The slump of the concrete is measured and reported to the nearest ____.

• A. 1/4 inch
• B. 1/2 inch
• C. 1/8 inch
• D. 1 inch

Answer: (A)

The slump test measures how much the concrete settles when the cone is removed, which tells you how workable or flowable the mix is. That measurement is reported to the nearest quarter inch because this level of precision matches what the test can reliably produce in the field. Factors like tamping, cone removal, surface finish, temperature, and moisture content introduce variability, so finer measurements (like eighths or halves of an inch) aren’t reliably reproducible, while a full inch would hide meaningful differences in workability. Reporting to the nearest 1/4 inch gives enough detail to compare mixes and make adjustments without implying a false sense of precision.