Dear Madhu
Are you a student or a staff? The topic you choose depends upon the theme of the conference. Usually, the conference organisers will have mentioned it in their oublicity material. When and where will the conference be? You choose a topic from the given theme that you feel passionate about, as if you do not then your performance will be substandard.
I have given presentations at PESIT in the past.
Have a nice day.
Simhan