Honestly, at that level you won't be driving your own research. You will be under the supervision of someone who is driving their own research program.
Your process when applying to do graduate research will be shop around for academics and research groups who are working on things that look interesting to you. You'll send them an email and ask them if they are taking new research students right now (usually the answer would be yes, especially if you have good grades) and what sorts of problems would they give to a new student.
If the initial email looks positive, the next step will be meet them for lunch or a coffee. It won't be called an interview, but that's basically what it will be.
You'll be able to make suggestions and give a general hint of what you'd be most interested in, but at the end of the day it will be up to your research supervisor to both suggest topics for you to research and/or to give feedback on any preferences or interests you have.
Honestly, at that level you won't be driving your own research. You will be under the supervision of someone who is driving their own research program.
Your process when applying to do graduate research will be shop around for academics and research groups who are working on things that look interesting to you. You'll send them an email and ask them if they are taking new research students right now (usually the answer would be yes, especially if you have good grades) and what sorts of problems would they give to a new student.
If the initial email looks positive, the next step will be meet them for lunch or a coffee. It won't be called an interview, but that's basically what it will be.
You'll be able to make suggestions and give a general hint of what you'd be most interested in, but at the end of the day it will be up to your research supervisor to both suggest topics for you to research and/or to give feedback on any preferences or interests you have.