Atoms And Nuclei Quiz

20 Questions

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Atoms And Nuclei Quiz

This quiz is multiple choice which tests the participants’ conceptual knowledge about the topic 'Atoms and Nuclei'. The questions involve knowledge from four main sections including; The Structure of the Atom, The Structure of the Nucleus, Radioactivity and Nucleur Fission and Fusion.


Questions and Answers
  • 1. 
    Planck's constant has a value of 
    • A. 

      6.626 × 10^-34

    • B. 

      1.055 × 10^34

    • C. 

      8.988 × 10^-16

    • D. 

      8.85 × 10^26

  • 2. 
    A photon is a particle that 
    • A. 

      Cannot travel in a vacuum.

    • B. 

      Has zero electric charge.

    • C. 

      Has zero electric field associated with it.

    • D. 

      Has a velocity in a vacuum that varies with the photon frequency.

  • 3. 
    What is the ionization energy of the neutral hydrogen atom?
    • A. 

      6.8 eV

    • B. 

      13.6 eV

    • C. 

      27.2 eV

    • D. 

      None of the given answers

  • 4. 
    The wavelength of a ruby laser is 694.3 nm.  What is the energy difference between the two energy states involved in laseraction?
    • A. 

      1.812 eV

    • B. 

      1.646 eV

    • C. 

      1.537 eV

    • D. 

      1.786 eV

  • 5. 
    An atom's atomic number is determined by the number of
    • A. 

      Neutrons in its nucleus.

    • B. 

      Alpha particles in its nucleus.

    • C. 

      Protons in its nucleus.

    • D. 

      Nucleons in its nucleus.

  • 6. 
    If an atom's atomic number is given by Z, its atomic mass by A, and its neutron number by N, which of the following is correct?
    • A. 

      N = Z - A

    • B. 

      N = A - Z

    • C. 

      N = A + Z

    • D. 

      None of the given answers

  • 7. 
    There is a limit to the size of a stable nucleus because of 
    • A. 

      The limited range of the strong nuclear force.

    • B. 

      The weakness of the gravitational force.

    • C. 

      The weakness of the electrostatic force.

    • D. 

      None of the given answers

  • 8. 
    When nucleons join to form a stable nucleus, energy is
    • A. 

      Absorbed.

    • B. 

      Not transferred.

    • C. 

      Destroyed.

    • D. 

      Released.

  • 9. 
    The binding energy per nucleon
    • A. 

      Decreases steadily as we go to heavier elements.

    • B. 

      Has a maximum near iron in the periodic table.

    • C. 

      Is approximately constant throughout the periodic table, except for very light nuclei.

    • D. 

      Increases steadily as we go to heavier elements.

  • 10. 
    An alpha particle will be attracted to a 
    • A. 

      Proton.

    • B. 

      Gamma ray.

    • C. 

      Positive charge.

    • D. 

      Negative charge.

  • 11. 
    When a gamma ray is emitted from an unstable nucleus,
    • A. 

      The number of neutrons drops by one and the number of protons increases by one.

    • B. 

      There is no change in either the number of neutrons or the number of protons.

    • C. 

      The number of neutrons and the number of protons drop by two.

    • D. 

      None of the given answers

  • 12. 
    The atomic number and mass number for calcium 39 are 20 and 39, respectively.  How many protons are in one atom?
    • A. 

      20

    • B. 

      39

    • C. 

      1

    • D. 

      19

  • 13. 
    If 4.0 × 1018 atoms decay with a half-life of 2.3 years, how many are remaining after 3.7 years?
    • A. 

      1.1 ×1018

    • B. 

      1.3 × 1018

    • C. 

      2.5 × 1018

    • D. 

      1.7 × 1018

  • 14. 
    In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum? 
    • A. 

      Atomic number

    • B. 

      Nucleon number

    • C. 

      Neutron number

    • D. 

      None of the given answers

  • 15. 
    A nuclear reaction is said to be exothermic if the total kinetic energy is
    • A. 

      Zero after the reaction.

    • B. 

      Equal both before and after the reaction

    • C. 

      Less after the reaction than before.

    • D. 

      . greater after the reaction than before.

  • 16. 
    The fuel for nuclear fission is
    • A. 

      He.

    • B. 

      U.

    • C. 

      H.

    • D. 

      Any radioactive material.

  • 17. 
    What is the meaning of the term "critical mass"?
    • A. 

      This refers to the minimum amount of fissionable material required to sustain a chain reaction.

    • B. 

      This refers to the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium.

    • C. 

      This is the material which is just on the verge of becoming radioactive.

    • D. 

      This is the amount of mass needed to make a power reactor economically feasible.

  • 18. 
    What is necessary to stop beta particles?
    • A. 

      Metal foil

    • B. 

      Air alone

    • C. 

      Paper

    • D. 

      Thick metal

  • 19. 
    The fission reaction 235U + 1n → 141Ba + 92Kr + neutrons, the number of neutrons produced is 
    • A. 

      1

    • B. 

      Zero

    • C. 

      3

    • D. 

      2

  • 20. 
    What is the energy released (positive) or absorbed (negative) in the following reaction?  3H (3.016049)  +   3H  (3.016049)    =   4He (4.002603)   +    2(1n) (1.008665)                                        
    • A. 

      0.0122 MeV

    • B. 

      -11.3 MeV

    • C. 

      -0.0122 MeV

    • D. 

      11.3 MeV