FAQ schema is such type of code and content which you place on your site and that tells to the search engines or crawler that this content is presented on your website in a format of question and answer”. When the content is correctly marked up, then it will help or eligible for rich snippets in the SERP.
Frequently Asked Questions :
No, but in SERP result shows approx. 3-4 line related content.
Yes, content quality and in-depth content can help in SERP ranking.