What does the below rebus riddle means?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

A man is surviving on an island along with his friend. They have been starving for four days for food. Suddenly, they find a fisherman. The friend goes with the fisherman in order to catch the fish (if they can find any).

The fisherman returns after some time but he is alone and has some salmon that he had prepared. When asked, the fisherman tells him that his best friend fell off the boat and drowned in the water. Starving for so long, he eats the meal while crying for his friend.

After being rescued, he goes to a diner and orders salmon. When he eats his meal, he jumps and commits suicide. Why did he do it?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

There is a place where if I stand up straight, I will still be considered sideways.

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Why do you find that most of the buildings are deprived of the 13th floor?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..