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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।

ScienceWhich statement correctly describes the role of variables in a fair experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIn an experiment the dependent variable decreases as the independent variable increases. What type of relationship is this?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIn a filtration experiment which variable becomes uncontrolled if a different cloth is used each time?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student uses different amounts of sand and measures filtration time. What are sand amount and filtration time respectively?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy should the initial temperature be kept the same in a food-heating experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student heats food for different durations and measures its temperature. Which is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat difficulty would occur if the surface is changed in a spring-and-car experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student compresses a spring by different distances and measures the distance travelled by a car. Which is the dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy is it necessary to keep the initial water level the same in a water-flow experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student measures water flow rate through holes of different sizes. Which is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy is it suitable to take all measurements at the same time in an experiment on soil depth and temperature?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student measures soil temperature at different depths. Which is the dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhich is the most appropriate controlled variable in an experiment on the temperature of coloured surfaces?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student places surfaces of different colours in sunlight and measures temperature. What type of variable is surface colour?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIn a detergent experiment foam height is measured in a different container each time. What problem may occur?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student adds different amounts of detergent and measures foam height. Which variable should be controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy may measuring the time for ten oscillations be more useful than timing one oscillation in a pendulum experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student measures the time for ten oscillations of pendulums of different lengths. Which is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat problem occurs if reactant amounts are not kept the same in a reaction-rate experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student measures the time taken for a reaction to finish at different temperatures. What is reaction time?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium