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Scientific Investigation

Scientific Investigation. According to the graph, which air pollutant decreased the most from 1970 to 1991?. Carbon monoxide Sulfur oxides Particulates Lead. B. A. C. D. Which of these experimental designs would best test this hypothesis?.

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Scientific Investigation

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  1. Scientific Investigation

  2. According to the graph, which air pollutant decreased the most from 1970 to 1991? • Carbon monoxide • Sulfur oxides • Particulates • Lead

  3. B. A. C. D. Which of these experimental designs would best test this hypothesis? Hypothesis: The addition of a fertilizer to soil will increase plant growth. • A • B • C • D

  4. Which animal has a life span closest to that of sheep? • Dog • Cat • Horse • Cow

  5. A. B. C. D. Which of these would be the best way to prove that a pine stick is more flexible than an oak stick? • A • B • C • D

  6. Each student in a science class of 25 conducts the same experiment. One student gathers all the data from herclassmates and summarizes the results of the experiment for the class. She compares the data she personally recorded with the class data. Which of these might indicate to her that her results are valid? • Three other classes performed the same experiment. • The same experiment was repeated two years in a row. • Many other students recorded data similar to hers. • Another student in her class reached a different conclusion.

  7. Thrips are tiny insects that can easily be seen on roses. The thrip population changes shown in the graph below are probably caused by — • increases in human population • a major climatic change • seasonal changes • increased use of insecticides

  8. A student designs and builds a 1:1000 scale model of the Mt. Fuji volcano in Japan. Since Mt. Fuji is about 3,800 m high, what is the height of his scale model? • 0.38 m • 3.8 m • 380 m • 3,800 m

  9. How far offshore is the deepest point ofthe ocean on this graph? • 0 m • 5000 m • 160 km • 240 km

  10. The diagram shows a graduated cylinder containing water. From which position will the most accurate measure of the volume of the water be made? • Position 1 • Position 2 • Position 3 • Position 4

  11. Which of the following is used tomeasure the mass of an object? • Balance • Metric ruler • Graduated cylinder • Barometer

  12. This chart represents the type and number of items collected in a beach cleanup. Based on the chart below, what percentage of the total items collected from the beaches was plastic? • 46% • 49% • 56% • 70%

  13. Some snapdragon seeds were studied in the experiment below. The seeds were placed in a dish lined with a moist paper towel. Which of these is the independent (manipulated) variable in this experiment? • The type of seed • The amount of water used • The number of sprouts • The temperature of each dish

  14. According to this graph, which of these is most important in developing the biomass of these plants? • Nitrates • Sulfates • Magnesium • Iron

  15. John and Emily were experimenting with the effects of road salt on plant growth. To do this, they watered plants daily with the same amount of salt water. They could best improve theirexperiment by — • increasing the amount of salt added to the water each day • cooling the salt water before watering the plants • adding food color to see how far the salt penetrates the plants • watering half the plants with pure water and half with salt water

  16. The picture shows dinosaur tracks found in rocks. How many dinosaurs left their tracks here? • 2 • 4 • 14 • 24

  17. What is the mass of the rock? • 335.6 g • 350.6 g • 354.6 g • 356.0 g

  18. The picture shows the results of putting a drop of orange ink from a marking pen on a piece of filter paper and allowing the colors in the ink to separate. About how much farther on the filter paper has the yellow pigmentmoved than the red pigment? • 0.5 cm • 1.6 cm • 2.7 cm • 3.5 cm

  19. The chart shows the results of an experiment to test the effects of different plant lights on plant seedling growth. Which group of plants showed the greatest gain in height? • Group 1 • Group 2 • Group 3 • Group 4

  20. The picture represents five red blood cells seen through a microscope. The lines represent a scale also visible through the microscope. Each division on the scale represents one micrometer. Use the scale to estimate the diameter of the average red blood cell. • 4—5 micrometers • 7—8 micrometers • 10—11 micrometers • 12—13 micrometers

  21. Ellen noticed that she often sneezes when she visits her friend Robert, who has a cat and a parrot. Ellen wonders if she may have allergies to Robert’s pets and decides to conduct a scientific investigation. What should Ellen do next? • Ellen should tell Robert that she cannot visit him until he gives away his pets. • Ellen should visit Sue who has a horse, a dog, a goldfish, and a hamster. • Ellen should call her doctor and insist that she needs shots for allergies. • Ellen should visit a friend who has only cats and one who has only parrots.

