While it is technically possible to accomplish that with uTest now, uTest really wasn't designed to do that... So implementing that at this time, would be rather involved, but in case you want to try it, here is how I would recommended doing it.
STEP 1: Give all of your test's HTML pages predictable names. That is, names that can be determined later based on a question number. For example:
test1.html would have questions 1 - 10
test2.html would have questions 11 - 20
test3.html would have questions 21 - 30
So again, while this is technically possible... as you can see, it would take quite a development effort so it may not be worth it at this time. We'll see about what we can do to help simply that in a future release.