Which of the following would be a source of uncertainty on a ruler?

Question

answers:
The ruler can't be made long enough to keep marking smaller and smaller increments of measurement

The plastic of the ruler is not sturdy enough to keep marking smaller measurements

The ruler is not in the correct units for small values

The object being measured is too rough to get closer measurements

Answer 1

The main source of uncertainty among the options provided is:

The object being measured is too rough to get closer measurements.

When measuring an object with a rough surface, it's difficult to determine an exact measurement because the variances in the surface texture can lead to inconsistencies in where you place the ruler or how you read the measurement, resulting in greater uncertainty.

The other options pertain to the ruler itself but do not directly address the measurement process in terms of an inherent uncertainty.