NECO 2019 Physics (Practical) Question & Answers June/July Expo Runs

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NECO 2019 Physics (Practical) Question & Answers June/July Expo Runs

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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|
(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;

(1ix)GRAPH: CLICK HERE FOR THE GRAPH – EDITED

(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.

(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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