1) Volga River
2) Ob River
3) The deepest lake
4) Elbrus
5) Novosibirsk
6) Federal subject (a federal city)
7) No, the largest city is Istanbul, Turkey
8) It's located in the southwestern part of Siberia on the banks of the Ob River.
9) In January 10, 1904.
10) It's location.
(Не гарантирую что правильно)