My first choice is Biomedical Engineering, but does Tech look at the second choice too?
Bump?
Okay, so their official stance is that they do not consider major when doing admissions. But it is also their official stance that they do holistic admissions as well as considering the community as a whole, which means they probably do look at your major choices. What weight they’ll give your second choice remains a mystery. Mostly what we hear is that there is a glut of people who want to major in CS, so that may be the “hardest” major to get accepted to when you consider them trying to balance the student body.
I don’t know if that helps you. 
Go for your first choice because Tech is an option only…Not a desire…Biomedical engg has good scope and value compared to tech…Hope you will go for first choice…Goodluck