Final answer:
The 'base rate' or 'floor effect' is the term used for the lowest point on an intelligence test where two consecutive items of equal difficulty can be passed by the test taker.
Step-by-step explanation:
When administering an intelligence test, the term for the lowest point on the test where the test taker can pass two consecutive items of equal difficulty is known as the 'base rate' or 'floor effect'. This term indicates the threshold below which the test may not accurately reflect the abilities or knowledge of the individual being tested. Intelligence tests like the WAIS-IV and WISC-V typically have a range of difficulties among the items, and ensuring that a test is able to measure the full range of abilities is crucial in obtaining an accurate assessment. It's part of the careful design and standardization of these tools to assess intellectual capabilities.