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

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

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

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you find the dog hidden in a group of pandas?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

The answer I give is yes, but what I mean is no. What was the question?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

What English word has three consecutive double letters?