Electronics - Introduction To Semiconductor Theory

49 Questions | Total Attempts: 735

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Semiconductor Quizzes & Trivia

This includes semiconductor theory and diodes.


Questions and Answers
  • 1. 
    Every known element has
    • A. 

      The same type of atoms

    • B. 

      the same number if atoms

    • C. 

      A unique type of atom

    • D. 

      Several different types of atoms

  • 2. 
    An atom consists of
    • A. 

      One nucleus and only one electron

    • B. 

      One nucleus and one or more electrons

    • C. 

      Protons, electrons, and neutrons

    • D. 

      Answers (b) and (c)

  • 3. 
    The nucleus of an atom is made up of
    • A. 

      Protons and neutrons

    • B. 

      Electrons

    • C. 

      Electrons and protons

    • D. 

      Electrons and neutrons

  • 4. 
    The atomic number of silicon is
    • A. 

      8

    • B. 

      2

    • C. 

      4

    • D. 

      14

  • 5. 
    The atomic number of germanium is
    • A. 

      8

    • B. 

      2

    • C. 

      4

    • D. 

      32

  • 6. 
    The valence shell in a silicon atom has the number designation of
    • A. 

      0

    • B. 

      1

    • C. 

      2

    • D. 

      3

  • 7. 
    Valence electrons are
    • A. 

      In the closest orbit to the nucleus

    • B. 

      In the most distant orbit from the nucleus

    • C. 

      In various orbits around the nucleus

    • D. 

      Not associated with a particular atom

  • 8. 
    A positive ion is formed when
    • A. 

      A valence electron breaks away from the atom

    • B. 

      there are more holes than electrons in the outer orbit

    • C. 

      Two atoms bond together

    • D. 

      An atom gains an extra valence electron

  • 9. 
    The most widely used semiconductive material in electronic devices is
    • A. 

      Germanium

    • B. 

      Carbon

    • C. 

      Copper

    • D. 

      Silicon

  • 10. 
    The energy band in which free electrons exist is the  
    • A. 

      First band

    • B. 

      Second band

    • C. 

      Conduction band

    • D. 

      Valence band

  • 11. 
    Electron-hole pairs are produced by
    • A. 

      Recombination

    • B. 

      Thermal energy

    • C. 

      Ionization

    • D. 

      Doping

  • 12. 
    Recombination is when
    • A. 

      An electron falls into a hole

    • B. 

      A positive and a negative ion bond together

    • C. 

      A valence electron becomes a conduction electron

    • D. 

      A crystal is formed

  • 13. 
    In a semiconductor crystal, the atoms are held together by
    • A. 

      The interaction of valence electrons

    • B. 

      Forces of attraction

    • C. 

      Covalent bonds

    • D. 

      Answers (A), (B), and (C)

  • 14. 
    Each atom  in a silicon crystal has
    • A. 

      Four valence electrons

    • B. 

      Four conduction electrons

    • C. 

      Eight valence electrons, four of its own and four shared

    • D. 

      No valence electrons because all are shared with other atoms

  • 15. 
    The current in a semiconductor is produced by
    • A. 

      Electron only

    • B. 

      Holes only

    • C. 

      Negative ions

    • D. 

      Both electrons and holes

  • 16. 
      In an intrinsic semiconductor,
    • A. 

      There are no free electrons

    • B. 

      The free electrons are thermally produced

    • C. 

      There are only holes

    • D. 

      There are many electrons as there are holes

    • E. 

      Answers (B) and (D)

  • 17. 
    The difference between an insulator and a semiconductor is
    • A. 

      A wider energy gap between the valence band and the conduction band

    • B. 

      The number of free electrons

    • C. 

      The atomic structure

    • D. 

      Answers (A), (B), and (C)

  • 18. 
      The process of adding an impurity to an intrinsic semiconductor is called
    • A. 

      Doping

    • B. 

      Recombination

    • C. 

      Atomic modification

    • D. 

      Ionization

  • 19. 
    The trivalent impurity is added to silicon to create
    • A. 

      Germanium

    • B. 

      A p-type semiconductor

    • C. 

      An n-type semiconductor

    • D. 

      A depletion region

  • 20. 
    The purpose of pentavalent impurity is to
    • A. 

      Reduce the conductivity of silicon

    • B. 

      Increase the number of holes

    • C. 

      Increase the number of free electrons

    • D. 

      Create minority carriers

  • 21. 
    The majority carriers in an n-type semiconductor are
    • A. 

      Holes

    • B. 

      Valence electrons

    • C. 

      Conduction electrons

    • D. 

      Protons

  • 22. 
    Holes in an n-type semiconductor are
    • A. 

      Minority carriers that are thermally produced

    • B. 

      Minority carriers that are produced by doping

    • C. 

      Majority carriers that are thermally produced

    • D. 

      Majority carriers that are produced by doping

  • 23. 
    A pn junction is formed by
    • A. 

      The recombination of electrons and holes

    • B. 

      Ionization

    • C. 

      The boundary of a p-type and an n-type material

    • D. 

      The collision of a proton and a neutron

  • 24. 
    The depletion region is created by
    • A. 

      Ionization

    • B. 

      Diffusion

    • C. 

      Recombinations

    • D. 

      Answers (A), (B), and (C)

  • 25. 
    The depletion region consists of
    • A. 

      Nothing but minority carriers

    • B. 

      Positive and negative ions

    • C. 

      No majority carriers

    • D. 

      Answers (B) and (C)