NECO 2022 Physics Practical Answer – July/Aug Expo


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*NECO PHYSICS PRACTICAL*

1a





(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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(2bi) 
{TABULATE}
[UNDER REFLECTION OF LIGHT BY PLANE SURFACE]
(i) Forms an upright image always.
(ii) Image formed when light is reflected is always the same size as object.

[UNDER REFLECTION OF LIGHT BY CURVED SURFACE]
(i) Image formed by by curved mirror can be inverted or upright image formed.
(ii) Image formed depends on where the object is placed.

(2bii) 
Angle about a point = 360°.
Angle between mirror = 360° - 320° = 40°.
No. of images formed by an inclined mirror = 360/∅ - 1, 
Therefore, 360/40-1, 
Therefore, 9 - 1 = 8.
Therefore, Number of images = 8 images.

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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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