#WAEC 2018 – PHYSICS PRACTICAL ANSWER

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Physics- Practical- Answers
1 )
Tabulate
s / n = 1 ,2 ,3 ,4 ,5
L ( cm)= 130 ,110 ,90,70,50
T1 ( sec )= 45. 70,42. 00,38. 00,33. 10,28. 70
T= 2 . 29,2 . 10,1 . 90,1 . 66,1 ,44
T^ 2 = 5 . 22,4 . 41,3 . 61,2 . 74,2 . 06
L = 100 ,80,60,40,20

1 )
– precautions –
Take Any Two
i ) I avoided conical oscillation
ii) I avoided drought
iii ) I avoided parallax error in taking reading from the metre rule
iv ) I avoided zero error in taking reading from the stop watch

2ai)
fo=15cm
2av)
a=60.00cm
b=20.00cm
Hence L=a/b=60.00/20.00
L=3

2avi)
TABULATE
S/N:1,2,3,4,5
b(cm):20.00,25.00,35.00,40.00
a(cm):60.00,37.50,30.00,26.25,24.00
L=a/b:3.00,1.50,1.00,0.75,0.60

2avii)
Slope=Change in L/Change in a
=(3-0.25)/(60-18.6)
=2.75/41.4
=0.006642
2aviii)
S^-1=1/S
=(1/0.0066425cm)
S=15.05
S=15cm

2aix)
PRECAUTIONS
-I ensured that all apparatus are in straight line
-I avoided error due to parallax when reading the metre rule
-I avoided zero error on the metre rule.

2bi)
u=10cm
f=15cm
Using 1/v+1/u=1/f
1/f-1/u=1/v
1/v=1/15-1/10
1/v=(2-3)/30
1/v=-1/30
v=-30cm
The characteristics of image formed are:
-It is virtual
-It is enlarged and magnified ie twice or two times as big as the object m=2

2bii)
The concave mirror mounted in its holder is moved to and fro in front of the screen until a sharp image of the cross wire of the ray box is formed on the screen adjacent of the object.The distance between the mirror and the screen was measured as 30cm since the radius of curvature r=2fo then half is distance

2bi)
he characteristics of imaged formed are :
i)It is virtual
ii) It is enlarged or magnified i.e. twice or two times bigger as the object(m=2)

(3a)
TABULATE
S/N:1,2,3,4,5
d(cm):25.00,35.00,50.00,65.00,80.00
I(A):0.80,0.75,0.65,0.60
I^-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

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