Question 35 – Practical skills - OCR GCSE Physics Questions

A student wants to determine the Young modulus of a metal wire of nominal length 2.5 m and nominal diameter 0.38 mm.

To do this, the student must measure:

Which combination of measuring instruments is most suitable to minimise the percentage uncertainty in these measurements?

\begin{array}{|c|c|c|} \hline & \textbf{Original length} & \textbf{Diameter} \\ \hline \textbf{A} & 30\text{ cm ruler} & \text{Vernier calipers} \\ \hline \textbf{B} & \text{Metre ruler} & \text{Micrometer screw gauge} \\ \hline \textbf{C} & 30\text{ cm ruler} & \text{Micrometer screw gauge} \\ \hline \textbf{D} & \text{Metre ruler} & \text{Vernier calipers} \\ \hline \end{array}

$ruler30\text{ cm ruler}$ and $calipers\text{Vernier calipers}$

$ruler\text{Metre ruler}$ and $gauge\text{Micrometer screw gauge}$

$ruler30\text{ cm ruler}$ and $gauge\text{Micrometer screw gauge}$

$ruler\text{Metre ruler}$ and $calipers\text{Vernier calipers}$

A student wants to determine the Young modulus of a metal wire of nominal length 2.5 m and nominal diameter 0.38 mm.

To do this, the student must measure:

Which combination of measuring instruments is most suitable to minimise the percentage uncertainty in these measurements?

\begin{array}{|c|c|c|} \hline & \textbf{Original length} & \textbf{Diameter} \\ \hline \textbf{A} & 30\text{ cm ruler} & \text{Vernier calipers} \\ \hline \textbf{B} & \text{Metre ruler} & \text{Micrometer screw gauge} \\ \hline \textbf{C} & 30\text{ cm ruler} & \text{Micrometer screw gauge} \\ \hline \textbf{D} & \text{Metre ruler} & \text{Vernier calipers} \\ \hline \end{array}

$ruler30\text{ cm ruler}$ and $calipers\text{Vernier calipers}$

$ruler\text{Metre ruler}$ and $gauge\text{Micrometer screw gauge}$

$ruler30\text{ cm ruler}$ and $gauge\text{Micrometer screw gauge}$

$ruler\text{Metre ruler}$ and $calipers\text{Vernier calipers}$

Practical skills