Spot the one that does not belong

Exercise and reference answers

Questions

1. Items

   1. a · b
   2. |a||b| cos θ
   3. a × b

   Odd item

   a × b

2. Items

   1. Unit vector
   2. Zero vector
   3. Null vector

   Odd item

   Unit vector

3. Items

   1. Coinitial
   2. Perpendicular
   3. Collinear

   Odd item

   Perpendicular

4. Items

   1. î
   2. λ
   3. ĵ
   4. k̂

   Odd item

   λ

Explanation