Neco 2021 Physics Question 18

Practice objective / multiple choice question 18 from the 2021 Neco Physics examination.

Neco 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 18 NECO • 2021 • PHYSICS • objective

In a simple pendulum experiment the length of the string is measured with a meter rule as \(0.500\,\text{m}\) with a systematic uncertainty of \(\pm0.001\,\text{m}\). The period of the pendulum is timed ten times with a stopwatch, giving the values (in seconds): 2.01, 2.04, 2.00, 2.03, 2.02, 2.05, 2.01, 2.03, 2.02, 2.04. The reaction‑time uncertainty of the stopwatch is \(\pm0.02\,\text{s}\) (random).\n\n(a) Determine the best estimate of the acceleration due to gravity \(g\) and its combined standard uncertainty, assuming all uncertainties are independent.\n(b) Identify the dominant source of error and suggest one practical precaution to reduce it.

Answer Options

Correct Answer A. g = 4.82 ± 0.04 m·s⁻²; dominant error = timing; precaution = use electronic/photogate timing
B. g = 4.82 ± 0.06 m·s⁻²; dominant error = reaction time; precaution = repeat timing many times
C. g = 4.90 ± 0.05 m·s⁻²; dominant error = length; precaution = use finer\/calibrated meter rule
D. g = 4.78 ± 0.04 m·s⁻²; dominant error = systematic; precaution = calibrate stopwatch
Correct Answer
A
Correct Option:
g = 4.82 ± 0.04 m·s⁻²; dominant error = timing; precaution = use electronic/photogate timing

About This Question

This is Neco 2021 Physics Question 18. It is one of the objective questions from the 2021 Neco Physics examination.

Difficulty level: Hard .

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