The purpose of closing calipers before using them is to

a. check the zero setting of the caliper.
b. check for wear on the caliper.
c. test the accuracy of the caliper.
d. ensure the mechanism isn't jammed.

Your not allowed to ask their age, only if they're above 18, you cannot ask if they have ever been arrested, convicted, or spent time in jail prior to employment (you can however ask a question like "perhaps this job required security clearance, would you be able to attain it? "). you also cannot ask the severity or nature of any disabilities they have but similar to criminal record can ask if they are able to preform the job safely. in addition to this, you can ask *after* an interview if they're married for insurance reasons. so it appears to be c and d, but if you can only chose one it would probably be b.

Iwould want a good job, home, and city/state. the reason being is i want to have a nice life and stay healthy. i want to get a good salary!