No, a black hole definitely does not have infinite mass. In some mathematical models, there is an object called a singularity, inside a black hole, which has infinite density. That is not the same as infinite mass. If a finite mass is contained in zero volume, then the density becomes infinite. We do not have any real confirmation that such a thing as a singularity or an infinite density actually exist, but they may.
The object swallowed by the black hole is destroyed; its mass is added to the mass of the black hole.
The mass of a black hole can be measure by the effects of its gravity on surrounding objects.
They are called Black Holes or singularities.
Assuming you mean the event horizon of a black hole (there are other types as well), the diameter of a black hole as measured by its event horizon is directly proportional to its mass. The larger the mass, the larger the diameter. Thus, as a black hole's mass increases, it will get bigger. The only limitation is how much mass a black hole is able to incorporate from its surroundings.
That's basically the description of a black hole.
A black hole has infinite density.
No, a black hole definitely does not have infinite mass. In some mathematical models, there is an object called a singularity, inside a black hole, which has infinite density. That is not the same as infinite mass. If a finite mass is contained in zero volume, then the density becomes infinite. We do not have any real confirmation that such a thing as a singularity or an infinite density actually exist, but they may.
I has infinite mass but zero volume.
The classical idea about black holes is that in a black hole, mass is concentrated to an infinitely small size, so it has an infinite density. That would cause an infinite gravitational field. However, this infinite density, etc. seems doubtful in view of quantum physics - but what exactly happens near the center of a black hole has not been completely clarified yet.
It is infinite
It's only infinite around the event horizon.
The object swallowed by the black hole is destroyed; its mass is added to the mass of the black hole.
There is no way to escape from a black hole because it's gravity is infinite.
If an object had infinite length, it would also have infinite mass, so everything in the universe would be attracted to it, turning the entire universe into a super giant black hole. In other words, no.
Yes, black holes have few properties - among them mass, spin, and charge. Black hole theory indicates that at the center of a non-spinning black hole is the singularity where the mass is concentrated, a point of infinite density and zero volume, considered to be point shaped. For a spinning black hole, the singularity is calculated to be ring-shaped. Not only does the black hole spin, but general relativity predicts that space itself will spin outside the black hole, a phenomenon referred to as frame dragging.
Yes. Intermediate-mass blackhole is a medium size black hole. Scientists have found stellar black holes and supermassive black holes but there is no prove that Intermediate-mass black type of black holes exist. My opinion is that they do exist because when a black hole is becoming a black hole supermassiveblack hole it will need to go though this stage of intermediate-mass black hole.
Its density becomes infinite. Except that what you have described is a black hole and the ordinary laws of physics and maths do not apply in or within the event horizon of a black hole.