Test length should be determined by which factor?

• A. The availability of time
• B. The number of questions
• C. The learning objectives the test is intended to evaluate
• D. The instructor's preference

Answer: (C)

The length of a test is driven by the learning objectives it is meant to evaluate. The objectives define exactly what knowledge, skills, and abilities you need to measure, so you choose how many items and what cognitive tasks to include to adequately cover those goals. If the objectives span multiple topics or require higher-order thinking, you need enough questions to represent each objective and the needed levels of sophistication, which also helps yield reliable results. Too few items or too narrowly focused questions can leave gaps and undermine validity, while too many items can waste time and cause fatigue without adding meaningful information. Time constraints matter for practicality, but they should not determine what you test—they should shape how many items you can reasonably include while still faithfully sampling the objectives.