What word begins and ends with an E, but has only one letter?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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?

I am white when I am dirty, and black when I am clean. What am I?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

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