One type of question that helps is one that has multiple correct answers. Of course, if you use a question like this, you should make sure students understand more than one choice can be considered correct, and that the learning management system (LMS) can handle it. Here is an example:
What is 8?
This type of question helps to distinguish a real case of cheating from the “good student artifact”, especially if the choices are also randomized within a question. The reason is simple: the chances of a student picking “it is an even number” should be approximately the same as that of “it is a power of 2”. As a result, even if the entire class get this question right, the chances that two students pick the same correct answer is only 0.5.