2018 WAEC ( physics practical question /answers No:3 ) is out

QUESTION  1A   CLICK HERE  TO VIEW

(3a)

TABULATES/N:1,2,3,4,5d(cm):25.00,35.00,50.00,65.00,80.00I(A):0.80,0.75,0.65,0.60I^-1(A^-1):1.2500,1.3333,1.4286,1.5385,1.6667
(3aviii)Slope =
(3aix)-I ensure tight connections-I avoided zero error of the ammeter
(3bii)-Length of the wire-temperature-cross sectional area-Nature of the material