Neco 2022 Physics Question 47

Practice objective / multiple choice question 47 from the 2022 Neco Physics examination.

Neco 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 47 NECO • 2022 • PHYSICS • objective

A student measures the period of a simple pendulum by timing 20 oscillations three times, obtaining \(40.2\ \text{s}\), \(39.8\ \text{s}\) and \(40.0\ \text{s}\). The length of the pendulum is measured with a meter rule as \(1.00\ \text{m}\) with an uncertainty of \(\pm0.5\ \text{cm}\).\n\n(a) Calculate the percentage random error in the period.\n(b) Assuming the length uncertainty is the only systematic error, calculate the percentage systematic error in the derived value of \(g\).\n(c) State one practical precaution to reduce the random error and one to reduce the systematic error.

Answer Options

A. (a) 0.5 % (b) 1.0 % (c) Random error - use a stopwatch with finer resolution; Systematic error - measure length at the centre of mass.
B. (a) 0.25 % (b) 0.5 % (c) Random error - repeat timing many times; Systematic error - calibrate the meter rule.
C. (a) 0.75 % (b) 0.25 % (c) Random error - average the three timing results; Systematic error - perform the experiment in a vacuum.
Correct Answer D. (a) 0.5 % (b) 0.5 % (c) Random error - repeat timing many times; Systematic error - use a more precise length measuring instrument.
Correct Answer
D
Correct Option:
(a) 0.5 % (b) 0.5 % (c) Random error - repeat timing many times; Systematic error - use a more precise length measuring instrument.

About This Question

This is Neco 2022 Physics Question 47. It is one of the objective questions from the 2022 Neco Physics examination.

Difficulty level: Hard .

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