[" Which of the "V-I" graph obeys "Ohm" 's "],[" law "]

Which of the following obeys Ohm.s law?

i. Water vapour, ii. Silicon, iii. Zinc, iv. Germanium. Which of the above substances obey the Ohm's law ?

Do all materials obey Ohm's law ?

Name the following Conductors which do not obey Ohm's law

For students performed experiments on series and parallel combination of two given resistors R_(1) and R_(2) which obey Ohm's law and plotted the following V-I graphs : Which of the graphs is correctly labelled in terms of 'series' and 'parallel' ?

How is V rarr I graph of material following Ohm's law.