Hi Versha,
Responses to requests can take 1-2 days in these forums. Please plan accordingly and leave extra time for questions and discussions.
This particular forum is for planning display and presentation of projects once the work is done. You should post these sorts of questions in the Life Earth and Social Sciences Forum:
http://www.sciencebuddies.com/mentoring ... um.php?f=3
The project topics that you have provided are very broad, so it is difficult to suggest any particular science fair project. If you can give us a more specific topic, then the experts here can assist you with modifying and refining your project. If you are having trouble thinking of a specific topic that interests you, you will find many suggestions for science fair projects on the web and at the Science Buddies web site.
http://www.sciencebuddies.com/mentoring ... deas.shtml
Good luck. I look forward to hearing more about your interests.
Chris