What's the only room from which no one can enter or leave

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Find the value of "?" in the ball picture Riddle below:

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?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

There is a place where if I stand up straight, I will still be considered sideways.

What word is pronounced the same if you take away four of its five letters?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?