The uncertainty of a single reading on a metre rule (smallest division 1 mm) is usually taken as:

  1. pm 1 mm (or pm 0.5 mm per end)
  2. pm 1 cm
  3. zero
  4. pm 0.01 mm
Answer

A) pm 1 mm (or pm 0.5 mm per end)

It is limited by the smallest division of the scale. SLO P-11-A-07 · Understanding

Physics MCQ · More Physical Quantities and Measurement MCQs · Practise