I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Complete the table series riddle by finding the number that can replace "??".

The cream is heavier than Milk. True or False?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

What is more useful when it is broken?