What goes up but never comes down?

Which alphabet letter is a question?

What kind of band never plays music?

Complete the table series riddle by finding the number that can replace "??".

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

What is both possible and impossible at the same time?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

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 was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?