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

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Can you make a six-letter word using the letters N, A and B ?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Count the number of lines in the image below ?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Can you replace the question mark with the correct number in the below table sequence?