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NECO 2017 Physics Practical Solution Answer

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NECO - PHYSICS PRACTICAL ANSWERS

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Exam Time: Monday 5th June 2017
Practical: Physics – 10am – 12:45pm
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(2av)
TABULATE
S/N:1,2,3,4,5,6
U(cm):30.00,35.00,40.00,45.00,50.00,55.00
V(cm):25.50,24.50,23.50,22.50,21.50,20.50
M=V/U:0.850,0.700,0.588,0.500,0.430,0.373

(2avi)
Draw the graph

(2aix)
-I avoided Parallax error in reading metre rule.
-I Repeated the readings as shown on table.
-I ensured Collinear alignment of apparatus.

(2bi)
Using 1/f=1/v+1/u
1/20=1/v+1/25
1/20=(25+v)/25v
25v=20(25v+v)
25v=500+20v
5v=500
v=500/5
v=100cm
Image distance =100cm in front of the mirror

(2bii) 
Draw the diagram

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(3avii)
Vo=0.35V
TABULATE
S/N:1,2,3,4,5,6
R(ohm):6.0,5.0,4.0,3.0,2.0,1.0
V(v):2.50,2.40,2.30,2.20,2.00,1.90
P=E-V(v):0.10,0.20,0.30,0.40,0.60,0.70
I=V/R(A): 0.417,0.480,0.575,0.733,1.000,1.900


(3aiv)
DRAW THE GRAPH 

(3aix)
Slope=change in y/Change in x=(0.733-0.480)/(0.40-0.20)
=0.253/0.20
=1.265

Intercept=R=S^-1=1/1.265
=0.791

(3ax)
I=0.385
I^-1=(0.385)^-1
=2.597

(3axi)
-I ensured tight connections
-I avoided error due to parallax when reading the voltmetre
-I ensured the key is opened after each reading to prevent the cell from running down

(3bi)
Ohm's law states that the electric current passing through a metallic conductor at constant temperature is directly proportional to the potential difference apllied between its ends

(3bii)
Since I =Total emf/R+r
I=3E/R+3r






























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