What is resistance?

What is the resistance of an intrinsic semiconductor at 0K?

There is a current of 1.0A in the circuit shown below. What is the resistance of P?

Five 3Omega resistances are arranged in a polygen (5 sides). What is the resistance between any two corners ?

If resistance of a wire is r ohms and wire is streched to double its length, then what is its resistance ?

The following graph shows current versus voltage values of some unknown conductor. What is the resistance of this conductor?

The sequence of bands marked on a carbon resistor is in the order brown, brown, green. What is the resistance value?