Semiconductor Theory MCQ

Test your knowledge with important Semiconductor Theory MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Semiconductor Theory MCQs at Bissoy

• An n-type semiconductor is
  ক

  Positively charged

  খ

  Negatively charged

  গ

  Electrically neutral

  ঘ

  None of the above
• The most commonly used semiconductor is ___________
  ক

  Germanium

  খ

  Silicon

  গ

  Carbon

  ঘ

  Sulphur
• A reverse bias pn junction has ___________
  ক

  Very narrow depletion layer

  খ

  Almost no current

  গ

  Very low resistance

  ঘ

  Large current flow
• When a pure semiconductor is heated, its resistance ___________
  ক

  Goes up

  খ

  Goes down

  গ

  Remains the same

  ঘ

  Can?t say
• The leakage current across a pn junction is due to ___________
  ক

  Minority carriers

  খ

  Majority carriers

  গ

  Junction capacitance

  ঘ

  None of the above
• The random motion of holes and free electrons due to thermal agitation is called ___________
  ক

  Diffusion

  খ

  Pressure

  গ

  Ionisation

  ঘ

  None of the above
• A trivalent impurity has valence electrons
  ক

  4

  খ

  5

  গ

  6

  ঘ

  3
• In the depletion region of a pn junction, there is a shortage of
  ক

  Acceptor ions

  খ

  Holes and electrons

  গ

  Donor ions

  ঘ

  None of the above
• The barrier voltage at a pn junction for germanium is about
  ক

  5.0 V

  খ

  3.0 V

  গ

  Zero

  ঘ

  0.3 V
• When a pentavalent impurity is added to a pure semiconductor, it becomes
  ক

  An insulator

  খ

  An intrinsic semiconductor

  গ

  p-type semiconductor

  ঘ

  n-type semiconductor
• As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________
  ক

  Remains the same

  খ

  Increases

  গ

  Decreases

  ঘ

  None of the above
• In a semiconductor, current conduction is due to
  ক

  Only holes

  খ

  Only free electrons

  গ

  Holes and free electrons

  ঘ

  None of the above
• When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on
  ক

  Junction capacitance

  খ

  Minority carriers

  গ

  Majority carriers

  ঘ

  None of the above
• The leakage current in a pn junction is of the order of
  ক

  Aa

  খ

  mA

  গ

  kA

  ঘ

  µA
• A semiconductor is formed by bonds.
  ক

  Covalent

  খ

  Electrovalent

  গ

  Co-ordinate

  ঘ

  None of the above
• With forward bias to a pn junction , the width of depletion layer
  ক

  Decreases

  খ

  Increases

  গ

  Remains the same

  ঘ

  None of the above
• A hole in a semiconductor is defined as ___________
  ক

  A free electron

  খ

  The incomplete part of an electron pair bond

  গ

  A free proton

  ঘ

  A free neutron
• Addition of trivalent impurity to a semiconductor creates many
  ক

  Holes

  খ

  Free electrons

  গ

  Valence electrons

  ঘ

  Bound electrons
• Addition of pentavalent impurity to a semiconductor creates many
  ক

  Free electrons

  খ

  Holes

  গ

  Valence electrons

  ঘ

  Bound electrons
• A pn junction acts as a ___________
  ক

  Controlled switch

  খ

  Bidirectional switch

  গ

  Unidirectional switch

  ঘ

  None of the above
• At room temperature, an intrinsic silicon crystal acts approximately as
  ক

  A battery

  খ

  A conductor

  গ

  An insulator

  ঘ

  A piece of copper wire
• At absolute temperature, an intrinsic semiconductor has ___________
  ক

  A few free electrons

  খ

  Many holes

  গ

  Many free electrons

  ঘ

  No holes or free electrons
• At room temperature, an intrinsic semiconductor has ___________
  ক

  Many holes only

  খ

  A few free electrons and holes

  গ

  Many free electrons only

  ঘ

  No holes or free electrons
• A semiconductor has ___________ temperature coefficient of resistance.
  ক

  Positive

  খ

  Zero

  গ

  Negative

  ঘ

  None of the above
• A reverse biased pn junction has resistance of the order of
  ক

  Ω

  খ

  kΩ

  গ

  MΩ

  ঘ

  None of the above
• A forward biased pn junction diode has a resistance of the order of
  ক

  Ω

  খ

  kΩ

  গ

  MΩ

  ঘ

  None of the above
• A pentavalent impurity has ___________ Valence electrons
  ক

  3

  খ

  5

  গ

  4

  ঘ

  6
• A semiconductor has generally ___________ valence electrons.
  ক

  2

  খ

  3

  গ

  6

  ঘ

  4
• A hole and electron in close proximity would tend to ___________
  ক

  Repel each other

  খ

  Attract each other

  গ

  Have no effect on each other

  ঘ

  None of the above
• The impurity level in an extrinsic semiconductor is about of pure semiconductor.
  ক

  10 atoms for 108 atoms

  খ

  1 atom for 108 atoms

  গ

  1 atom for 104 atoms

  ঘ

  1 atom for 100 atoms