Copyright 2014 Edmentum - All rights reserved. Which two pieces of equipment should Josh use to carry out this step?

Transcription

1 Study Island Copyright 2014 Edmentum - All rights reserved. Generation Date: 04/03/2014 Generated By: Cheryl Shelton Title: Grade 7 Science Inquiry & Application 1. In Josh's experiment, one step of the procedure requires him to bring some water to a boil. Which two pieces of equipment should Josh use to carry out this step? A. a bunsen burner and a balance B. a magnet and a petri dish a hot plate and a beaker D. a magnifying glass and a test tube 2. A journalist on a news show states that most insect repellants can harm the nervous system of infants. Should you consider the journalist s statement to be a scientific fact? A. No, a journalist is not an expert on medical science. B. No, only statements made by scientists are scientific facts. Yes, it makes sense that insect repellants could harm babies. D. Yes, journalists always thoroughly research their reports. 3. Select the correct sequence of steps for lighting a Bunsen burner. A. C, D, A, B B. D, C, A, B C, D, B, A D. C, B, D, A A. Apply the spark above the barrel of the Bunsen burner. B. Open the gas adjustment at the base of the Bunsen burner. Connect the burner hose to the gas outlet. D. Open the gas valve on the gas outlet.

2 4. Henry is interested in studying the different techniques perching birds use to build their nests. What type of investigation would best help Henry learn more about this topic? A. make observations in nature B. discover a previously unknown perching bird species build a model of a nest D. perform a controlled experiment 5. Which of the following should be done when designing an experiment for a controlled scientific investigation? A. list the procedures B. plan the variables list the needed materials D. all of these 6. In science class, Harry and his classmates are performing a controlled scientific investigation. The teacher has already picked a topic and testable question for the class to study and has provided background research on the topic. Before performing the investigation, the students must first A. record data from the investigation in graphs and charts. B. form a hypothesis to predict the outcome of the investigation. communicate the results of the investigation with the teacher. D. analyze the data that results from the investigation. 7. Autism is a disability that results from a disorder in the central nervous system. It has been speculated that the increasing number of cases of autism in recent years is due to the increase in the number of vaccinations given to young children. What might be another possible explanation for this phenomenon? A. The increase in immunizations is the only possible cause for autism. B. The increase in autism is due to an increase in television viewing. There are now better diagnostic tests available for autism, which causes more cases to be identified. D. The increase in autism is due to the decline of public education.

3 8. For the past four years, Mr. Thompson has kept a pet boa constrictor in his science classroom. At the beginning of each year, his students measure the length of the snake and record the result. The table below shows the measurements for all four years. Year Length (cm) What is the growth pattern of the boa constrictor? A. It grows 7 centimeters each year. B. It doubles in size every year. The amount it grows changes every year. D. It grows 70 centimeters each year. 9. Sarika is planning an experiment about air resistance. She plans to drop various objects from a height of 20 feet and measure the time it takes for each object to reach the ground. Which of the following instruments should Sarika use to measure time in this experiment? A. the second hand of a clock B. a stopwatch a spring scale D. a barometer 10. Sachiko wants to measure the temperature of ice water in a beaker. The thermometer she will be using is at room temperature. After she places the thermometer in the beaker, what should she do to obtain the most accurate measurement? Take the reading on the thermometer immediately. A. Take the reading immediately after the mercury level in the thermometer becomes stable. B.

4 Wait five seconds, then take the reading on the thermometer. Wait until the water warms to room temperature, then take the reading on the thermometer. D. 11. Nick hypothesizes that wax has a higher melting point than chocolate. How can Nick test his hypothesis? A. Measure the volume and weight of samples of wax and chocolate and calculate their densities. Use Mohs Hardness Scale to test how easily wax and chocolate can be scratched. B. D. Heat equal masses of wax and chocolate and measure their temperatures when they start to melt. Heat samples of wax and chocolate and use a stopwatch to time how long it takes until they start to melt. 12. Hugo is testing the idea that moths are attracted to the heat of campfires. He watches a threefoot by three-foot area around an unlit camp fire for one hour and counts how many moths enter the area. He then lights the fire and counts how many moths enter the area for another hour. Hugo finds that 5 moths entered the area before the fire was lit, but 26 moths entered it after it was lit. He concludes that moths are attracted to the heat of fires. Which of these is an alternative explanation for Hugo's results? Moths are attracted to woolen clothing. A. Most moths only live one or two weeks. B. Moths are attracted to light. Some moths have markings that help them scare off predators. D. 13. Maria hypothesizes that the amount of light in an environment affects the growth of algae living in that environment.

5 Which of the following is the best type of investigation for Maria to perform in order to test her hypothesis? A. observe algae in nature B. build a computer model of algae growth conduct a controlled experiment D. collect and observe different specimens of algae 14. Jill hypothesizes that individual volcanoes produce igneous rocks with a certain chemical signature. She further hypothesizes that scientists could use an igneous rock's chemical signature to determine where the rock came from. What type of investigation should Jill perform to test her hypothesis? A. perform a controlled experiment on a volcano B. observe and describe a volcanic eruption model the formation of an igneous rock D. collect and test rock specimens 15. When operating a microscope, always put the object into focus using the power lens first. Then, if needed, switch to a power lens and adjust the focus using the fine focus knob. A. medium; lower B. medium; higher lowest; higher D. highest; lower 16. Diego hypothesizes that the Earth wobbles on its axis in a pattern that is repeated every 20,000 years. Which of the following ways would be the best way to test Diego's hypothesis? A. make a model B. make observations in nature conduct a controlled experiment D. observe the movement of other planets

6 17. A boy complains of stomach pain to his mother. Unable to resolve the issue herself, she takes the boy to the doctor. Which of the following might be a good hypothesis for the stomach pain? A. Any of these answer choices could be correct. B. The boy ate something that upset his stomach. The boy has an infection and needs antibiotics. D. The boy fell and hurt his stomach. 18. What type of instrument is pictured above? A. graduated cylinder B. stirring rod thermometer D. probe 19. Two scientists test soil fertility in a forest and a nearby field. Both scientists find that the soil fertility in the forest is higher than the soil fertility in the field. Scientist A says that the forest's soil fertility is higher because the forest has more vegetation that keeps the topsoil from eroding. Scientist B says that the forest's soil fertility is higher because the forest's soil has a high count of decomposing bacteria. Which of the scientists' conclusions is valid? A. Neither scientist's conclusion is valid because soil fertility is hard to test. B. Both scientists' conclusions could be valid. Only scientist B's is valid because bacteria increase soil fertility. D. Only scientist A's is valid because it is supported by evidence. 20. A company that makes toothpaste states that a recent scientific study shows that their toothpaste leaves the mouth five times cleaner than any other brand of toothpaste. Which of the following is a good question to ask about the company's statement? I. How did the study measure a mouth's cleanliness? II. Who conducted the study?

7 III. What colors of toothpastes did they use in the study? A. I only B. II and III only III only D. I and II only