 During the main events of the Brain Bus searches, known as "Pre-Test" events, attendees are given a 10-question version of the qualifying test; the number of attendees at this event may not exceed 1,000.Attendees who pass the test are invited back to attempt the full 50-question qualifier the next day.People who have passed the 50-question test move on to a final interview, during which show producers determine whether the contestant is someone by whom the TV audiences would be impressed.