NCPL IOS Developer interview questions

We have attended three rounds of interview, one is an telephonic interview concern IT recruiter, next round of interview with technical team and final round with HR team. They interviewed me in very polite way to be success each and every step in the hiring process. Technical team asked quite good number of questions. 1. How many applications you have developed upto now and is those are live? 2. Can you explain me about your project briefly? 3. What are bundle identifiers and whats there purpose and how they are helpful in applications? 4. What are the tableview delegate methods, mapview delegate methods and protocols.