I was surprised to find that, although I have little or no bias for skin tone, race, or Native Americans, I did have a bias of Asians as foreigners. I was surprised because I have more Asian friends than black or Native American friends, so I just expected to have less bias toward Asians. Then I realized that almost all Asians I know speak with an accent. Maybe that's where my bias comes from.
I do question the accuracy of using a 10 minute online test to delve into someone's psyche, however.