NECO 2022 PHYSICS PRACTICAL QUESTIONS AND ANSWERS
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(1)
a₀ = 53.8cm
[TABULATE]
S/N: 1 || 2 || 3 || 4 || 5
M/g: 50.0 || 100.0 || 150.0 || 200.0 || 250.0
aᵢ/cm: 52.10 || 50.30 || 48.40 || 46.50 || 44.80
aⁱ/cm: 52.20 || 50.60 || 48.90 || 47.40 || 45.20
d=(a-a₀)/cm: -1.70 || -3.50 || -5.40 || -7.30 || -9.00
(1xiii)
Slope = (∆d/cm)/(∆d¹/cm) = -9.00 - (-1.20)/cm/-8.60 - (-0.60)/cm
= -7.8/-8.0
Slope = 0.975
(1xiv)
Precautions
(i) I ensured that I avoided error due to parallax while reading the metre rule
(ii) I ensured that the load does not oscillate before taking reading
(1bi)
The ratio of mass of paraffin to volume of water is 900g/cm³ and the ratio of density of paraffin to density of water is 0.9
(3vi)
[TABULATE]
R(Ω): 1.0 || 2.0 || 3.0 || 4.0 || 5.0
l (cm): 60.00 || 50.0 || 45.0 || 42.9 || 41.2
(100 - l)cm: 40.0 || 50.0 || 54.5 || 57.1 || 58.8
Z=(100 - l)/l : 0.6667 || 1.0000 || 1.2000 || 1.3310 || 1.4272
R-¹(Ω-¹): 1.0000 || 0.5000 || 0.3333 || 0.2500 || 0.2000
(3vi)
GRAPH
(3viii)
Slope, S = ΔZ/ΔR-¹
S = (0.84 - 1.28)/(0.6 - 0.29)
S = -0.44/0.31
S = -1.419
Intercept, c = 1.68
(3ix)
K = c-¹ = (1.68)-¹
K = 0.595
(3x)
(i) I avoided parallex error when reading the potentiometer
(ii) I ensured tight connections
(3bi)
A possible reason is wrong circuit connection
Solution: Check connections and ensure they are all tight.
(3bii)
I - Voltage
II - Current.
(3)
(3)
Graph!
[img]https://i.ibb.co/ySRNCF5/IMG-20220718-WA0107.jpg[/img
(3bi)
The positive terminal of the cells and the battery used the circuit might not be connected potentiometer wire
Correction: In such case we will ensure if all connections are tight and connecting wire are not broken
(3bii)
Parallel ---> Voltage remains the same
For series ---> Connect remains the same
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