Question

Name the different methods of finding unknown resistance

Answer 1

by using wheits stone bridge

Answer 2

Well, there are many method in order to find the unknown resistance .Each method is unique in it's own way but are used for resistance in different range .
In order to findout the very low resistance( less than 1 ohm)  the methods like  Kelvin double bridge method as well as the  Potentiometer methods are effective. 

For medium range resistance:
1) substitution method (2) using Ohmmeter (3) Carey- Foster bridge method are used along with other methods

If you want to measure the high resistance  1) Megger method (2) Loss of charge method (3)  Meghom bridge method are the famous methods to measure it.