A-LevelPhysicsPhysical quantities and units9702/12 · Oct/Nov 2011 · Q51 Mark

The speedometer in a car consists of a pointer which rotates. The pointer is situated several millimetres from a calibrated scale. What could cause a random error in the driver's measurement of the car's speed?

AThe car's speed is affected by the wind direction.

BThe driver's eye is not always in the same position in relation to the pointer.

CThe speedometer does not read zero when the car is at rest.

DThe speedometer reads 10% higher than the car's actual speed.

✓ Correct answer

B: The driver's eye is not always in the same position in relation to the pointer.

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2011 Paper 1 Variant 2, question 5.

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