I am creating a Quiz game that can contain any kind of quiz in different categories e.g. In Sports category it can be Cricket, Football etc., In Space category it can be Universe, Planets, Space Missions etc. For all that I have created the basic architecture, but I stuck on data for showing these quizzes. Where can I get this kind of data that can be used commercially?
I suggest you take a look at the following Q&As:
However, I don't think you're going to find a data set for you to download and import into your game. One idea would be to do some NLP on open-ish sources like Wikipedia to extract facts and turn them into questions and answers.