What does below pictogram mean?

What can go up a chimney down, but can’t go down a chimney up?

Which is faster, Heat or Cold ? Explain.

What question can you never answer yes to?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

A woman lives in a skyscraper thirty-six floors high and is 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?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?