NECO 2019 Physics Practical Answer – June/July Expo

NECO Physics Practical Solution Questions and Answer – JUNE/JULY 2019 Expo Runz.

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1)
Centre of gravity C G = 50.0cm
Tabulate
Y(cm). |10|15|20|25|30|
K(cm). |31.2|33.5|36.0|38.2|40.6|
X(cm). |21.2|18.5|16.0|13.2|10.6|
K¹(cm). |27.0|29.7|33.0|35.5|38.4|
X¹(cm). |17.0|14.7|13.0|10.5|8.4|

(1ix)
Note: Use any of the graph
GRAPH1: CLICK HERE FOR THE GRAPH
GRAPH2: CLICK HERE FOR THE GRAPH

(1x)
Slope = increase in y-axis /increase in x-axis
From the graph, 
Slope = (35-10)cm/(16-6)cm
Slope (s) = 35/10=2.5

(1xi)
K =M1-Sm/S-1 
M1= 100g , Sm =50m , S =2.5
K = 100-50/2.5-1 = 50/1.5
= 500/15=100/3
= 33.3g/cm

(1xii)
(i)i avoided drought by closing the window
(ii)i avoided error due to parallax when reading the meter rule 

(1bi)
couple is a pair of forces, equal in magnitude, oppositely directed, and displaced by perpendicular distance or moment.
(1bii)
CLICK HERE FOR THE IMAGE
Let the mass of beam = m
Taking moment about point C 5cm clockwise = sum of anitclockwise i;e moment
;- 50*0.5=mx0.2
m=50*0.5/02=250/2=125g
Mass of the beam = 125g

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(3a)
CLICK HERE FOR THE IMAGE - COMPLETE SOLUTION

(v) E=3.0v
(vii) Tabulate
Under L(cm): 20.0; 30.0; 40.0; 50.0; 60.0; 70.0; 
Under I(A): 0.70; 0.60; 0.55; 0.50; 0.45; 0.40; 
Under X=E/I(Ohms): 4.2857; 5.0000; 5.4545; 6.0000; 6.6667; 7.5000;

(3) GRAPH:
CLICK HERE FOR THE GRAPH

(3ix)
Slope = ΔL/Δx = 66-12/7-4 = 54/3=18cm/ohms
Intercept, C (couldn't be shown on graph) 
(3x)
Evaluating K =4.9 10^-7 S
K =4.9 × 10^-7 × 18
K=8.82 × 10^-6cm/ohms
(3xi)
- I ensured tight connections 
- I avoided error due to parallax on the ammeter 

(3bi) 
- Keep the top or terminals clean 
- Do not tighten or removed cables while charging or discharging 
(3bii) Using ohms law, R = V/I=3.5/0.25
=14ohms

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COMPLETED

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