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

ScienceA student applies the values of the independent variable in a random order. What is the main advantage?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceTo investigate the effect of surface area on evaporation rate which dependent variable is most clearly defined?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceAn 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 experimentHardScienceIf the question is whether wire length affects its resistance which is the appropriate variable pair?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 experimentHardScienceA student investigates how ramp angle affects the speed of a toy car. The car is released from a different starting point in each trial. Which conclusion is appropriate?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 experimentHardScienceIn an experiment the number of batteries is changed and bulb brightness is rated on a scale from one to five. Which statement is correct?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student claims that plant species is the dependent variable because the plant is observed at the end. Why is this claim incorrect?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIf only two very close values of the independent variable are used in an experiment what is the main difficulty?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment temperature is continuously measured but not deliberately changed. If temperature can affect the result what type of variable is it?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceWhile testing the effect of salt concentration on the mass of potato pieces the initial masses differ. What is the best improvement?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 experimentHardSciencePulse rate is measured after exercise in two groups. One group runs for five minutes and the other cycles for ten minutes. What is the biggest flaw in this design?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment on light intensity and photosynthesis bubbles released per minute by an aquatic plant are counted. What does the bubble count represent?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student changes the distance from a magnet and measures attraction force. Changing distance from (2,\text{cm}) to (10,\text{cm}) is an example of what?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 experimentHardScienceIf the effect of sound intensity on concentration is investigated which would be the most suitable dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA 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

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