I have an eye but still cannot see.

Who am I?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

The more of this there is, the less you see. What is it?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?