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Practical Investigation · Part 1 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.
State the minimum number of values of the independent variable required for this standard, and state one reason why collecting more than the minimum is better.
A student writes the conclusion: "The graph was a curve, so the relationship is non-linear." Explain why this conclusion would not reach Merit, and rewrite it so that it would.
A student proposes to investigate how the current through a resistor depends on the voltage across it. Evaluate this choice as an investigation for AS91168, and suggest a change that would make it suitable.
A student investigates how the current through a lamp depends on the voltage across it. Identify the independent and dependent variable.
Explain why a trial run, before collecting the full set of results, improves the quality of an investigation.
A student's pendulum investigation used only three lengths, all between 40 cm and 45 cm, with a single reading at each length. Evaluate this design and explain what should change.