What type of questions may reduce the objectivity of a test?

Open-ended questions can reduce the objectivity of a test primarily due to the subjective nature of responses. Unlike structured question formats, open-ended questions allow for a wide range of answers, which can vary significantly in quality, depth, and content. This variability makes it challenging to grade answers consistently and impartially, potentially leading to biases based on the examiner's interpretation of the responses.

Such questions often require critical thinking and personal expression, which may lead to differing conclusions about what constitutes an adequate or correct response. Consequently, the lack of a definitive correct answer can result in discrepancies in scoring, which diminishes the reliability and objectivity of the assessment overall.

In contrast, the other types of questions, such as multiple choice, true or false, and matching questions, are generally designed to have clear, predetermined correct answers, making them easier to score objectively and consistently.