Different companies will ask different questions. Memorising sample questions is unlikely to help.
Advice:
Relax
Don't exaggerate your abilities.
If you don't know an answer, admit it.
You are right..but there might be some common basic questions...Recently one person asked me below 2 questions.
How can I verify that backups are occurring on a daily basis?
How do you know if your database backups are restorable?
I do backup restore 10 times a day...still I was not able to answer such questions...
Thanks.