2017/2018 WAEC GCE EXPO: PHYSICS PRACTICAL QUESTIONS AND ANSWERS NOW AVAILABLE HERE

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PHYSICS PRACTICAL THEORY:
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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.
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(2bii)

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
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3bi)
The resistance of a metallic conductor increases
with increase in temperature of metallic
conductor increases the velocity of free
electrons increases which cause resistance in
the path of free electrons
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3a)
W1
s/n-1,2,3,4,5,6
xn(cm)/d1=0.009m-
3.06,3.50,3.70,4.30,4.50,4.80
xm(cm)converted/-
15.30,16.50,18.50,21.50,22.50,24.40 xm(cm)converted d2=0.005m-
84.70,83.50,81.50,78.50,77.50,75.60
Ri(n)- 11.07,10.12,8.81,7.30,6.89,620
Tabulate W2
s/n-1,2,3,4,5,6
xmi(cm)- 1.40,1.65,1.80,2.20,2.55,2.94
converted/xmi
(cm)7.00,8.25,9.00,11.00,12.75,14.70
xni(cm)- 93.00,91.75,91.00,89.00,87.25,85.3 R2i(n)- 26.57,22.24,20.22,16.18,13.69,11.61
slope dy/dx=26.57-13.69/11.07-6.89
=12.88/4.18
=3.08 3ix)
k=d2/d1*squareroot5
=0.005/0.009*squareroot13.08
=0.56*1.75
=0.98 3x)
i)i would ensure that the terminal are well
tightened to avoid partial contact
ii)i would obey the conect connection of
positive to positive to negetive to negetive
when connecting to circuit
(3bi)
The resistance of a metallic conductor increases
with increase in temperature of metallic
conductor increases the velocity of free
electrons increases which cause resistance in
the path of free electrons
(3bii)
p=I^2R
P=V^2/R
P=1000W
V=200v
R=? 1000=200^2/R
R=40000/1000
R=40ohms
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