They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What is the largest number you can write with just 3 digits?

Can it be possible to build a house that has all its four walls facing towards the South?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?