The test works as a tool in order to measure students' level of knowledge. It also helps to adjust the learning material accordingly. validity, reliability, and objectivity are the characteristic of tests.Reliability: One of the most important criteria for the quality of measurement is the reliability of the measuring instrument. Reliability means consistency with which an instrument yields similar results.It concerns the extent to which a measurement of a phenomenon provides stable and accurate results. Reliability is concerned with consistency and replicability or with repeatability over time.A test is seen as being reliable when it can be used by a number of different researchers under stable conditions, with consistent results and the results not varying. It is important to remember that reliability is not measured, it is estimated.For instance, if a test is constructed to measure a particular trait, then each time it is administered, it should yield the same results.Hence, it could be concluded that reliability is correct in the context of the question.Additional Information Objectivity:Objectivity is an important characteristic of a good test. It affects both the validity and reliability of test scores. The objectivity of a measuring instrument means the degree to which different persons scoring the answer receipt arrive at the same result.It is the extent to which the instrument is free from personal error (personal bias), which is subjectivity on the part of the scorer.