By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

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?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Why is a river so rich ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.