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

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Replace the question mark with the correct number in below Picture:

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Spot 5 differences in two Christmas tree below:

There is something which you can be arrested for attempting but not for successfully completing.

What 5-letter word typed in all capital letters can be read the same upside down?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?