Which alphabet is a part of our body?

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

What has one eye, but can’t see?

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?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

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

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?