It is not pre-decided in the syllabus. You have to be sharp for this topic. They can give you any topic. It can be related to politics, social awareness, IT, sports, Inventions etc. It can be
· importance of social media
· present political scenario
· water crisis: how to save water
· importance of elementary education
These are only few topics. Sky is the limit for this. To get prepared for this round, you should read newspaper daily. It will help you to solve the problem related to GD topics.