What goes through cities and fields, but never moves?

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

What's the only room from which no one can enter or leave

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

Which number should replace the question mark?

If 21x = 79x, what is the value of x?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?