Moodle Question Bank is a feature that allows a teacher to simply create, preview, as well as edit questions in a particular database of question categories. Question categories may be limited to being used on sites, courses or even quiz levels. Questions in a category may be added to a lesson activity or a quiz via an export process. Teachers usually enter the question bank by simply creating or even editing a quiz activity or via the settings>course administration>question bank.
See on www.super-moodle.com