Some of the very common questions asked during visa interview are:
Why do you want to study abroad?
Why have you chosen this university?
Who will fund your education?
What willl you do after completion of your studies?
How many family members do you have?
What your father does?
Do you have any other family member studying abroad?

I found similar possible questions at:
http://www.abroadeducation.com.np/visa-preparation/possible-questions-visa.html. I think this website will help you.