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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।

ScienceWhich statement correctly distinguishes a controlled variable from a control group?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 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 ScienceWing length of a paper aeroplane is changed and flight distance is measured. Which factor is most appropriate to control?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn comparing the cleaning ability of three soaps a different type of stain was placed on each cloth. Why would the result be unreliable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student measures the time period of pendulums of different lengths. What should be kept constant for a fair test?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceWhen testing the effect of light what type of decision is giving the same amount of water to all groups?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert 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 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 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 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 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 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 ScienceWhy should the duration be kept the same in an experiment on leaf area and water loss?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy is it necessary to release the car from the same point each time in a ramp experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy is it necessary to keep the bulb type the same in an experiment on voltage and brightness?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat difficulty arises if plants have different initial heights in a fertilizer experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat is the main reason for keeping the initial push the same in a toy-car experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhich is the most suitable controlled variable in an experiment on lamp distance and light intensity?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy should the initial amount of water be kept the same in the salt and boiling point experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium