
First, I wouldn't be worried about asking questions that are too specific or asking too many of them.
As an example of why specific questions are important, when I was
interviewing for my current position the bulk of the interview (at least
an hour) was spent going over various programming questions.
I was asked to write the following code examples on a white board for scrutiny or answer these questions:
What is POST, GET, SESSION and how do they differ
Simple Select Statement
Select Statement with Joins and a Where Clause
Example of recursion (specifically removing slashes from $_POST)
Example of connecting the database, executing...