Worksheet: Diodes

In this worksheet, we will practice describing how diodes work and identifying materials used in their construction.

Q1:

Which of the following materials is a semiconductor that is often used to make diodes?

  • ANeon
  • BLithium
  • CSilicon
  • DCopper
  • EIridium

Q2:

Which of the following correctly describes a p-type semiconductor?

  • AA p-type semiconductor is a semiconductor material that contains an impurity such that there are fewer free electrons in the material than there would be in the pure semiconductor.
  • BA p-type semiconductor is a semiconductor material that carries a net positive charge.
  • CA p-type semiconductor is a semiconductor made from an element in period 3 of the periodic table.
  • DA p-type semiconductor is a semiconductor material that contains an impurity such that there are more free electrons in the material than there would be in the pure semiconductor.
  • EA p-type semiconductor is a semiconductor material that carries a net negative charge.

Q3:

Which of the following correctly describes a diode?

  • AA diode is an electronic component with a resistance that changes depending on how much light is incident upon it.
  • BA diode is an electronic component that only allows current to flow in one direction through it.
  • CA diode is an electronic component that can be used to amplify electronic signals.
  • DA diode is an electronic component that emits light with a very high efficiency.
  • EA diode is an electronic component with a resistance that changes depending on the ambient temperature.

Q4:

Which of the following correctly describes an n-type semiconductor?

  • AAn n-type semiconductor is a semiconductor made from an element in period 5 of the periodic table.
  • BAn n-type semiconductor is a semiconductor material that carries a net negative charge.
  • CAn n-type semiconductor is a semiconductor made from an element in period 4 of the periodic table.
  • DAn n-type semiconductor is a semiconductor material that contains an impurity such that there are more free electrons in the material than there would be in the pure semiconductor.
  • EAn n-type semiconductor is a semiconductor material that contains an impurity such that there are fewer free electrons in the material than there would be in the pure semiconductor.

Q5:

A 𝑝 - 𝑛 junction consists of 2 different types of semiconductors: a 𝑝 -type semiconductor and an 𝑛 -type semiconductor. The 𝑝 -type semiconductor has free electrons than a pure semiconductor, and the 𝑛 -type semiconductor has free electrons than a pure semiconductor. Where the 𝑝 -type and 𝑛 -type semiconductors are joined, electrons from the semiconductor recombine with electron holes from the semiconductor, creating a region between the two materials which acts as a/an .

  • Amore, fewer, 𝑛 -type, 𝑝 -type, insulator
  • Bfewer, more, 𝑝 -type, 𝑛 -type, conductor
  • Cfewer, more, 𝑛 -type, 𝑝 -type, insulator
  • Dfewer, more, 𝑝 -type, 𝑛 -type, insulator
  • Emore, fewer, 𝑛 -type, 𝑝 -type, conductor

Q6:

The graph shows the 𝐼 - 𝑉 characteristics of a diode.

At which of the points marked on the graph is the resistance of the diode highest?

  • A 𝑇
  • B 𝑄
  • C 𝑆
  • D 𝑃

At which of the points marked on the graph is the resistance of the diode lowest?

  • A 𝑄
  • B 𝑃
  • C 𝑇
  • D 𝑆

Q7:

Which of the following circuit symbols represents a diode?

  • A
  • B
  • C
  • D
  • E

Q8:

Which of the following diagrams correctly shows which way a current can flow through a diode?

  • A
  • B

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