What does this simple rebus mean?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

How many times do a clock's hands overlap in a day ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I have branches, but no fruit, trunk or leaves. What am I?

Identify the 10 differences between the two given pictures.