This article talks about important characteristics of a good question paper.
Characteristic # 1. Reliability:
The test should give similar results even though different testers administrate it, different people scores in different forms of the test are given and the same person takes that test at two or more different times.
Characteristic # 2. Validity:
The test must really measure what it has been designed to measure.
Characteristic # 3. Objectivity:
A test is objective when it makes for the elimination of the scorer’s personal opinion bias judgment.
Characteristic # 4. Usability:
The test must have practical value from time, economy, and administration point of view.