I have been with my boyfriend for a year and his baby momma wants to meet me and ask me queastions. I am OK with that I just don't know what I should ask her or if I should even ask her anything.

You should only do this if your boyfriend agrees with it too.
You don't have to ask anything. She is the one interviewing you, to see if you will be a threat to the child's support and time spent with their child. If you want to start by reassuring her that you won't stand in the way of his very important fatherhood, do so. She may be happy just hearing that, and you can even get along.

I see no purpose in this, and see that this will most likely just go down hill. I agree you do not need to ask her anything,

I am thinking- how civil! Too many times we hear about the horrible stresses that happen between ex spouses, when one or the other has a new relationship. Especially when there are children involved.

I'll give his ex the benefit of the doubt here, and to be honest with you, I would hope that, for the sake of the child, both women would meet to alleviate any fears or misconceptions about the other. This act alone, could make this much easier in the long run for all of you, but particularly the child.

Go with the flow as far as the meeting goes, but, I would make sure that your boyfriend is present.

Try not to assume the worst, or think you have to meet with her approval. If all goes well, this may very well set the stage for an amicable relationship for a long time to come.