Placement Papers - CTS

I attended the placement drive at my college. It was the placement drive for cognizant. The aptitude paper was easy. I easily cleared it. Next round was interview.
I got a technical interview(some lucky guys got an HR interview). The technical interview was so tough for me. I didn\'t cleared it. I will give the details of my interview

Me: Good afternoon sir
Tech: Good afternoon, please be seated
Me: Thanks
Tech:So you are (name). Do you have any backlogs?
Me:No sir
Tech:You got a high percentage in 10th about 92%, then 79 % for Higher secondary, and 65% till now.. any reason for this??
Me: I didn\'t have a reason for that.
Tech: about mini project
Me:told
Tech:In which language you did that?
Me: PHP
TEch:What is session in PHP?
Me:told
Tech:Include?
Me:told
Tech: Do you ever user torrent?
Me: Yes
Tech: Explain about it
Me:Explained
Tech:How is the peer to peer hashing done?
Me:dont know much details
....etc.

All the best guys.!