For example: This page:
http://it.toolbox.com/wiki/index.php/Interview_Questions_with_Answers_for_Oracle,_DBA,_and_developer_candidates
Please focus on:
-- How to install and set up Oracle;
-- How to monitor and support;
-- Backup and recover;
-- Performance tuning;
-- User and Application Support;
-- Some foundamental questions like:
When a check point will happen?
What is the good and bad thing is I have a machione with unlimited memory, so I can put all my database data into memry?
These are the questions I usually ask....
Wish you good luck!