No, they are gone from the iPad.
If you've synced or transferred purchases from the iPad to iTunes, they will be in iTunes and you'd also have to manually delete them from there too (if you really don't want them anywhere in your possession.
However, the App Store will always show them as being purchased. I believe there is a way to "hide" that information, but I don't remember how at the moment.
Hope this helps.
Marilyn