No one wants to have it, but if one got it, he does not want to lose it. What is It?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Which alphabet letter is a question?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?