What occurs twice in a week, once in a year but never in a day?

What has a ring but no finger?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What is black when you buy it, red when you use it, and gray when you throw it away?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

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.

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

What always comes into a house through the keyhole?

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