What country can make you shiver?

No matter how little or how much you use me, you change me every month. What am I?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

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

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What does below pictogram mean?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?