Sperm can live outside of the body for just a short amount of time. By the time it has dried it will have already died. In my opinion if you do not understand how the reproductive organs operate/work then you should not be engaging in sexual acts. PLEASE research how pregnancy really happens - the technical aspects, not just the "fun" part. By educating yourself you will know how to be able to prevent pregancy and avoid an STD as well!! My advice is that you take birth control pills if you are female, use a condom (male or female) and use a spermicide as well!
Yup. Deader than a doornail.
by the time it's dry it's dead.. It's still considered a biohazard, and can blow away under the right conditions.
Dried semen containing sperm becomes essentially dried protein, and can be crushed and aerosolized, to some extent (theoretically). The dissicated sperm, however, are dead and incapable of causing pregnancy.
I have no idea why you need to know this, but as for your question. No