I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

When does a USA Potato change its nationality?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Can you solve the rebus below?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?