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

You can see it everyday, But cannot touch it at will. What is it?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What has many keys but can’t open a single lock?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

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

In which direction should the missing arrow point?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?