There were 3 rounds.
Day 1: There was online test comprising of questions from aptitude-quant,verbal and nonverbal reasoning, data structures, networking, C, C++, complexity.
Day 2: My technical interview lasted around an hour or more. The questions were asked from C, C++, Java, Programming, Data Structures, Networking, Algorithms, Software Testing. Infact Aricent is one company in whose interview all subjects are asked so you need to be well prepared about basics of all subjects. Even they asked me a little about compiler. I described them about my projects in well details. The interviewer was a calm person and very friendly towards his interviewees. After I cleared this round I had an HR round. The HR round consisted of 1 HR taking interview of 3 people together. My family background and hobbies were asked. Main strength was on my strengths and weaknesses. I had singing as one of my hobby so she asked me to sing and I sang a romantic bollywood song. I think she liked my singing as I got through it. :D