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Neco 2019 Physics Practical Questions and Answers – Free Expo/ Runz

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Neco 2019 Physics Practical Questions and Answers – Free Expo/ Runz by : 1:00 pm On June 9, 2019

Neco 2019 Physics Practical Questions and Answers – Free Expo/ Runz

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Practical – Physics — 10:00am – 12:45pm
(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|


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GRAPH1: CLICK HERE FOR THE GRAPH
Neco practical answers
GRAPH2: CLICK HERE FOR THE GRAPH
NECO Physics Practical
(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
neco physics practical answers

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

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

neco physics answers
(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
Neco Physics answers
(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

PHYSICS PRACTICAL SPECIMEN:
QUESTION 1
-Knife edge
-Meter rule
-100g and 150g masses
-Thread
Question 2
-Four thumb pins
-Four optical pins
-Drawing paper
-Drawing board
-Rectangular glass prism
Question 3
-Plug key
-Connecting wires
-Ammeter (0.2A or 0-3A)
-Voltmeter (0-3V)
-2Ω standard resistor covered and labelled Q
-Jockey
-2 × 15V dry Leclanche cell or 2V Accumulator
-1.2 constantan wire (SWG 26)
-Crocodile clip
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See the Previous Neco Physics Answers below
3aiii)
Vo=0.35V
TABULATE
S/N:1,2,3,4,5,6
R(ohm):1.0,2.0,3.0,4.0,5.0,6.0
V(v):1.40,1.65,1.80,2.00,2.10,2.15
R^-1(ohm^-1):1.000,0.500,0.333,0.200,0.167
V^-1(v^-1):0.714,0.606,0.556,0.500,0.476,0.465
3aiv)
DRAW THE GRAPH of V^-1(v^-1) against R^-1
3av)
Slope=change inV^-1/Change inR^-1
=(7.6-4.3)/(0.84-0.10)
3.3/0.74
=4.460
3avi)
Intercept=0.385
3avii)
I=0.385
I^-1=(0.385)^-1
=2.597
3aviii)
-I ensured tight connections
-I avoided error due to parallax when reading the voltmetre
-I ensured the key is opened after each reading to prevent the cell from running down
3bi)
The potential difference between two points in an electric circuit is the work done when a coulomb of charge passes between the points in an electric circuits
3bii)
E=I(R r)
where E=e.m.f of the cell
Therefore E=IR Ir=V Ir
Where :
V=IR=P.d lost across the external resistance of the cell
Ir=Pd lost across the internal resistance of the cell
E=e.m.f=workdone across external resistance of the cell

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