CAIE A-Level Physics AS P3.5 Graph Interpretation and Uncertainties Questions

Practise converting between absolute and percentage uncertainties and combining fluctuating current readings with the stated accuracy of a digital meter.

Exam points

Convert an absolute measurement uncertainty into a percentage using uncertainty divided by the measured value.
Convert a percentage uncertainty into an absolute uncertainty with the same units as the measured length.
Combine half the range of fluctuating readings with the stated meter accuracy to report current and its uncertainty.

[Maximum number: 1]

A digital meter has an accuracy of $\pm 1 \%$ .
The meter is used to measure the current in an electrical circuit.
The reading on the meter varies between 3.04 A and 3.08 A .
What is the value of the current, with its uncertainty?

$(3.06 \pm 0.02) \mathrm{A}$

$(3.06 \pm 0.04) \mathrm{A}$

$(3.06 \pm 0.05) \mathrm{A}$

$(3.06 \pm 0.07) \mathrm{A}$

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CAIE A-Level Physics AS P3.5 Graph Interpretation and Uncertainties Questions question 1