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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।

ScienceA student changes both water temperature and container size while measuring evaporation rate. What is the main flaw in this design?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhat difficulty may occur if the chosen values of the independent variable differ only slightly?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhen investigating the effect of temperature on metal length what measurement is more appropriate if initial lengths are unequal?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhy may percentage of germinated seeds be a better dependent variable than the number germinated in an experiment on salinity?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceA student defines the independent variable as the value obtained at the end of an experiment. What is wrong with this statement?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceIn which situation would time be the independent variable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA plant's height is measured daily but sometimes from the soil surface and sometimes from the bottom of the pot. What type of problem is this?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student tests whether stirring speed affects dissolving time. Which experiment is the fairest?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceWhile testing the effect of surface type on friction the force needed to pull an object is measured. What does this force represent?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student changes the number of batteries and observes bulb brightness. Recording brightness only as dim medium and bright is what type of measurement?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIf an experiment on the effect of fertilizer is conducted using only one plant what is the greatest limitation?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceFour plants receive (50,mL), (100,mL), (150,mL) and (200,mL) of water respectively. How many levels of the independent variable are present?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceWhat is a factor called when it can affect the result but is neither deliberately changed nor controlled in an experiment?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard 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 experimentLevel 11Hard ScienceIn an experiment the rate of photosynthesis first increases and then becomes constant as light intensity rises. What should be placed on the horizontal axis of the graph?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhile measuring the distance travelled by a toy car on different surfaces what type of variable is the surface type?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard