What is the longest word in the dictionary?

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?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

How many triangles are there on the puzzle below?

Can you count the number of quadrilaterals in the picture below?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

A girl rode into a tourist spot out of the city on Thursday. She loved the place and decided to stay for a few days. She stayed for four days and then she left for back home on Thursday.

How can this be possible?