The matter gets crushed as tiny as it can get.
They get destroyed. Their matter becomes part of the black hole.
When you are sucked into a black hole you'll get destroyed. The matter of your body will remain in the black hole.
Objects which approach a black hole will get sucked into it.
You can't see the black hole but you can see its inflence on its environment. (You can see matter that is sucked into the black hole)
In that case, it will stay there.
It is sucked into the black hole to a point that is infinitely small.
Just the same as if normal matter falls in. The matter or antimatter will stay there, increasing the mass of the black hole (and making it more "hungry", i.e., making its gravity stronger).
Green.
You are. Though that will not matter because you will be crushed and killed
Its called a Super Black-hole and scientists believe it is what holds all galaxies together.
That's not exactly what happens. What really happens is that they just absorb each other and become a bigger black hole.
Your life will be over in an instant