Identify the hidden meaning behind this picture?

What goes up but never comes down?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

What is the fastest way to double your money?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What is so fragile that saying its name breaks it?