Neco 2025 Physics Question 47

Practice objective / multiple choice question 47 from the 2025 Neco Physics examination.

Neco 2025 Physics Objective / Multiple Choice Hard Difficulty
Question 47 NECO • 2025 • PHYSICS • objective

A student measures the period of a simple pendulum of length \(0.98\ \text{m}\) using a stopwatch. After timing 20 complete oscillations, the total recorded time is \(40.2\ \text{s}\). The length measurement has an uncertainty of \(\pm0.005\ \text{m}\) and the stopwatch has a reaction‑time uncertainty of \(\pm0.2\ \text{s}\) per timing. Using \(g = \frac{4\pi^{2}L}{T^{2}}\) (with \(\pi = 3.1416\)), calculate the percentage error in the experimentally determined value of \(g\) arising from the combined uncertainties, and state the single most effective precaution the student could adopt to reduce this overall percentage error.

Answer Options

A. Percentage error ≈ 2.35 %; most effective precaution - use a longer pendulum to increase the period.
B. Percentage error ≈ 1.50 %; most effective precaution - measure the length with a more precise ruler.
C. Percentage error ≈ 0.85 %; most effective precaution - calibrate the stopwatch before each measurement.
Correct Answer D. Percentage error ≈ 1.12 %; most effective precaution - increase the number of swings timed to reduce stopwatch reaction‑time uncertainty.
Correct Answer
D
Correct Option:
Percentage error ≈ 1.12 %; most effective precaution - increase the number of swings timed to reduce stopwatch reaction‑time uncertainty.

About This Question

This is Neco 2025 Physics Question 47. It is one of the objective questions from the 2025 Neco Physics examination.

Difficulty level: Hard .

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