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Controlled Variable

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

ScienceIn an experiment, the increase in spring length caused by different loads is measured. If a different spring is used in every trial, which variable has not been controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMediumScienceA student investigates how fan speed affects the drying time of wet cloth. If the initial water mass in the cloth pieces differs, what is the most appropriate action?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMediumScienceA 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 experimentMediumScienceA student drops a ball from four different heights and measures its bounce height. If a different type of ball is used each time, what is the most appropriate improvement?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMediumScienceWhich option lists the independent, dependent, and controlled variables in the correct order when testing the effect of fertilizer amount on plant dry mass?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMediumScienceA student investigates whether music type affects reading speed. The sound intensity differs between music types. What should be done for a fair test?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceWhile measuring the period of pendulums of different lengths the mass of the bob is kept constant. What is the purpose of keeping mass constant?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn which situation should age be a controlled variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardSciencePlants are grown in four soil types but each soil receives a different amount of water. What should be done to isolate the effect of soil type?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn the same experiment liquid volume is measured using different measuring cylinders with different precision. This problem is related to which variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceTo test the effect of acid concentration on reaction time which variable is most essential to keep the same?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student tests the effect of soap amount on foam height. The bottle is shaken a different number of times in each trial. What should be done with the number of shakes?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment enzyme activity is measured at four temperatures. A different enzyme concentration is used at each temperature. Why are the results unreliable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceWhile 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 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceLarge 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 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn which option have the independent and controlled variables been incorrectly exchanged?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn 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 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student changes the distance between a magnet and an iron nail and measures attraction force. Which factor should be controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceWhy must pressure be kept constant while measuring gas volume at different temperatures?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIf 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

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