UBS Mainframe Developer interview questions

First round was online Hackerearth with MCQs on Cobol, JCL, Sort, DB2, SQL with Webcam on. :-) Then I was called for F2F Technical interview. Interview was overall good, but I felt that for some questions(2 in specific) even though I gave correct answer, interviewer was not satisfied. I couldn't figure out(till now) if it was genuine confidence checking or just interviewer own misunderstanding. Thought of writing to them, as a one question can also change a lot.. anyway overall they were positive, so refrained from writing. Thinking may be just my bad luck. Some questions were scenarios based. Overall it was good experience, with some of my own bad luck. Not wise to add exact Questions, as it would be unfair with hardworking individual who don't get to see them. Bt will add topics. **One thing that I learned, you have to be prepared all the times, you never know when the door open and you are asked to go thru test. All the best to others reading my post.