If you want certain questions to appear together, even when an assessment is set up to randomize questions, you can assign them to a group. For example, let's say that you have three closely related questions about the European Union. You could put them into a group called EU. The randomizer will treat those questions as a group. In one exam, they might appear as question #1, 2, and 3, while in another exam they appear as question #5, 6, and 7; however, they will always appear together.
For more information about how to Create a Group of Questions