Are the questions all multiple choice? And are there multiple multiples or sequential questions?

All of the questions on the AANP and ANCC exams for FNP and AGNP candidates are multiple choice. There are no True/False or fill-in-the-blank questions. The ANCC exams for FNP and AGNP candidates sometimes contain alternate question types. See the APEA blog for a post that contains information about test differences. The post is titled "Which certification exam should I take?"