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Class 9 · Science
→A student changes the distance from a magnet and measures attraction force. Changing distance from (2,\text{cm}) to (10,\text{cm}) is an example of what?
Class 9 · Science
→In an experiment enzyme activity is measured at four temperatures. A different enzyme concentration is used at each temperature. Why are the results unreliable?
Class 9 · Science
→If the effect of sound intensity on concentration is investigated which would be the most suitable dependent variable?
Class 9 · Science
→A student investigates the relationship between fertilizer amount and number of leaves. The plants are kept in pots of different sizes. What can pot size become?
Class 9 · Science
→An experiment tests the effect of water temperature on dissolving rate. The amount of sugar is also changed with temperature. What is the main problem?
Class 9 · Science
→While testing the effect of wing length on the flight distance of a paper airplane each airplane is thrown with the same force. What type of variable is the kept-same force?
Class 9 · Science
→In an experiment on the effect of temperature on seed germination the percentage of germinated seeds is recorded. Which is the dependent variable?
Class 9 · Science
→A student investigates the effect of light duration on plant growth. The student changes light duration and measures plant height. Which is the independent variable?
Class 9 · Science
→In an experiment average plant growth increased as fertilizer amount increased but soil acidity was not measured. Which is the most scientific conclusion?
Class 9 · Science
→A student always tests low temperatures first and high temperatures last. The apparatus gradually warms over time. Which improvement will reduce the order effect?
Class 9 · Science
→Large and small limestone pieces are used to test the effect of particle size on reaction rate. What should be equal for a fair comparison?
Class 9 · Science
→In which option have the independent and controlled variables been incorrectly exchanged?
Class 9 · Science
→A student says that it is always possible to keep every controlled variable exactly identical. Which evaluation is most appropriate?
Class 9 · Science
→In an experiment on the effect of temperature on plant growth the chambers at different temperatures also have different light levels. What is the best solution?
Class 9 · Science
→Only one measurement was taken at each value of the independent variable. Which change would make the results more reliable?
Class 9 · Science
→A student changes the distance between a magnet and an iron nail and measures attraction force. Which factor should be controlled?
Class 9 · Science
→Plant growth is measured under different colours of light. What type of independent variable is light colour?
Class 9 · Science
→An experiment has a continuous independent variable. What does this mean?
Class 9 · Science
→One group uses a new study method and another uses the old method but they take different test papers. Which improvement is most appropriate?
Class 9 · Science
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