Electrical Conductors and Semiconductor Devices Quiz
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Questions and Answers

What happens to the resistance of a semiconductor when a trivalent impurity is added?

  • Decreases
  • Remains the same
  • Becomes zero
  • Increases (correct)
  • What is responsible for conduction in semiconductors?

  • Electrons (correct)
  • Both electrons and neutrons
  • Neutrons
  • Holes
  • How many terminals does a PN junction diode have?

  • 1
  • 2 (correct)
  • 3
  • 4
  • What symbol represents the anode terminal of a PN junction diode?

    <ul> <li></li> </ul> Signup and view all the answers

    What happens to the resistance of a pure semiconductor when it is heated?

    <p>Goes down</p> Signup and view all the answers

    What does the addition of a pentavalent impurity to a semiconductor create?

    <p>Free electrons</p> Signup and view all the answers

    In semiconductor manufacturing, what is the process of drawing a circuit design onto a wafer called?

    <p>Photolithography</p> Signup and view all the answers

    What is the glass substrate with a computer-designed circuit pattern called in semiconductor manufacturing?

    <p>Photomask</p> Signup and view all the answers

    Which of the following processes in semiconductor manufacturing involves spraying oxygen or water vapor on the wafer surface to form an oxide film?

    <p>Oxidation</p> Signup and view all the answers

    When chemical solutions are used for etching in semiconductor manufacturing, what is this process called?

    <p>Wet etching</p> Signup and view all the answers

    Which term best describes the resultant silicon rod after the semiconductor manufacturing process?

    <p>Ingot</p> Signup and view all the answers

    What type of etching uses gas or plasma for material removal in semiconductor manufacturing?

    <p>Dry etching</p> Signup and view all the answers

    What is the type of semiconductor material that has an equal number of electrons and holes?

    <p>Intrinsic</p> Signup and view all the answers

    What is the minimum voltage required to produce a large forward current in a silicon diode?

    <p>0.7 V</p> Signup and view all the answers

    Which of the following materials has the highest thermal conductivity?

    <p>Silver</p> Signup and view all the answers

    What is the barrier potential of a silicon diode at room temperature?

    <p>0.7 V</p> Signup and view all the answers

    Which of the following elements has four valence electrons and is classified as an elemental semiconductor?

    <p>Germanium (Ge)</p> Signup and view all the answers

    Why is copper preferred over silver for making conducting wires?

    <p>Copper is cheaper than silver</p> Signup and view all the answers

    What is the charge of a hole in a semiconductor?

    <p>A charge of +1 unit</p> Signup and view all the answers

    How many protons are there in the nucleus of a copper atom?

    <p>29</p> Signup and view all the answers

    What causes the holes in an intrinsic semiconductor at room temperature?

    <p>Thermal energy</p> Signup and view all the answers

    What is the merging of a free electron and a hole called?

    <p>Recombination</p> Signup and view all the answers

    How does an intrinsic silicon crystal act at room temperature?

    <p>Like a conductor</p> Signup and view all the answers

    What is the valence electron of a conductor also called?

    <p>Free electron</p> Signup and view all the answers

    What is the movement of free electrons in a conductor called?

    <p>Current</p> Signup and view all the answers

    What is the boundary between p-type material and n-type material called?

    <p>A pn junction</p> Signup and view all the answers

    As the forward current through a silicon diode increases, what happens to the internal resistance?

    <p>It decreases</p> Signup and view all the answers

    What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?

    <p>Recombination</p> Signup and view all the answers

    What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon?

    <p>Pentavalent</p> Signup and view all the answers

    Which factor(s) does the barrier potential of a pn junction depend on?

    <p>All of the above</p> Signup and view all the answers

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