# Harper Experimental Design 7th Grade: Question Preview (ID: 30339)

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 A student wanted to measure the temperature of boiling water. What tool? a) thermometer b) stop watch c) beaker d) flask A student wanted to heat 200 ml of water. What tool would be best? a) graduated cylinder b) microscope c) thermometer d) beaker Students need to measure the rate at which water flows through different soil types. The students have a graduated cylinder. Which other tool will best help students perform this investigation? a) stopwatch b) meter stick c) thermometer d) measuring cup Students wanted to measure the volume of a small screw. What tool would be best? a) ruler b) beaker c) graduated cylinder d) balance A student wanted to measure the volume of a box. What tool would be best? a) ruler b) graduated cylinder c) balance d) scale An engineer builds a new machine that cuts glass. The machine holds a sharpened mineral that is used to cut the glass. Which test will best determine if the new machine works? a) test the machine at different speeds b) test the machine using different people c) test the machine at different times of the dat d) test the machine using different thicknesses of glass Students timed how long it took a beetle to travel across surfaces covered with different materials. All the surfaces were the same length. They calculated the average speed of the beetle and recorded the results. What is the independent variable? a) speed of the beetle b) length of each surface c) material that covered each surface d) time the beetle spent traveling across each surface What type of graph is best to use if showing a comparison of data? a) circle graph b) bar graph c) line graph d) A student hypothesized that a mouse would learn to run through a maze faster if food was at the end of the maze. Which tool will best help the student determine if the speed of the mouse improved? a) metric ruler b) pan balance c) stopwatch d) spring scale WHich tool would be best to measure the MASS of an object? a) scale b) hand lens c) balance d) graduated cylinder Which of these is the best example of a product that results from adaptive engineering? a) a farm tool with a curved blade b) a water sprinkler activated by a timer c) a system for planting different crops each year d) a genetically modified plant species that resists pests A light bulb manufacturer plans to introduce a new type of energy efficient bulb. Which comparison is most helpful in determining if the new bulb meets the goal of decreased energy usage? a) the brightness of the bulb b) the spectrum of light produced by each bulb c) the average number of hours the bulbs stay lit d) the amount of electricity consumed to light each bulb Students want to test weed control cloth on their garden and section their garden into 4 parts; each gets a different weed cloth. 10 peppers were planted in each section, and all other growing conditions remained the same. What is the dep. variable a) number of weeds in each section at the end of the investigation b) health of the pepper plants at the end of the investigation c) the type of soil in the garden sections d) type of weed control cloth After an experiment has been completed, which should be done next? a) repeat the experiment b) throw the experiment out c) send your data to the US president d) Students want to test weed control cloth on their garden and section their garden into 4 parts; each gets a different weed cloth. 10 peppers were planted in each section, and all other growing conditions remained the same. What is the ind. variable a) number of weeds in each section at the end of the investigation b) the health of the pepper plants at the end of the investigation c) the type of soil in the garden sections d) the type of weed control cloth All good fair experiments should have a) a control group b) an experimental group c) 1 independent variable d) all of these The experiments dependent variable is also described as a) the one thing changed and tested b) the variable used as a comparison c) the data that is measured during or after the experiment d) The independent variable can be described as a) the data you are measuring b) the part of the experiment used as a comparison c) the one thing that is tested d) something that remains constant throughout the experiment When doing scientific experiments, how many independent variables should the experiment have? a) 0 b) 1 c) 2 d) 3
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