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2018/2019 WAEC GCE RUNZ PHYSICS PRACTICAL QUESTION & ANS – NOV/DEC EXPO
Waec gce 2018 PHYSICS PRACTICAL Expo/Chokes/dubs/Runs,waec gce 2018 PHYSICS PRACTICAL, waec gce 2018 PHYSICS PRACTICAL questions and answers – nov/dec expo,PHYSICS PRACTICAL waec gce 2nd series expo/runs
Exam date : Wednesday, 5th September 2018
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PHYSICS PRACTICAL ANSWERS FROM EXAMHOT.COM
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PHYSICS PRACTICAL:
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(2a)
Tabulate
S/n | Ag/cm | 8C1/cm | tiata | U= Bc/Ac | cost Rita |
Under S/n: 1, 2, 3, 4, 5
Under Ag/cm: 7.10, 7.90, 8.10, 8.70, 9.35
Under 8C1/cm: 2.10, 3.60, 4.25, 5.30, 6.40
Under tita: 70, 46, 35, 25, 19
Under U = Bc/Ac: 0.29, 0.45, 0.52, 0.60, 0.65
Under cos tita: 0.34, 0.69, 0.80, 0.90, 0.94
(2av)
(I) I would avoid error due to parallax
(II) I would ensure right Postion of the ruler while taking the reading
(bii)
H2 = 2cm, Do = 6cm
H2 = 6cm
H2 = 4.1cm
M = Hi/Ho = 4.1/2
= 2.05
M = Di/Do = 2.05 = Di/6
Di = 6 x 2.05 = 12.16
= 12.3cm
(2bii)
Principal axis is an imaginary line passing through the center of the lens in which the principal force of the lens passes through.
(2bii)
H2 = 2cm, Do = 6cm
H2 = 6cm
H2 = 4.1cm
M = Hi/Ho = 4.1/2
= 2.05
M = Di/Do = 2.05 = Di/6
Di = 6 x 2.05 = 12.16
= 12.3cm
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(3a)
R ohms
R1 = 1ohms R3 = 3ohms
R2 = 2ohms R4 = 4ohms
R5 = 5ohms
V1 = 1.90v
V2 = 2.15v
V3 = 2.3v
V4 = 2.40v
V5 = 2.5v
In a tabular form
Under S/N
1, 2, 3, 4, 5
Under R(ohms )
1.00, 2.00, 3.00, 4.00, 5.00
Under V(v)
1.90, 2.15, 2.30, 2.40, 2.50
Under R^-1(ohms^-1)
1.000, 5.000, 0.333, 0.250, 0.200
Under V^-1(V^-1)
0.5263, 0.465, 0.4347, 0.4167, 0.400
Under R^-1/V^-1
1.900, 1.07, 0.768, 0.5999, 0.500
(3avi)
(i) Ensure tight connections.
(ii) Avoid error due to parallax when reading the voltmeter
(3b)
(i) Length of wire
(ii) Nature of wire
(3bii)
Total resistance,
R = 3 + (3×3)/(3+3)
R = 4.5 ohms
Current, I = V/R
I = 6/4.5
I = 1.33 A
(3av)
Slope = Change in R^-1/V^-1/Change in V^-1
=2.5-0.25/0.6-0.38
=2.25/0.22
= 10.23
Intercept, c = 0.33
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