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

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

Can you identify if it's a murder or a suicide ?

How many words can a pen with half refill write?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Bay of Bengal is in which state?

Can you write down eight eights so that they add up to one thousand?

How can you take 2 from 5 and leave 4?