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NECO 2022 PHYSICS PRACTICAL ANSWERS

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NECO 2022 PHYSICS PRACTICAL ANSWERS – ANSWERS-EXAMKING.NET
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Monday 18th July 2022
Physics (Practical)
10:00am – 12:45pm

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Physics Practical Answers
(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
(1)
Graph

(1)

(1)
Graph

(1bii)
Weight in Air = 2.9N
Weight in water= 1.3N
Relative Density= ?
Relative Density = Weight in Air/ Change in weight of water
R.D = 2.9/(2.9 – 1.3)
= 2.9/1.6 = 1.8125
Relative Density = 1.813
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(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!

(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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BONUS
(2)
L = 10.00cm

[TABULATE]

S/N: 1 || 2 || 3 || 4 || 5

β°: 70.00 || 60.00 || 50.00 || 40.00 || 50.00 || 60.00

α°: 20.00 || 30.00 || 40.00 || 50.00 || 60.00

Sinα=Q : 0.34 || 0.50 || 0.64 || 0.77 || 0.87

Z/cm: 1.70 || 2.50 || 3.20 || 3.80 || 4.30

(2xv)
GRAPH

(2xvi)
Slope (S) = ΔZ/ΔQ
S = 2.95/0.6
S = 4.92cm

(2xvii)
K = 2S
K = 2 x 4.92
K = 9.84cm

(2xviii)
(i) I ensured the pins were vertically upright
(ii) I avoided parallax error in reading the protractor

(2bi)
[TABULATE]

=PLANE SURFACE=
(i) Image distance is samw with the object distance
(ii) Magnification is always equal to one

=CURVED SURFACE=
(i) Image and object distance varies
(ii) Magnification varies

(2bii)
Number of images = (360/θ) – 1
= (360/40) – 1
= 8 images
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