A student conducts an experiment to determine the resistivity of a constantan wire. They measure the resistance of different lengths of the wire using a digital multimeter and measure the wire's diameter using a micrometer screw gauge.
Which of the following would introduce a systematic error in the determined resistivity of the wire?
The contact resistance between the connection clips and the wire varies slightly each time they are repositioned.
Small fluctuations in the laboratory room temperature cause the resistance of the wire to vary slightly throughout the experiment.
The micrometer screw gauge has a zero error, consistently reading +0.03 mm+0.03\text{ mm}+0.03 mm when the jaws are fully closed.
The student experiences parallax error by reading the metre ruler from slightly different angles for each length measurement.
44 exam-style questions on OCR GCSE Biology Practical skills. Each one has a worked solution and a mark scheme showing where the marks go.