WAEC Physics Practical Answer – 2020 Expo

WAEC 2020 Physics Practical Expo Answer
 2020 Waec Physics Practical Answers
(1a) 
(xi) PRECAUTIONS 
(i) I ensured that the meter rule balances horizontally before readings are taken in order to avoid experimental error. 
(ii) I ensured that parallax error was avoided when taking the readings on The meter rule by viewing its calibration vertically. 
(1bi) Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.
Moment of a force = force * Perpendicular distance of its line of action from the point
Moment = F * L
The S.I unit is Newton-meter(Nm). 
It is a vector quantity
(1bii) 
(Click here to view the image)
x=50-25
=25cm. 
y=80-50
=30cm. 
From the principle of moment:
Sum of clockwise moment = Sum of anti-clockwise moment 
60 * x=m * y
60 * 25 = m * 30
Divide both sides by 30
60 * 25/30 = m *30/30
m=60 * 25/30
m=2 * 25
m=50g. 
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(2)
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(3a) 
(i) E=3.00v
TABULATE.
R(n); 1.0|2.0|4.0|6.0|8.0
I(A)0.40|0.35|0.28|0.22|0.18|
V(v)0.65|0.58|0.50|0 45|0.40| 
(3bi)
(Pick any 2)
(i) connecting cells in parallel adds the current capacities together.
(ii) connecting cells in parallel provides alternative Pathways for Current flows.
(iii) When cells are connected in parallel the Total voltage provided do not change
(3bii) 
(Pick any 2)
(i) Resistance.
(ii) Tolerance.
(iii) Rated Power Dissipation.
(iv) Package and mounting.
(iv) Voltage rating. 

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