PHYSICS PRACTICAL
Password is "1330"

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Getway - 18th, August 2020
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2020 WAEC PHYSICS PRACTICAL QUESTIONS AND ANSWERS
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PRACTICAL STARTS BY 9:30am

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(1axi)
PRECAUTIONS
(i) I ensured that the metre 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 metre rule by viewing its calibrations vertically.

(1bi)
The moment of a force about a point is defined as the effect of force about that point.
Moment of a force = force × perpendicular distance of its line of action from the point.

Moment = F × h
The S.I unit is Newton-metre(Nm). It is a vector quantity

(1bii)
Draw the diagram

X = 50 - 25 = 25cm
y = 80 - 50 = 30cm
From the principle of moment :
Sum of clockwise moment = sum of anticlockwise moment
60x = M × y
60×25/30 = M×30/30
M = 60×25/30 = 6×25/3 = 2×25
M = 50g
(1axi)
PRECAUTIONS
(i) I ensured that the metre 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 metre rule by viewing its calibrations vertically.

(1bi)
The moment of a force about a point is defined as the effect of force about that point.
Moment of a force = force × perpendicular distance of its line of action from the point.

Moment = F × h
The S.I unit is Newton-metre(Nm). It is a vector quantity

(1bii)
Draw the diagram

X = 50 - 25 = 25cm
y = 80 - 50 = 30cm
From the principle of moment :
Sum of clockwise moment = sum of anticlockwise moment
60x = M × y
60×25/30 = M×30/30
M = 60×25/30 = 6×25/3 = 2×25
M = 50g

No3bi)

1.connecting cells in parallel adds the current capacities together.
2.connecting cells in parallel provides alternative Pathways for Current flows.
3.When cells are connected in parallel the Total voltage provided do not change

PHYSICS ALT A ANSWERS

1bi)The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis. This is different from the tendency for a body to move, or translate, in the direction of the force. ... It is defined as the product of the force (F) and the moment arm (d).


(3ai)
E = 3.00V
R(ohms) | I(A) | V(v)
1.0 0.40 0.65
2.0 0.35 0.58
4.0 0.28 0.50
6.0 0.22 0.45
8.0 0.18 0.40
(3aix)
(i) I avoided error due to parallax when reading
the ammeter and voltmeter.
(ii) I ensured tight connections.
(3bi)
(i) It increases current supplied.
(ii) It makes up for any defect in any of the
cells.
(3bii)
(i) Resistivity of the wire or coil.
(ii) Length of the material


bi) Dispersion of light is the splitting of white light into its constituent colors due to the refractive index of the surface and the wavelength of the light.