# WAEC 2021 Physics Practical Answer – May/June Expo

WAEC PHYSICS PRACTICAL

(1axi)
1.Avoided parallax error in reading metre rule

2.Noted zero error on the meter rule

(1bi)
i.Bungee Jumping

(1bii)
Gravity of a body is a downward pull or force that the earth exerts on your body.It is point at which the combined mass of the body appears to be concentrated.
it is the point where the weight of the body acts or appears to act.

1bi. A period of an oscillatory motion is a motion taking place to and fro or back and forth about a fixed point.

(1bii)
_(Pick any two you like)_

MASS
¶ it is the measure of the amount of matter present in a body.

WEIGHT
¶ it refers to the measure of force that acts on mass because of acceleration due to gravity

MASS
¶ S.I Unit of mass is Kilogram (Kg)

WEIGHT
¶ S.I Unit of weight is Newton (N)

MASS
¶ It’s a scalar quantity. It has only magnitude no direction

WEIGHT
¶ It’s is a vector quantity. It has magnitude and direction.

MASS
¶ we measure it using ordinary balance. E.g pan balance, e.tc

WEIGHT
¶ we can measure weight using a spring balance.
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NUMBER 2 ===================================

NUMBER 3   (3av)
Tabulate

S/N ||1 || 2 || 3 || 4 || 5

d(cm) || 80.00|| 70.00 || 50.00 || 40.00 || 30.00

I(A) || 0.30||0.35 || 0.40|| 0.45||0.50 ||

(I)^-¹ ||3.333 ||2.857 ||2.500 || 2.222||2.000 ||

(3avii)
from the graph, Slope s, = ∆d/∆I^-¹
= 71 – 20 ÷ 3 – 1.75
= 51/1.25
= 40.8cmA
Or 0.408Am

(3aviii)
(i) I ensured tight connections
(ii) I avoided error due to parallax while reading the ammeter

(bi)
(i) Straight at the magnetic field
(ii) The number of turns of it’s coils

(3bii)
Given:
Diameter

GOODLUCK!!!