How many triangles are there on the puzzle below?

Can you name some countries which do not have the alphabet 'A' in them?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

What can you catch but never throw?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

What demands an answer, but asks no questions

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.

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?