Why Aeroplane windows are round?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What has one eye, but can’t see?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

Can you write down eight eights so that they add up to one thousand?

What has to be broken before you can use it?

Look at the picture and find out which square is not linked with any of the other squares.

What is the end of everything?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?