What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

I shave every day, but my beard stays the same. What am I?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

Give it food and it will live; give it water and it will die.

I make two people out of one. What am I?

John was piloting a plane behind a car but was never able to overtake it. Why?

Which Travels Faster? Solve below famous picture riddle: