I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What breaks yet never falls, and what falls yet never breaks?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

What is red and smells like blue paint?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?