What breaks yet never falls, and what falls yet never breaks?

Keyboard words are not in alphabetical order, Why?

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?

Take away the whole and some still remain. What is it?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Move four matchsticks to the below square to form three squares?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Which number should replace the question mark?