UBC interview random questions (overthinking)

Probably getting too far into overthinking, but if anyone can answer that would be great:

Are hand gestures good or bad? Are no hand gestures going to seem robotic?

Do you introduce yourself with your full name or just your first name?

If you have leftover time, do you make convo with the interviewer, or just stare off into space?

Thanks to anyone who has any insight!