If a measuring scale is marked every 0.2 units, this indicates a precision of:

• A. 0.1 units
• B. 0.2 units
• C. 0.05 units
• D. 0.3 units

Answer: (B)

The main idea is that the precision of a measuring scale comes from the smallest division it can reliably read. If the scale is marked every 0.2 units, you can measure to increments of 0.2 units. So the precision indicated by the scale itself is 0.2 units.

Why the other options don’t fit: reading to 0.1 or 0.05 units would require finer marks or a guaranteed ability to estimate between marks, which isn’t provided by a scale that only has 0.2-unit spacing. A precision of 0.3 units would be coarser than the smallest division shown, which isn’t consistent with what the scale can resolve.