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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I don't get anymore wetter, no matter how much rain falls on me.

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

How many Watermelons are there in the below picture?

Guess the hidden movie name?