What does the below image rebus riddle means ?

Count the number of balls in picture below:

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?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

I cannot talk, but I always reply when spoken to. What am I?

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