Spot what is wrong here in below Picture?

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

What does this Rebus Picture mean?

Can you count the number of squares in the figure below?

Solve the puzzle by telling what does below picture means.

What is the longest word in the dictionary?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?