Canadian Council of Independent Laboratories (CCIL) Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The required depth and size for the capping recess/mould is essential for ensuring proper alignment and support of the specimen being tested. The correct choice specifies a depth of 5-12mm and a size that is 10-25mm larger than the specimen diameter. This range is appropriate as it accommodates variations in specimen sizes while allowing enough space for the capping material to effectively distribute loads and prevent localized stress during testing.

The depth of 5-12mm ensures that there is sufficient material above the specimen, which is crucial for achieving accurate and repeatable results in testing by providing adequate support. Meanwhile, the size being 10-25mm larger than the specimen diameter ensures that there is enough clearance to apply the capping material without interference or risk of damaging the specimen edges. This specification also helps maintain stability and facilitates the proper encasement of the specimen, which is vital during testing procedures.

In contrast to the correct choice, other options may suggest depths or sizes that are either insufficient or excessive, which could compromise the effectiveness of the capping process. Therefore, the selection of depth and size in option B aligns with established best practices in capping procedures to ensure reliability and validity in test outcomes.