Velocity factor depends to a large extent on the dielectric (insulation) used. You will have to specify the exact cable to answer this question.
:D
A UTP Ethernet cable, is I think means "unshielded twisted pair" cable and another one is called STP "shielded twisted pair" cable. The more commonly used one in the industry and by most consumers I...
Some cables have a number printed every metre to show how much cable is left on a roll or drum of cable.
see related link.