List bullets are appropriate. It is acceptable to remove the colon (:) and use the question mark at the end, or leave the colon and not use the question mark. If using the question mark, it acceptable to list the items themselves as sub-bullets. A question mark at the end of the list is inappropriate in this case.

The case where it is appropriate is when you create a list something like this:

When using flour, would you use:

(bullet) Bread,
(bullet) Cake, or
bullet) Cookies?