What begins with T, ends with T, and has T in it?

What have one eye but still cannot see?

Which letter of the alphabet has the most water?

You can see it everyday, But cannot touch it at will. What is it?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

Prove that twice of ten is the same as twice of eleven.

81 x 9 = 801. What must you do to make the this equation true?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

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

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?