Survey (Cross) Mobile Development

Hello :)

for my exam I'm doing a survey about (cross) mobile development.

If you're familiar with developing native mobile apps I would really appreciate if you could help me by answering these three questions:

https://docs.google.com/forms/d/1OjiLU3rH8Mt9umzrMbDH7QrWDN0exJTDpY_Jy_g_-B8/viewform

If you're familiar with cross plattform tools (jQueryMobile, SenchaTouch, Titanium Mobile, PhoneGap or Xamarin) I would really appreciate if you could help me by answering these questions too:

https://docs.google.com/forms/d/1-7g73imPL8aWq7YZEreOYnA0Bm7e8UTMOzZTm73ynDM/viewform

Thanks a lot!