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WAEC GCE Physics Alternative To Practical Specimen 2017/2018 | Physics Specimen Expo/Runz
*PHYSICS PRACTICAL ANSWERS*
(1ai)
Real values of masses(msi)g
msi=50.0
ms2=52.5
ms3=54.5
ms4=58.0
ms5=60.0
Real values of di(cm)
d1=5.50
d2=5.80
d3=6.00
d4=6.30
d5=6.60
(1aii)
Real values of ti(secs)
t1=6.45
t2=6.80
t3=6.85
t4=7.40
t5=7.45
(1aiii)
Real values of mli(g)
ml1=>msi-mso=50-20=30
ml2=>ms2-mso=52.5-20=32.5
ml3=>ms3-mso=54.5-20=34.5
ml4=>ms4-mso=58.0-20=38.0
ml5=>ms5-mso=60.0-20=40.0
(1aiv)
TABULATE
i:1,2,3,4,5
msi(g):50.0,52.5,54.5,58.0,60.0
di(cm):5.50,5.80,6.00,6.30,6.60
ti(s):6.45,6.80,6.85,7.40,7.45
mli(g):30.0,32.5,34.5,38.0,40.0
(1aix)
(i) I avoided parallax error in reading clock/weight balance
(ii) I ensue repeated readings are taken to avoid random error
(1bi)
(i) weight
(ii) upthrust
(iii) viscous force/drag or liquid friction
(1bii)
The amplitude of oscillation of the loaded test tube decreases with time because of the viscous drag(force) which opposes the motion.
=========================
ANSWER NO2
b(ii) given : f = 10cm
u = 20cm
v = ?
Using:
1/f = 1/u + 1/v
1/10 = 1/20 + 1/v
Multiplying through with 20v, we have:
2v = v + 20
2v - v = 20
v = 20cm
Magnification, m = v/u
m = 20/20
m = 1
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