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Exploration Entering The World Of Secondary Science

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

SciencePulse 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 experimentHardScienceAn 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 experimentHardScienceWhile testing the effect of wing length on the flight distance of a paper airplane each airplane is thrown with the same force. What type of variable is the kept-same force?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment on the effect of temperature on seed germination the percentage of germinated seeds is recorded. Which is the dependent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student investigates the effect of light duration on plant growth. The student changes light duration and measures plant height. Which is the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment average plant growth increased as fertilizer amount increased but soil acidity was not measured. Which is the most scientific conclusion?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student always tests low temperatures first and high temperatures last. The apparatus gradually warms over time. Which improvement will reduce the order effect?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceLarge and small limestone pieces are used to test the effect of particle size on reaction rate. What should be equal for a fair comparison?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn which option have the independent and controlled variables been incorrectly exchanged?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student says that it is always possible to keep every controlled variable exactly identical. Which evaluation is most appropriate?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceIn an experiment on the effect of temperature on plant growth the chambers at different temperatures also have different light levels. What is the best solution?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceOnly one measurement was taken at each value of the independent variable. Which change would make the results more reliable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceA student changes the distance between a magnet and an iron nail and measures attraction force. Which factor should be controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardSciencePlant growth is measured under different colours of light. What type of independent variable is light colour?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHardScienceAn experiment has a continuous independent variable. What does this mean?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentHard

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