Question detail
Which choice improves validity in a ruler-drop reaction-time investigation?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The human nervous system
Question
- A. Dropping the ruler from the same starting position each trial
- B. Changing the hand used for every repeat
- C. Telling the participant exactly when the ruler will drop
- D. Using a different ruler scale for each trial
Answer
The correct option is Dropping the ruler from the same starting position each trial. This is the best answer because it directly matches the learning objective to apply safe and valid practical design to reaction-time investigations, including control variables, repeats and calculation of mean values.
Explanation
The correct option is Dropping the ruler from the same starting position each trial. Dropping the ruler from the same starting position each trial supports the answer because it fits Structure and function in The human nervous system and uses the required AQA GCSE Biology context. The objective asks students to apply safe and valid practical design to reaction-time investigations, including control variables, repeats and calculation of mean values, so the explanation must connect the option to that exact skill or idea. The other options are incorrect because "Changing the hand used for every repeat", "Telling the participant exactly when the ruler will drop", "Using a different ruler scale for each trial" do not match the specific approved objective or practical context.
Common mistake
Ignoring Control Variables
Students often forget to identify and control variables that could affect the outcome of their reaction-time investigations.
Ensure to list all potential variables and explain how you will keep them constant throughout the experiment.
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