Previously the question types that Quiz uses did not have any sort of namespace. So, the modules are named:
truefalse
multichoice
long_answer
short_answer
scale
matching
We've been coasting on good luck that no other assessment modules on Drupal.org contain a module called "truefalse", so to make things better for the community in the future these modules have to be renamed.
Any dependencies on these modules will no longer be satisfied as they will be renamed to:
quiz_truefalse
quiz_multichoice
quiz_long_answer
quiz_short_answer
quiz_scale
quiz_matching
Any Views, queries, theming, dependencies that require these modules will break. When these "new" modules are enabled they will automatically take ownership of the previous data tables that were fortunately already namespaced.
If you have not modified or built upon Quiz 4.x or 5.x, this change request does not affect you.