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Spot the odd one out

Exercise and reference answers

Questions
  1. Items
    1. Silicon
    2. Aluminium
    3. Germanium
    Odd item
    Aluminium
  2. Items
    1. Gallium arsenide
    2. Cadmium sulphide
    3. Sodium chloride
    Odd item
    Sodium chloride
  3. Items
    1. Neutron
    2. Electron
    3. Hole
    Odd item
    Neutron

Explanation

One item is not a semiconductor material. Source: syllabus Physics, Ch 14 Semiconductor Electronics.
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