Waiting list to questions on registration page
It is not possible to link the waiting list function to question on the registration page, since the waiting list works with the event's maximum capacity, defined on the Settings page and/or Waiting list settings.
Waiting list to participant types
You can use the waiting list if you have participant types in the event and use them to manage your multiple choice questions.
Let's take an example:
You have an event that lasts several days and registrants may choose one of them. They also need to answer questions that concern all registrants regardless of the day they wish to attend, and these questions may have capacities in common.
To do this, create participant types for each event date. The registrant selects which day (participant type) they'll attend and after that they'll fill in their information (name, e-mail etc.). If one of the days fills up, the registrant can still select another day or sign up for the waiting list. Read more about activating the waiting list and how to keep track of participants on the waiting list.