All the supported learning management systems allow questions to be randomly selected or delivered during an exam. Different learning management systems will have different names for the random selection feature. Blackboard Learn uses the term "Random Block" and "Question Sets," and Canvas, a "Question Group".
To create a random grouping of questions in Respondus 4, go to the Settings menu and select the tab labelled "Random Block", "Question Group" or similar random question reference. The user guide or online help will further explain how to use this feature for the supported learning management system.