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Confounding Variable

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

ScienceA student tests the effect of temperature on bacterial growth but allows different temperature groups to grow for different durations. What type of variable has incubation time become?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceAn experiment tests the effect of water depth on pressure. Liquids of different densities are used at different depths. What difficulty does this create?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA 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 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceAn 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 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard 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 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 investigates the effect of temperature on enzyme activity. What happens if a different amount of enzyme is used at each temperature?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceA student claims that music increases plant growth. Plants with music were kept near a window while plants without music were kept in a dark corner. What is the main confounding variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn an experiment seed germination was measured at different temperatures but each group contained a different number of seeds. What problem will this cause?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard ScienceIn an experiment the amount of water was increased along with temperature. Why did the result become difficult to interpret?Class 9Exploration: Entering the World of Secondary ScienceHypothesis and experimentationExpert 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 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 investigates how fan speed affects cloth drying time. What happens if the amount of water in the cloth differs?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIn an experiment on exercise and pulse rate what additional variable may affect the result if different students are used?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceA student measures sugar dissolving time at different temperatures. What problem occurs if the amount of sugar differs in each trial?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIf plants exposed to louder sound also receive more fertiliser what will fertiliser amount be called?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat is the main error if a large ice piece is placed in a warm location and a small one in a cold location?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhat effect will using a different amount of salt in every trial have on the experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceWhy will the conclusion be weak if the cloth in sunlight is large and the cloth in shade is small?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium ScienceIf pot size also differs among pots containing different soils what will pot size be called?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentMedium