Odd one out: what sets speed

Exercise and reference answers

Questions

1. Items

   1. Tension
   2. Mass density
   3. Colour
   4. Bulk modulus

   Odd item

   Colour

2. Items

   1. Metre
   2. Second
   3. Hertz
   4. Ampere

   Odd item

   Ampere

3. Items

   1. Electron
   2. Crest
   3. Trough
   4. Node

   Odd item

   Electron

Instructions

Tap the one that does not belong.

Explanation