From the 2N7002's data sheet, it can be shown than there is a minimum voltage threshold and maximum threshold and also a typical voltage threshold.
Case 1: When the MOSFET gate gets 1V, the MOSFET begins to turn ON(> 0%). When the MOSFET gets 2.5V, it's 100% turn ON?
Case 2: When MOSFET get gets 1V, the MOSFET turns on to 100%. When the MOSFET crosses 2.5V, then the MOSFET remains 100% open until Gate is conntected to ground GND.
Case 3: Between 1V and 2.5V on the gate, then MOSFET is 100% open. Above that, or under, the MOSFET is closed
Case 4: When gate gets 1V, the MOSFET turns on. But above 2.5V, the MOSFET can be harmed and breaks.
Please, keep it simple and very clear. I have read lots of post about the threshold and every body talking about theory. I just want a clear answer what