Principle interview questions

I got call from HR and the interview process is Online MCQ test and followed by two technical interviews and this was a one week process. MCQ test consist of core java programs and you have to put answer for them.

There were 3 rounds 2 technical + 1 hr. I have successfully completed 1st round, but 2nd technical round was little bit tough for me.I was out from 2nd technical round because of I'm fumle to answer that questions.They want technical support person and they rejected me as my communication skill was not good at that time, but I'm technically powerful.