A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2013 · Q41 Mark

A student carried out an experiment in which an electric current was known to decrease with time. The readings he found, from first to last, were 3.62mA, 2.81mA, 1.13mA, 1.76 mA and 0.90 mA. Which statement could not explain the anomalous 1.13 mA reading?

AHe has reversed the third and fourth readings in the results table.

BHe read the ammeter incorrectly; the reading should have been 2.13mA.

CHe took the current reading at the wrong time.

DThere was a systematic error in the readings from the ammeter.

✓ Correct answer

D: There was a systematic error in the readings from the ammeter.

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2013 Paper 1 Variant 2, question 4.

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