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
  • DIridium
  • ECopper

Q2:

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

  • AA p-type semiconductor is a semiconductor material that carries a net negative charge.
  • BA p-type semiconductor is a semiconductor material that carries a net positive charge.
  • CA 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.
  • 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 made from an element in period 3 of the periodic table.

Q3:

Which of the following correctly describes a diode?

  • AA diode is an electronic component that emits light with a very high efficiency.
  • 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 with a resistance that changes depending on the ambient temperature.
  • EA diode is an electronic component with a resistance that changes depending on how much light is incident upon it.

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

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 .

  • Afewer, more, n-type, p-type, insulator
  • Bfewer, more, p-type, n-type, insulator
  • Cmore, fewer, n-type, p-type, conductor
  • Dfewer, more, p-type, n-type, conductor
  • Emore, fewer, n-type, p-type, insulator

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?

  • A𝑆
  • B𝑃
  • C𝑄
  • D𝑇

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

  • A𝑃
  • B𝑆
  • C𝑇
  • D𝑄

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

Q9:

The diagram shows a circuit containing several diodes and bulbs. All of the bulbs are connected in parallel with the cell. Which of the bulbs, if any, are lit?

  • ABulb 1
  • BBulb 2
  • CBulb 1 and bulb 2
  • DBulb 3
  • ENone of the bulbs are lit.

Q10:

The diagram shows a circuit containing several diodes and resistors. All of the resistors are connected in parallel with the cell. Through which resistors, if any, is the current nonzero?

  • A𝑅
  • B𝑅
  • C𝑅 and 𝑅
  • D𝑅
  • ENone of the resistors have a nonzero current.

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