When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What goes through cities and fields, but never moves?

If eleven plus two equals one, what does nine plus five equal?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

What does it mean?

What is at the end of a rainbow?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?