \[C{{a}^{2+}}\]                 done clear
  D)
   \[B{{a}^{2+}}\] done clear
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• question_answer29)
  Neutron is a fundamental particle carrying
  A)
   a charge of +1 and a mass of 1 unit done clear
  B)
   no charge and a mass of 1 unit done clear
  C)
   no charge and no mass done clear
  D)
   a charge of -1 and mass of 1 unit done clear
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• question_answer30)
  The number of electrons in the atom which has 20 protons in the nucleus is
  A)
   20                          done clear
  B)
   10    done clear
  C)
   30                                          done clear
  D)
   40 done clear
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• question_answer31)
  Number of electrons in the outermost orbit of the element of atomic number 15 is
  A)
   7                                             done clear
  B)
   5     done clear
  C)
   3                                             done clear
  D)
   2 done clear
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• question_answer32)
  The discovery of neutron became very late because
  A)
   neutrons are present in nucleus done clear
  B)
   neutrons are charge less done clear
  C)
   neutrons are fundamental particles done clear
  D)
   all done clear
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• question_answer33)
  The mass of the neutron is of the order of.
  A)
   \[\text{1}{{0}^{-\text{23}}}\text{ kg}\]                 done clear
  B)
   \[\text{1}{{0}^{-\text{24}}}\text{ kg}\] done clear
  C)
   \[\text{1}{{0}^{-\text{26}}}\text{ kg}\]                 done clear
  D)
   \[\text{1}{{0}^{-\text{27}}}\text{ kg}\] done clear
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• question_answer34)
  Cathode rays are
  A)
   electronegative waves                 done clear
  B)
   radiations done clear
  C)
   stream of a -particles done clear
  D)
   stream of electrons done clear
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• question_answer35)
  An atom of Mn, atomic number 25 and atomic weight 55 contains in its nucleus
  A)
   55 protons         done clear
  B)
   55 neutrons done clear
  C)
   25 neutrons       done clear
  D)
   25 protons done clear
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• question_answer36)
  Which is the correct statement about proton?
  A)
   proton is nucleus of deuterium done clear
  B)
   proton is a particle done clear
  C)
   proton is ionized hydrogen molecule done clear
  D)
   proton is ionized hydrogen atom done clear
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• question_answer37)
  Neutron was discovered by
  A)
   Rutherford                        done clear
  B)
   Langmuir done clear
  C)
   Chadwick            done clear
  D)
   Austin done clear
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• question_answer38)
  As we move away from nucleus, the energy of orbit
  A)
   decreases                          done clear
  B)
   increases done clear
  C)
   remains unchanged   done clear
  D)
   none of these done clear
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• question_answer39)
  The mass of atom is constituted mainly by
  A)
   neutrons and neutrions done clear
  B)
   neutrons and electrons done clear
  C)
   neutrons and protons done clear
  D)
   protons and electrons done clear
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• question_answer40)
  The electronic configuration of elements A, B, C and D are (2, 8, (a) (2, 8, (b) and (2, 8, 7) respectively. Which of them can make an ion with two negative charges.
  A)
   A                                            done clear
  B)
   B     done clear
  C)
   C                            done clear
  D)
   D done clear
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