Previous job applications

Hi everyone. I recently got hired and need to submit form for my security clearance. Thisbmy first time ever so I have couple questions:

  1. If I put all my previous employers down honestly and I really do not have any issue. I always been ethical and there were never an issue with any of them, would the investigator check my old job applications for the jobs that I only applied and never actually got hired to?
  2. Would my current employer submit my resume with clearance check request? Or my application?