Arduino questions
To be more useful online (or in general), you (we?) should design a set of "multiple choice" answers for each question. A good set of multiple choice answers (which are harder to design than you might think.)
For additional usefulness, figure out how to randomize questions/answers so that if you take the test again, the answers will be different.
(Hmm. Does anyone know of sites that let you generate and provide "online quizzes"? I've seen some good quizzes on EdX and Coursera a similar, bit I'm pretty sure they don't allow just anyone to generate classes...)