Ok, I wont use Google, I wanna see how much I know!
1. Albus Percival Wulfric Brian Dumbledore(he's in my avatar picture as well).
2. He was a half Kneazle(no 100% sure on the spelling) and he was very intelligent. He could solve problems on his own.
3. Easy one, Morsmordre!
4. Well, it hides the information into another person's soul.
5. Peter Pettigrew.
6. Marvolo Gaunt's ring, Tom Riddle's diary, Salazar Slytherin's, locket, Helga Hufflepuff's cup, Rowena Ravenclaw's lost diadem, a part of Harry's soul or simply Harry Potter and Nagini.
7. Tough one one, I think it's 6-2-4-4-2, because I remember counting and the total sum of the numbers was 18, so I think I got it right.
8. Percival Dumbledore attacked 3 muggle boys and that's why he got sent to Azkaban where he eventually died.
9. Aberforth Dumbledore is the Land Lord.
10. Omg, tough one! Minerva McGonagall and the "Five unknown Animagi" were registered if my memory serves me correctly, but I think the total was 7, which means I'm missing someone.Rita Skeeter, Sirius Black, James Potter, Peter Pettigrew, Falco Aesalon were also Animagi, but I'm not sure if any of them was registered.
11. He was an Auror and later Minister for Magic.
12. He was a member of the Order of the Phoenix and was part of the Advance Guard escorting Harry from Privet Drive to 12 Grimmauld Place?
Good trivia, I enjoy answering tough questions. I think I did well and I had lots of fun trying to figure out some answers!