For deleting a survey question, we'll use the example of eliminating the name question from of the demographics page. You can follow the steps below to remove any item from your survey(s).
1) Go to Surveys
2) Click on the (survey designer) icon for the survey that you want to work on.
3) Click on the (edit page) icon for the demographics page.
4) Click the (delete item) icon for the Name question.
5) Click 'ok' when it asks if you're sure you want to delete the item.
You'll need to do this for each survey that you want to remove the question from.