No one wants to have it, but if one got it, he does not want to lose it. What is It?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What is the word or phrase?

Take one out and scratch my head, I am now black but once was red. What am I?

What is common among 11, 69, and 88?

What is the longest word in the dictionary?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?