Semiconductor MCQ 1

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Questions and Answers

What is the main factor responsible for the change in resistance of a semiconductor with increasing temperature?

  • Addition of small amounts of another element
  • Movement of charges
  • Type of semiconductors
  • Thermal agitation breaking bonds (correct)

What happens to the resistance of a thermistor as the temperature increases?

  • Remains constant
  • Fluctuates unpredictably
  • Decreases rapidly (correct)
  • Increases rapidly

Which type of semiconductors add more free positive holes available for conduction?

  • P type (e.g. Boron and Silicon) (correct)
  • Intrinsic semiconductors
  • N type (e.g. Phosphorus and silicon)
  • Extrinsic semiconductors

What is the function of a light-dependent resistor (LDR)?

<p>Decreases resistance when light shines on it (C)</p> Signup and view all the answers

What do N type semiconductors (e.g. Phosphorus and silicon) add more of for conduction?

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

What is the process of adding small amounts of another element to a pure semiconductor to increase its conductivity called?

<p>Doping (B)</p> Signup and view all the answers

What is the movement of charges through a doped semiconductor referred to as?

<p>Extrinsic conduction (B)</p> Signup and view all the answers

What kind of charge carriers can move across a P-N junction when it is formed?

<p>Both holes and electrons (D)</p> Signup and view all the answers

When a semiconductor diode is connected in forward bias, what is required for current to flow?

<p>Depletion layer to contain free majority charge carriers (B)</p> Signup and view all the answers

Which type of biasing allows a diode to act as an insulator?

<p>Reverse bias (A)</p> Signup and view all the answers

What is the main function of a rectifier?

<p>To convert a.c. to d.c. (B)</p> Signup and view all the answers

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