Physics 5054 · O Level · Physical quantities and measurement techniques
Physical quantities and measurement techniques — practice question
Fig. 4.1 shows a large empty reel that was used for ribbon. The central cylinder has a diameter of about $3\,\text{cm}$. Two students use different methods to determine the diameter of the central cylinder.
(a)[1]
Describe how the student can use the ruler and the apparatus shown in Fig. 4.2 to measure the diameter.
(b)[4]
The other student measures the diameter using only these items: metre rule, pencil, Blu‑tack, one metre of thin thread. Describe clearly how she can obtain an accurate value for the diameter.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apparatus just fits across the diameter of the cylinder” …