what does the below rebus means?

Imagine you are in a room with no windows or doors. How will you get out?

81 x 9 = 801. What must you do to make the this equation true?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

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

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

John is the son of Jacob.
So,
Jacob is the_____of John's father?