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Variables In An Experiment

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

ScienceOne group uses a new study method and another uses the old method but they take different test papers. Which improvement is most appropriate?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhy must pressure be kept constant while measuring gas volume at different temperatures?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIf a controlled variable gradually changes during an experiment what type of error may appear in the results?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceDistance between a plant and lamp is changed to alter light intensity. How should the independent variable be recorded more accurately?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn which experiment is the dependent variable operationally defined most clearly?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student tests the effect of soil moisture on earthworm number. If all samples are collected only after rainfall which external variable remains poorly controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn an experiment plant growth is measured at five different fertilizer amounts. What is the purpose of using three plants at each amount?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhich statement correctly distinguishes a controlled variable from a control group?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhat is the main advantage of recording the initial resting pulse rate while testing the effect of exercise duration on pulse rate?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 difficulty may occur if the chosen values of the independent variable differ only slightly?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhen investigating the effect of temperature on metal length what measurement is more appropriate if initial lengths are unequal?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhy may percentage of germinated seeds be a better dependent variable than the number germinated in an experiment on salinity?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceReaction rate was measured at four temperatures but a catalyst was also added in the highest-temperature trial. Why is the conclusion doubtful?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student defines the independent variable as the value obtained at the end of an experiment. What is wrong with this statement?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhy is it necessary to give equal amounts of water to all plants when comparing growth in different soils?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn which situation would time be the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA plant's height is measured daily but sometimes from the soil surface and sometimes from the bottom of the pot. What type of problem is this?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student tests whether stirring speed affects dissolving time. Which experiment is the fairest?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceAn experiment tests the effect of sound intensity on concentration. Participants are given questions of different difficulty. Which variable was not controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard