There are groups of questions and all answers lead to a connection between the group.
Question 3 and 5 belong to one group and from of the other answers I think it may be something to do with football or rugby clubs nicknames
Question 12 belongs to another group and I think the connection may be weights and measures
Question 13 belongs to another group and I think the connection may be group names of animals.
After saying all that I could be totally up the wrong path.