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Class 9 · Science
→In an experiment the result is recorded as good average or poor. What is the main limitation of this dependent variable?
Class 9 · Science
→The amount of sugar is increased in intervals of (1,\text{g}) and dissolving time is measured. What type of variable is the amount of sugar?
Class 9 · Science
→In an experiment plants receive red blue and green light and biomass is measured after seven days. What type of independent variable is light color?
Class 9 · Science
→In which situation should age be a controlled variable?
Class 9 · Science
→A student applies the values of the independent variable in a random order. What is the main advantage?
Class 9 · Science
→To investigate the effect of surface area on evaporation rate which dependent variable is most clearly defined?
Class 9 · Science
→An experiment tests the effect of water depth on pressure. Liquids of different densities are used at different depths. What difficulty does this create?
Class 9 · Science
→If the question is whether wire length affects its resistance which is the appropriate variable pair?
Class 9 · Science
→Plants 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 9 · Science
→A 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 9 · Science
→In the same experiment liquid volume is measured using different measuring cylinders with different precision. This problem is related to which variable?
Class 9 · Science
→To test the effect of acid concentration on reaction time which variable is most essential to keep the same?
Class 9 · Science
→In 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 9 · Science
→A student claims that plant species is the dependent variable because the plant is observed at the end. Why is this claim incorrect?
Class 9 · Science
→If only two very close values of the independent variable are used in an experiment what is the main difficulty?
Class 9 · Science
→In an experiment temperature is continuously measured but not deliberately changed. If temperature can affect the result what type of variable is it?
Class 9 · Science
→While testing the effect of salt concentration on the mass of potato pieces the initial masses differ. What is the best improvement?
Class 9 · Science
→A 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 9 · Science
→Pulse 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 9 · Science
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