WAEC PHYSICS PRACTICAL ANSWERS 2020 FREE

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Thursday 20th August 2020
Physics 3(Practical) (Alternative A)(1st set) – 9:30 – 12:15pm
Physics 3(Practical) (Alternative A)(2nd set) – 12:45pm – 3:30pm


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(1)
TABULATE:
S/N: 1,2,3,4,5
M(g):40.0,60.0,80.0,100.0,120.0
x(cm):37.50,25.0,18.75,15.00,12.50
x^-1(cm^-1):0.027,0.40,0.053,0.067,0.08
x^-1(*10^-3):27.00,40.00,53.00,67.00,80.00
Note: G=50.0cm Y=30.0cm
(1axi)
-I ensured that the metre rule balances horizontally before readings are taken inorder to avoid experimental error
-I ensured that parallax error was avoided when taking the readings on the metre rule by viewing mit calibrations vertically
(1bi)
The moment of a force about a point is defined as the effect of the force about the point
Moment of a force=Force x perpendicular distance of a line of action from the point
Moment=F*L
The S.I untiy is Newtonmetre(Nm
It is a vector quantity
(1aii)
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=mxy
(60*25)/30=(m*30)/30
M=(60*25)/30
M=50g
(for image and graph copy and paste on browser):

{https://i.imgur.com/WEUz5kv.jpg}
{https://i.imgur.com/oghpZxJ.jpg}
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(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

By skunty empire