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Class 9 · Science
→A student measures reaction rate by recording total time until gas formation stops. If the final gas volume differs each time why may the comparison be unfair?
Class 9 · Science
→When is the internal validity of an experiment highest?
Class 9 · Science
→A student uses a line graph for data consisting of separate categories. What would be a more suitable presentation?
Class 9 · Science
→Units are missing from an experimental data table. What is the main problem?
Class 9 · Science
→Which type of result would provide the strongest evidence against a hypothesis?
Class 9 · Science
→A student measures length five times but starts from a different position each time. What is the most likely cause of variation?
Class 9 · Science
→If the control group shows the same change as the treatment group what may this indicate?
Class 9 · Science
→A student tests metal reaction at different acid concentrations. The acid volume differs in each trial. What effect may this have?
Class 9 · Science
→What is the main benefit of randomly assigning samples to groups in an experiment?
Class 9 · Science
→What is the expected result of a negative control in a scientific investigation?
Class 9 · Science
→A student measures five millilitres of liquid using a cylinder whose smallest division is ten millilitres. What is the main problem?
Class 9 · Science
→Results follow the expected direction but the difference is very small and comparable to measurement error. What is the most appropriate conclusion?
Class 9 · Science
→A student tests seed germination at three temperatures but uses a different seed type at each temperature. Why will interpretation be difficult?
Class 9 · Science
→What is the main purpose of using a blind test in an investigation?
Class 9 · Science
→In which situation can calculating the mean be misleading?
Class 9 · Science
→A student concludes that red light increases plant growth but used only one plant. What is the most appropriate evaluation?
Class 9 · Science
→If an experimental result changes greatly on repetition what should be reviewed first?
Class 9 · Science
→A student tests the relationship between sound intensity and distance. Why is using a different room at each distance inappropriate?
Class 9 · Science
→A temperature instrument records only whole-number values while small changes are expected. What is the main limitation?
Class 9 · Science
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