What is the least possible error encountered when taking measurement with a metre rule?
- 1.1mm
-
0.5mm
- 0.2mm
- 0.1mm
The correct answer is: B
Explanation
A standard meter rule has markings that are usually every millimeter (1 mm). The least count, which is the smallest measurement that can be accurately read, is often 1 mm.
The least possible error is generally considered to be half of the smallest division, so it is ±0.05cm (or ±0.5mm).
There is an explanation video available .