Electronic Devices and Circuits MCQs with answers Page - 48

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Q. To obtain the P-type semiconductor ?

  • (A) A pentavalent Impurity is added
  • (B) A trivalent Impurity is added
  • (C) Both are added
  • (D) None of these

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Q. The bond formed by sharing of electrons by two or more atoms is called ?

  • (A) lonic Bond
  • (B) Metallic Bond
  • (C) Covalent Bond
  • (D) Coordinate Bond

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Q. At room temperature semiconductor material is a ?

  • (A) perfect insulator
  • (B) superconducting
  • (C) conducting
  • (D) slightly conducting

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Q. A semiconductor device made out of a material having very high temperature coefficient of resistance is ?

  • (A) Transistor
  • (B) Varistor
  • (C) Thyristor
  • (D) Thermistor

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Q. Generally, mobility of electrons in semi conductors is ............ times the mobility of holes ?

  • (A) two
  • (B) three
  • (C) four
  • (D) five

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Q. The process of deliberately adding impurities to a semiconductor is known as ?

  • (A) Combining
  • (B) Keying
  • (C) Sintering
  • (D) Doping

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Q. In N-type material. majority carriers would be ?

  • (A) dopants
  • (B) electrons
  • (C) holes
  • (D) slower

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Q. How many electrons are there in the valence orbit of a silicon atom within a crystal ?

  • (A) 8
  • (B) 4
  • (C) 14
  • (D) 1

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Q. Elements with 1. 2 or 3 valence electrons usually make excellent ?

  • (A) neutral
  • (B) semiconductor
  • (C) insulator
  • (D) conductor

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