A type of intelligence test in which the difficulty level of questions…

Educational and psychological tests are often classified along two independent dimensions: the CONTENT or medium of the items (verbal versus non-verbal or performance-based), and the STRUCTURE of administration with respect to item difficulty and time. Under the difficulty-time dimension, a power test arranges items in increasing order of difficulty and keeps the time limit generous or secondary, so the score mainly reflects how difficult a problem a person can solve. A speed test, by contrast, uses items of roughly uniform difficulty administered under a strict time limit, so the score mainly reflects how quickly a person can work.

The stem describes a test whose question difficulty gradually increases while the time factor is kept secondary — this is exactly the defining structural feature of a power test.

• Verbal Test: classifies a test by the medium of its items (language-based content), not by how difficulty is sequenced or how time is weighted, so it does not describe this structural criterion at all.

• Speed Test: the opposite structure — items are of similar difficulty, but a strict time limit is imposed, so it does not match a difficulty ladder with time held secondary.

• Performance Test: also classifies a test by the task type (practical, non-verbal, hands-on activities), not by the difficulty-time structure — the same category mismatch as a verbal test.

Therefore, the test described — difficulty increasing gradually with time as a secondary factor — is a Power Test.