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Class 9 Mcq

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

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 experimentLevel 11Hard ScienceWhile investigating the effect of salt amount on the boiling point of water why is water without salt included?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceIn an experiment the amount of water was changed and the number of leaves was measured. Which is the quantitative dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceIf the effect of acid concentration on the reaction rate with a metal is being tested which pair is correct?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student tests how fan speed affects the drying time of a wet cloth. What is the dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceWhich factor is most important to keep controlled while testing the effect of water temperature on the rate of sugar dissolution?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhile testing the effect of fertilizer amount on plant height what type of variable is plant height?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student investigates the effect of light duration on plant growth. The number of light hours received each day is changed. What is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhich statement correctly describes the role of variables in a fair experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 12Medium 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 experimentLevel 12Medium 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 experimentLevel 12Medium 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 experimentLevel 12Medium ScienceWhy should the initial temperature be kept the same in a food-heating experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 12Medium 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 experimentLevel 12Medium 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 experimentLevel 12Medium 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 experimentLevel 12Medium 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 experimentLevel 12Medium