If they're testing for it, yes. Nicotine is a perfectly legal substance (for anyone over 18), though, so it seems unlikely that anyone would bother.
(I'm assuming that by "dipping" you mean chewing tobacco; if you meant something else, then the method you use to get it into your body isn't really important as far as testing is concerned. All that matters is what the drug is.)
Pretty much anything can be detected in a drug test.
no
Yes, but it requires a specific test in order to be detected.
a urinalysis does not test for drugs it only tests for urinary tract infections
urine test
Yes.
Depends on the drug and the type of test.
It cannot be detected in any drug screening. :) There is no test that can detect it.
nope
Yes
Not in my experiences ;)
Yes.