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Class 9 · Science
→If an experiment on the effect of fertilizer is conducted using only one plant what is the greatest limitation?
Class 9 · Science
→Four plants receive (50,mL), (100,mL), (150,mL) and (200,mL) of water respectively. How many levels of the independent variable are present?
Class 9 · Science
→A student investigates the effect of temperature on enzyme activity. What happens if a different amount of enzyme is used at each temperature?
Class 9 · Science
→What is a factor called when it can affect the result but is neither deliberately changed nor controlled in an experiment?
Class 9 · Science
→Wing length of a paper aeroplane is changed and flight distance is measured. Which factor is most appropriate to control?
Class 9 · Science
→In 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 9 · Science
→While measuring the distance travelled by a toy car on different surfaces what type of variable is the surface type?
Class 9 · Science
→In comparing the cleaning ability of three soaps a different type of stain was placed on each cloth. Why would the result be unreliable?
Class 9 · Science
→While investigating the effect of salt amount on the boiling point of water why is water without salt included?
Class 9 · Science
→A 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 9 · Science
→In an experiment the amount of water was changed and the number of leaves was measured. Which is the quantitative dependent variable?
Class 9 · Science
→A student measures the time period of pendulums of different lengths. What should be kept constant for a fair test?
Class 9 · Science
→If the effect of acid concentration on the reaction rate with a metal is being tested which pair is correct?
Class 9 · Science
→A student tests how fan speed affects the drying time of a wet cloth. What is the dependent variable?
Class 9 · Science
→In an experiment seed germination was measured at different temperatures but each group contained a different number of seeds. What problem will this cause?
Class 9 · Science
→Which factor is most important to keep controlled while testing the effect of water temperature on the rate of sugar dissolution?
Class 9 · Science
→While testing the effect of fertilizer amount on plant height what type of variable is plant height?
Class 9 · Science
→A 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 9 · Science
→An experiment produced different mean results for two groups but each group contained only two samples. What is the most scientific next step?
Class 9 · Science
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