If you say my name, I will no longer exist. What am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If eleven plus two equals one, what does nine plus five equal?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What number do you get when you multiply all of the numbers on a telephone's number pad?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?