What does this simple rebus mean?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What 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.

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Count the number of lines in the image below ?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What is the longest word in the dictionary?

What has a ring but no finger?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?