Which glassware is moderately precise?

• A. Beaker
• B. Erlenmeyer flask
• C. Volumetric flask
• D. Graduated cylinder

Answer: (D)

Precision in glassware comes from how finely it’s marked and how it’s intended to be used. A graduated cylinder is designed for reading volumes with moderate precision because it has many fine markings along its length and a relatively narrow body that makes the meniscus easier to read accurately. Beakers and Erlenmeyer flasks have rougher graduations and shapes that introduce larger reading uncertainty, so they’re more about approximate volumes. Volumetric flasks are calibrated for a single, exact volume and therefore offer the highest precision among these options, but they’re used when you need a very precise, specific volume rather than general measurements. So for a task described as moderately precise, the graduated cylinder provides the best balance of readability and practicality. Remember to read the bottom of the meniscus at eye level and choose a size close to the expected volume to minimize uncertainty.