Which alphabet letter is a question?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

What does below Rebus say?

XLR8

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you start the fire using two pieces of wood?

Find out the missing number in the picture attached:

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?