well there is no limit on the number of questions except the questions needs to be approved by the admin
According to rules, we can only make 10 new question per day to post on this site.
you can give unlimited answer but you will get points for 10 questions because it is the limit.
There is no any limit for asking new question on daily basis. But, there are limits for number of questions for which we can earn points (10 pts) per day. And that limit is : 10 questions per each day. It means OC gives us points for only first 10 new question on daily basis. But, it not means that we can only post 10 new question per day.