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MHT-CET Semiconductors — practice questions

Explore 49 free Semiconductors questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Semiconductors questions and exercises with answers

Showing questions 1–30 of 49.

Electrical conductivity of a semiconductor lies in which range?Read the answer and worked solution →What is the process of adding controlled impurities to a pure semiconductor called?Read the answer and worked solution →After silicon, which is the second most common semiconductor material?Read the answer and worked solution →In a metal, how does conductivity change as the temperature rises?Read the answer and worked solution →Doping with Group III elements makes the dopants behave as what?Read the answer and worked solution →In which year was the transistor invented, following developments in quantum physics?Read the answer and worked solution →The integrated circuit was invented in which year?Read the answer and worked solution →How many valence electrons does each atom of pure silicon have?Read the answer and worked solution →How many valence electrons do Group V dopant atoms have?Read the answer and worked solution →Group III elements doped into silicon function as acceptors because they have how many valence electrons?Read the answer and worked solution →How does the band gap of an intrinsic semiconductor compare with that of an insulator?Read the answer and worked solution →The band of states lying above the band gap is called the what?Read the answer and worked solution →How can an insulator be made to conduct, in terms of its temperature?Read the answer and worked solution →What is the creation of a free electron and a hole by radiation or heat called?Read the answer and worked solution →For the purposes of electric current, a hole behaves like what?Read the answer and worked solution →A completely full valence band has what effect on current?Read the answer and worked solution →In an n-type semiconductor, which carriers are the majority carriers?Read the answer and worked solution →The term n-type comes from what?Read the answer and worked solution →The term p-type refers to the positive charge of what?Read the answer and worked solution →A common dopant used to make n-type silicon is which element?Read the answer and worked solution →How is an NPN transistor built from semiconductor layers?Read the answer and worked solution →What do bipolar junction transistors (BJT) do to a current?Read the answer and worked solution →Group IV atoms in a III-V compound can act as both donors and acceptors. They are called what?Read the answer and worked solution →A pure semiconductor with no added impurity is called what?Read the answer and worked solution →Which technique can accurately position doped regions in a semiconductor body?Read the answer and worked solution →Excited electrons that relax by emitting light are used in which semiconductor device?Read the answer and worked solution →A diode is an electronic component with how many terminals?Read the answer and worked solution →Converting alternating current to direct current using a diode is called what?Read the answer and worked solution →A diode's one-way behaviour has which hydraulic analog?Read the answer and worked solution →Who discovered asymmetric conduction across a crystal and metal contact in 1874?Read the answer and worked solution →

Worked practice questions

Electrical conductivity of a semiconductor lies in which range?

  1. Above that of a metal
  2. Below that of an insulator
  3. Equal to that of an insulator
  4. Between conductor and insulator
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Correct answer: D. Between conductor and insulator

A semiconductor conducts better than an insulator but worse than a good conductor, so its conductivity sits in between.

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What is the process of adding controlled impurities to a pure semiconductor called?

  1. Annealing
  2. Sintering
  3. Etching
  4. Doping
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Correct answer: D. Doping

Deliberately adding a small amount of impurity atoms to a crystal to change its conductivity is called doping.

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After silicon, which is the second most common semiconductor material?

  1. Carbon dioxide
  2. Tungsten carbide
  3. Copper oxide
  4. Gallium arsenide
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Correct answer: D. Gallium arsenide

Gallium arsenide is widely used in laser diodes, solar cells and microwave circuits, making it second to silicon.

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More Physics topics

ElectrostaticsCurrent ElectricityOscillationsElectromagnetic InductionKinetic Theory of GasesMechanical Properties of FluidsAtomsWave Optics