A pressure air meter (used to measure air content of fresh concrete) must be calibrated by verifying the volume of the measuring bowl and the accuracy of the graduated neck/markings . This is done using water because water volume can be measured accurately and used to check the meter’s indicated graduations (air content scale) by filling the assembled unit to known levels. In Experiment Design for Civil Engineering , the calibration procedure directs filling the assembled air meter with water to the highest graduation mark and adding water in known increments to verify that the graduations are accurate throughout the range. The same source references using water to establish the mass/density) and to check calibration cups and neck readings. Therefore, the substance used to calibrate the air pres*, making Option B correct.

When inspection identifies nonconforming work relative to IFC drawings, the inspector/technologist’s role is to document the condition (location, description, measurements, photos) and notify the responsible design professional/engineer for disposition. This aligns with formal quality control/assurance processes: field staff identify and record deviations; the engineer evaluates structural implications and issues written instructions (accept as-is, remediate, redesign, or replace). Acting unilaterally to remove a beam (option B) exceeds typical authority and may create safety and contractual issues. Simply filing without notification (C) fails to address a potentially serious structural deficiency. Rechecking the IFC calculations (D) is not the immediate construction control action; the priority is to initiate an engineering review of the nonconformance. Civil engineering project practice stresses maintaining complete inspection records and communicating significant issues through appropriate channels for corrective action. Therefore, the correct action is document the issue and notify the engineer .

A beam supported at both ends and at an intermediate support is a continuous (statically indeterminate) beam . Under uniform loading, continuity over the interior support creates negative bending moment (hogging) at the middle support and redistributes shear and reactions compared with a simply supported span. Standard structural analysis references note that continuous beams are statically indeterminate and are analyzed using methods such as the three-moment equation to determine reactions and internal moments. For symmetric geometry and uniform load, the interior support typically attracts a larger share of the reaction because continuity restrains rotation and increases load transfer to the middle support. The end supports still carry reaction, but the redistribution generally results in the middle reaction being greater than either end reaction for the common case oh an intermediate support under uniform load. Thus, the correct statement is that the reactions are greater in the middle than at the ends .