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Practical Investigation · Part 2 of 4
6 exam-style questions with model answers, plus 8 quick multi-choice questions — every question on this part of the standard, grouped by the 2 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
A student times a pendulum by measuring 10 complete oscillations and dividing by 10. State the name given to this kind of improvement, and state what it improves.
Explain why using a fiducial marker at the centre of a pendulum's swing gives more accurate timings than starting and stopping the stopwatch at the highest point of the swing.
A student investigating how the illuminance from a lamp depends on distance takes single readings with a light meter, in a room with the ceiling lights on and a window nearby. Evaluate the accuracy of this method and justify two specific changes.
State which variable goes on each axis of your graph, and state two things every axis label must include.
A student calculates the gradient of their linearised graph using two points taken straight from their results table. Explain why this reduces the quality of their analysis, and explain what they should do instead.
A student's linearised graph has five points lying close to a straight line through the origin and one point well above the line. Discuss how they should handle this point in their analysis and in their write-up.