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Spot the one that does not belong

Exercise and reference answers

Questions
  1. Items
    1. Silicon
    2. Copper
    3. Germanium
    Odd item
    Copper
  2. Items
    1. Diode
    2. Transistor
    3. Lever
    Odd item
    Lever
  3. Items
    1. Protons
    2. Electrons
    3. Holes
    Odd item
    Protons

Explanation

One material is in a different class. Source: syllabus Physics, Ch 14 Semiconductor Electronics.
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