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

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

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Which digit occurred maximum times between the number 1 and 1000?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Using eight eights and addition only, can you make 1000?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

In which direction should the missing arrow point?

I am white when I am dirty, and black when I am clean. What am I?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.