What does this rebus puzzle means ?

Look at the picture and find out which square is not linked with any of the other squares.

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Count the number of triangles in the below picture?

What does this simple rebus mean?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?