Can you convert the number zero(0) into a positive number using just one mathematical operator ?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

I can write cow in 13 letters.

Can You?

I am quite hot but become too cold if you remove the first two letters. What am I?

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

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

How many triangles can you count in the figure given?

What has no start, end, or centre?

Can you identify the famous TV character from the rebus below?