What month of the year has 28 days?

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

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

How many sides does a circle have?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?