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Experimental Design

Class 9 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceA student calls room temperature the independent variable but does not change it or set it at different levels during the experiment. What is the best correction?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium SciencePulse rate is measured after exercise in two groups. One group runs for five minutes and the other cycles for ten minutes. What is the biggest flaw in this design?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student changes both water temperature and container size while measuring evaporation rate. What is the main flaw in this design?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhat is a factor called when it can affect the result but is neither deliberately changed nor controlled in an experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceTwo different hypotheses predict the same result. What type of experiment is needed to distinguish between them?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceWhich experimental design would best test a dose-response relationship?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceIn which situation will the validity of an experiment increase the most?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceWhich statement correctly describes the role of variables in a fair experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student tests plant growth at three light levels. What do the three light levels represent?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat is the independent variable when testing the effect of container surface area on evaporation?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIn an experiment two groups are kept under the same conditions but only one group receives a new treatment. What is the untreated group called?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceIn which experiment would a negative control be most useful?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceWhich experimental plan would test a cause and effect relationship most reliably?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert ScienceWhat is the main benefit of randomly assigning samples to groups in an experiment?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceWhat is the main purpose of using a blind test in an investigation?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceA student tests enzyme activity at different temperatures but uses a different amount of enzyme in each sample. Which improvement is most necessary?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceSeed germination was tested in two groups. One group had twenty seeds and the other had only two. What is the main weakness of the conclusion?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceIn which order should a strong scientific investigation be completed?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceA student used a different type of soil for each group in a plant growth experiment. What type of variable did soil become?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard ScienceIf an experiment uses only two widely separated values of the independent variable what limitation arises?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationHard