Aptitude Test : 30 Minutes
Technical : 30 Minutes
Details of types of questions asked in each of the sections:
The Aptitude test had two sections of quantitative and programming skills in C and C++. The quantitative aptitude was like any other test with typical problems.
The programming part had questions from C and C++.All were multiple-choice questions.They asked for outputs of the codes given,pointing out errors etc. All in all not so tough.

Name of the Topic / Task : Technology a bane or boon
Time Given : 30 Minutes

I was asked about my summer project and if I had done any project based on programming languages like c,c++ etc.I was asked a puzzle.Then they asked about various aspects of OOPS like virtual functions,difference with structured languages,polymorphism etc.Web based programming of client-server was asked.Finally I was asked a few basic questions on networking on OSI layers.

I was asked about my technical interview and also "tell me something about yourself?".My expectations from unisys was also asked.He asked the course in my B.Tech curriculum in which I was weak.I was also asked about my training and my opinion on the PPT.
Thats all I guess.

If you are good with C and C++, it will be enough to clear the aptitude.Almost everybody were selected in the group discussion.
Be cool and don't panic.
Best of luck!!!!!