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WAEC 2019 Physics Practical Answer – May/June Expo

WAEC 2019 Physics Practical Answer – May/June Expo

By May 1, 2019 WAEC 0 Comments
West African Examination Council Runz for 2019 Physics Practical Expo Answer

 WAEC Nov/Dec 2019 Physics Practical Expo Answer

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(1aviii) 
In a tabular form 
Under y(cm)
20.0, 30.0, 40.0, 50.0, 60.0
Under t(s)
36.61, 33.66, 31.32, 28.62, 25.93
Under T = t/20(s)
1.8305, 1.6830, 1.5660, 1.4310, 1.2965
Under T²(s²)
3.3507, 2.8325, 2.4524, 2.0478, 1.6809
(1ax) 
Slope s = ΔT²/Δy
S = 4 – 2.5/0 – 39
S = 1.5/-39
S = -0.0385
Intercept, C = 4.0
(1axi) 
SR = c
R = c/s = 4/-0.0385 = -103.9
(1axii) 
(i) I ensured that the retort stand was well clamped. 
(ii) I avoided error due to parallax when reading the metre rule.
(1bi)
Draw the diagram 
(α) K.E is maximum
(β) acceleration is maximum 
(1bii) 
Period, T = 2π√m/k
Given : weight, W = 120N
Mass = w/g = 120/10 = 12
T = 45
π = 3.142
4 = 2(3.142)√12/k
0.6365 = √12/k
Square both sides 
0.405 = 12
K = 12/0.405 = 29.6
========================
2a) ix) 
The minimum value of Z = Z0 = 60 and the corresponding distance Xo =30
2a x) 
W = 1/2 (60/4 + 30/2 ) 
= 1/2 (15+15)
=15cm
xi) – I ensured that the lens has placed firmly on the lens holder
– I ensured that the object and the images distances were measured from optical centre of the lens
2bi) DIAGRAM
2bii)- Human eye has a convex lens with same function as the camera
– the interior of the eye is covered with black pigment called the choroid
==================
(3ai) 
E.m.f, E = 3.00v
(3avii)
In a tabular form 
Under R(ohms)
2.0, 5.0, 10.0, 12.0, 15.0, 20.0
Under V(v)
0.86, 0.62, 0.43, 0.38, 0.32, 0.25
Under V-¹(v-¹)
1.1628, 1.6129, 2.3256, 2.6316, 3.1250, 4.0000
(3aix) 
Slope s = ΔR/Δv-¹
=17.5 – 4.25/3.5 – 1.5
=13.25/2
=6.625
Intercept, C = -5.75
(3ax) 
S = Roα
6.625 = 0.85(α)
α = 6.625/0.85 = 7.79
C = -(Ro + β)
= -5.75 = -(0.85 + β)
β = 5.75 – 0.85
β = 4.9
(3axi) 
(i) I ensured tight connections. 
(ii) I avoided error due to parallax when reading the voltmeter. 
(3bi)
Vab = 12 – 8 = 4v
Rab = 4×5/4+5 = 20/9ohms
Iab = Vab/Rab = 4/20/9 = 4 ×9/20 = 9/5
=1.8A
Power = I²ab Rab
=1.8² * 20/9
= 7.2watts
(3bii)
Current in line = power/voltage = 3600/240
=15A
Circuit breaker remain closed because current in line is less than 20A

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