There are certain questions you should never ask at the interview, irrespective of who you may be meeting. Don't ever ask about the salary, vacation time, pension plan, gym plan or anything remuneration related. You WILL come across as being more interested in the compensation than the company. Your talking about these issues at the interview will destroy all the other hard work you've done.
Other interview killers are:
- "What does this company do?" - This shows you haven't done your homework and haven't been listening.
- "If I get the job when can I take time off for vacation?" - It's always better to wait until you get the offer letter to mention prior commitments. Don't mention any travel plans or other time commitments at the interview.
- "Can I change my working hours if I get the job?" - If you need to figure out the logistics of getting to work, don't mention it at the interview.
- "Did I get the job?" - This will come across as a little desperate and somewhat unprofessional.
Don't be impatient because they will let you know their decision and probably sooner than what you expect.
Do not ask anything that may give the impression that you believe the job is yours. This will come across as presumptuous and you may be wrong. This will altogether create a negative impression.