waec 2025 physics practical questions and answers –obj-essay-oral
Posted by Jack Johnson 
on
27 May 2025 5:55 AM
CAT
WAEC 2025 Physics Practical Questions and Answers (Sample Practice)
Question 1: (Using a Meter Rule and a Knife Edge)
You are provided with a uniform meter rule, a knife edge, and some known weights.
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Procedure:
Balance the meter rule on the knife edge and note the center of gravity.
Suspend a known mass (e.g., 50g) on one side and balance it with the meter rule on the other side.
Record positions and calculate using the principle of moments.
Data Table:
Mass (g) Distance from Knife Edge (cm) Moment (gcm)
50 20 1000
Formula:
Moment
=
Force *
Distance
Moment=Force×Distance
Observation:
The balancing point changes depending on the applied mass.
Conclusion:
The principle of moments is verified since the clockwise and anticlockwise moments are equal.
Question 2: (Using a Pendulum)
You are provided with a retort stand, string, pendulum bob, and stopwatch.
Procedure:
Tie a pendulum of length 60 cm.
Displace and release it.
Record time for 20 oscillations.
Repeat for different lengths.
Data Table:
Length (cm) Time for 20 oscillations (s) Period T (s)
60 27 1.35
Formula:
𝑇
=
Time
20
,
𝑇
=
2
𝜋
𝑙
𝑔
T=
20
Time
,T=2π
g
l
Graph:
Plot
𝑇
2
T
2
on the y-axis and
𝑙
l on the x-axis.
Conclusion:
The slope of the graph helps determine the acceleration due to gravity (g ≈ 9.8 m/s²
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