the ones I use for weakness, that are true are:
Miss/work into lunch
Do not leave right at closing time.
Questions to ask them can be more about the role you are applying for. What are the hours, what do you expect, what other duties are included that was not listed in the ad. Who to respond to.
You can also ask about the company. How long have they been around or how long has the people interviewing you been around. What is the cliental/how many clients. How many people work for the company.