I applied online. The process took 1 day. I interviewed at Cognizant (Pune) in Mar 2010
Interview
I had registered on CTS website, after which I received the call letter for off-campus drive from CTS. On that day, I went through Aptitude test, Technical interview and after that a HR round. Aptitude was really tough one but one who has done good preparation will clear it easily. Technical round will have questions from your education background only and HR round will be checking your communication skills only.
I applied through college or university. The process took 1 day. I interviewed at Cognizant (Chennai) in Oct 2013
Interview
received interview call through Amcat. For people who had 80% in 10, 12 and UG did not have any aptitude test. First one was a technical interview. It went for 20 mins. It was easy just the basics and the resume. Second one was a 10 min Hr discussion. Announced the results within couple of days.