  22. The picture shows a test for non-slip surfaces to be used on a ramp. Which of these must be done to provide more meaningful results? • Use the same shoe on each surface • Use boards of the same thickness • Use the same shoe size for each type of shoe • Use shoes with soles designed for sports

  23. According to the graph, which angle of release would cause the javelin to go the farthest? • 75° • 60° • 45° • 30°

  24. A. B. C. D. An experiment was set up to measure the distance a snail would travel in 5 minutes. Which of these rulers should be used to give the most precise measurement? • A • B • C • D

  25. In the scale model below, one centimeter is equal to one-half of a meter. The mailbox is 2 truck lengths away from the model truck. How far away is the mailbox from the truck on the real street? • 5 meters • 10 meters • 15 meters • 20 meters

  26. Which of the following does not usemetric units to measure the density of a solution? • 10.5 grams/milliliter • 1.56 pounds/fluid ounce • 1050 kilograms/cubic meter • 1.05 grams/cubic centimeter

  27. According to the scale shown below, what is the approximate length of the baby blue whale? • 2 meters • 4 meters • 6 meters • 10 meters

  28. A student wishes to test the hypothesis that adding antifreeze to water lowers the freezing point of the water. What would be the dependent (responding) variable? • Amount of water put into a container • Amount of antifreeze added to the water • Temperature at which the water/antifreeze mixture freezes • Type of thermometer used to measure the freezing point

  29. Students measured and recorded the density of 4 samples. Using the density column and the data table shown below, which of the samples will probably float on top of the oil? • Sample A • Sample B • Sample C • Sample D

  30. A student wishes to measure the massof an object. Which instrument wouldbe most useful? • Triple beam balance • Graduated cylinder • Metric ruler • Erlenmeyer flask

  31. The picture shows the growth curve of a bacterial population. According to this information, the bacterial population doubles every — • 3 minutes • 20 minutes • 30 minutes • 60 minutes

  32. A student wanted to test the hypothesis that adding antifreeze to water lowers the freezing point of water. The student found that pure water froze at 0°C, while the water/antifreeze mixture froze at 20°C. In order to confirm the results, the student should repeat the experiment using — • a container of a different size • a different amount of antifreeze • a different amount of water • exactly the same set-up as the first experiment

  33. This experiment was set up to test thehypothesis that plants grow faster in green light. What is the independent variable in this experiment? • Type of plant • Amount of water • Color of light • Size of pot

  34. A student predicts that more sugar willdissolve in warm water than in cold water. She puts some water in a container, adds sugar, and then stirs. The amount of undissolved sugar is then observed. When this student repeats the experiment to verify her prediction, the only thing that should change is the — • amount of water used • temperature of the water • amount of sugar used • amount of time stirring

  35. A student conducted an experiment on plant growth that required adding about one cupful of liquid fertilizer to several plants each week. In order to accurately measure the fertilizer givento each plant, the fertilizer volume should be measured in — • cubic meters • milliliters • cubic feet • kiloliters

  36. A new medication dissolves blood clots. However, if too much is used, excessive bleeding occurs. Which method should scientists use to determine the best dosage of this new medication? • Use people of many different ages as test subjects • Have the test subjects eat a wide variety of foods with the medication • Change the times the medication is given to determine if timing affects bleeding • Vary only the dosages of the medication while keeping everything else constant

  37. As a supplement to some diets, iron istaken in tablet form. The mass of ironin these tablets is often measured in — • milliliters • calories • centimeters • milligrams

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