CB User Validation Challenges

I'm wondering can CB be used to ask a series of validation questions (mother's maiden name, name of high school and so on) when they register on the site? Then, while they are logged in, CB presents them with a question (What's your mother's maiden name) every 30 minutes or so? If not answered correctly, they are logged off the system.

My plan here is to have Joomla+ Joomdle +Moodle work together where the users take online courses. A requirement is to have this type of challenge/validation question while they are logged into the system.

Possible, yes. Implemented, no. You'd need to develop a plugin to do the "ask every 30 minutes" part. The questions part can be just normal fields added to registration.

Thank you for the reply. Any ideas where/who I can go to get this done and an approximate costs? Thank you in advance.

You could check places like Joomlancers to hire someone. It'll likely need to be a Joomla system plugin so the check can be performed on every page load.