Yes, questions associated to any document in the customization of ADA can be deleted.
Please, remember that all documents must have at least one question associated to them. To do so, follow these steps:
1. Click on the grey left-side menu "ADA Customizations"
2. Search for the document (should you have more than one customization, you can also search for the version which needs editing in the tab "ADA customizations".)
3. Once you have found the document containing the question you want to delete, click on the arrow to edit it.
4. Delete the above mentioned question by clicking on the trashcan icon.