How many Questions are Enough

Most of the time, I think the correct answer is "none." Quiz questions tend to focus on the bottom two levels of Bloom's taxonomy: Remembering and Understanding. But usually, for the training to be useful, it has to train people to do something.

If your course is teaching me how to correctly dispose of hazardous waste, then asking me a bunch of questions about various aspect of the process doesn't really give you a clear sense of whether or not I can actually do it correctly in the real world.

Instead, your course should put me in various situations where I have hazardous waste I need to dispose of. It should then allow me to make decisions at every step that allow me to demonstrate that I can complete the entire process correctly for the waste I need to dispose of.

Using this approach, most of the course is a "quiz" and no fact-based questions are necessary. You know I am able to correctly dispose of the waste by the end of the course, because in order to get to the end of the course, I had to demonstrate my ability to correctly dispose of the waste.

This is true for anything your course is teaching. Are you teaching interviewing skills? Then your course should ask me to interview several people. Are you teaching me how to complete a performance review? Then you should make me a manager of 3-4 employees and have me write up their performance reviews.

You get the idea. I should be practicing whatever you're teaching me during most of the course. If I'm doing that, you have most of the course to give me feedback about my performance. This will give you a much better assessment of my skills than any typical end-of-course set of quiz questions.