Unclear. If nothing else, the Gods of Destruction are, though.
SSG doesn't. Although, assuming Beerus's lies about his power level in that arc were consistent, then it would in the ballpark of ten times stronger than "you slapped my bulma!" Vegeta. At least in the anime.
All we know about SSB is that it's less than ten times stronger than SSG, per the manga's Goku vs Hit fight.
Not exactly, it just includes its own heaven and hell.