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Class 9 · Science · Expert
→In which situation will the validity of an experiment increase the most?
Class 9 · Science · Expert
→In an experiment the amount of water was increased along with temperature. Why did the result become difficult to interpret?
Class 9 · Science · Expert
→A student wants to test the effect of temperature on germination. Which would be an appropriate control group?
Class 9 · Science · Expert
→Which of the following hypotheses is the most falsifiable?
Class 9 · Science · Expert
→If an experimental result contradicts the hypothesis what should the scientist do first?
Class 9 · Science · Expert
→In an experiment only one plant was kept in sunlight and one in shade. What is the best way to make the conclusion more reliable?
Class 9 · Science · Expert
→Which statement is the null hypothesis when testing whether fertiliser increases plant height?
Class 9 · Science · Expert
→A student predicts that greater light exposure will increase plant growth. Which improvement is most necessary to make this prediction a scientific hypothesis?
Class 9 · Science · Medium
→Which statement correctly describes the role of variables in a fair experiment?
Class 9 · Science · Medium
→In an experiment the dependent variable decreases as the independent variable increases. What type of relationship is this?
Class 9 · Science · Medium
→In a filtration experiment which variable becomes uncontrolled if a different cloth is used each time?
Class 9 · Science · Medium
→A student uses different amounts of sand and measures filtration time. What are sand amount and filtration time respectively?
Class 9 · Science · Medium
→Why should the initial temperature be kept the same in a food-heating experiment?
Class 9 · Science · Medium
→A student heats food for different durations and measures its temperature. Which is the independent variable?
Class 9 · Science · Medium
→What difficulty would occur if the surface is changed in a spring-and-car experiment?
Class 9 · Science · Medium
→A student compresses a spring by different distances and measures the distance travelled by a car. Which is the dependent variable?
Class 9 · Science · Medium
→Why is it necessary to keep the initial water level the same in a water-flow experiment?
Class 9 · Science · Medium
→A student measures water flow rate through holes of different sizes. Which is the independent variable?
Class 9 · Science · Medium
→Why is it suitable to take all measurements at the same time in an experiment on soil depth and temperature?
Class 9 · Science · Medium
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