Charlatan, Ben is describing the MMPI (Minnesota Multiphasic Personality Inventory) and I don't think you will be taking that one because it normally takes at least an hour to complete. (Ben wasn't exagerating about 500 questions).
It's more likely that you will be taking personality type tests. Google "business personality tests" to get an idea. Here is one link:
http://jobsearch.about.com/cs/person...nalitytest.htm