My understanding about the project:
1. The user launches the app. There are questions where user answers one question and moves to next question. After answering all the questions the app send the results to either a database using web service or as you suggest.
My queries:
1. Do we have to store the questions provided or do we have to fetch it using web service.
2. Will the answers have images as choices to select.
My suggestions:
1. Do you want to integrate iAd into the app.
2. Do you want to integrate Facebook for advertisement purpose.
Please read the private message board for my iOS application development experience and some notes.