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Class 9 · Science
→If repeated trials produce widely different results what should be the first scientific step?
Class 9 · Science
→Which experimental plan would test a cause and effect relationship most reliably?
Class 9 · Science
→A student records results only for the three fastest germinating seeds. What type of bias is this?
Class 9 · Science
→Which hypothesis would be difficult to test because of a vague term?
Class 9 · Science
→If plants have very different initial heights in an experiment what is the most appropriate analysis?
Class 9 · Science
→In which option is the control group selected correctly?
Class 9 · Science
→A student tests the effect of temperature on sugar dissolving time but uses fine sugar in hot water and large crystals in cold water. What is the main problem?
Class 9 · Science
→Which hypothesis defines both the independent and dependent variables most clearly in operational terms?
Class 9 · Science
→A student tests a treatment on four groups but bases the conclusion only on the group showing the largest effect. What is the most appropriate improvement?
Class 9 · Science
→What is the main benefit of using measurement intervals decided before an experiment?
Class 9 · Science
→A student writes the experimental procedure so vaguely that another student cannot repeat it. Which scientific quality is affected?
Class 9 · Science
→A student investigates change in plant mass but measures the total mass including the pot and soil. What is the main limitation?
Class 9 · Science
→Even after increasing the number of measurements all readings remain biased in the same wrong direction. What does this suggest?
Class 9 · Science
→An investigation finds that plants receiving more water were taller. What conclusion cannot be drawn from this relationship alone?
Class 9 · Science
→If an observer knows which sample received treatment and unintentionally scores it more favourably what is this an example of?
Class 9 · Science
→A student slightly changes the procedure after every trial but averages all results together. What is the problem?
Class 9 · Science
→A student says the hypothesis is correct because one trial gave the expected result. What is the most scientific response?
Class 9 · Science
→A student measures mass using two different balances and finds a constant difference between them. What is the most appropriate check?
Class 9 · Science
→In which situation should caution be used when applying results to wider conditions?
Class 9 · Science
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