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8th Grade Science Released Tests - Scientific Method
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8th Grade Science Released Tests - Scientific Method
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The best scientific reason for a scientist to accept a specific theory is —10001to obtain funding for the research001that research and observations support the theory11001because there can only be one correct theory001to gain recognition as a great scientist001A student predicts that similar ice cubes will melt faster in a microwave than in a pot on the stove. How should this hypothesis be tested?10001Measure and compare the volume of the pot and the microwave.001Determine the volume of liquid water made by each ice cube.001Observe and record the time for each ice cube to completely change to a liquid.11001Identify and record the temperature of each ice cube before each trial.001<img src="14-2.png" alt="14-2.png" title="14-2" width="283" height="74"></img></img>
Which of these experimental designs would best test this hypothesis?10001<img src="14a.png" alt="14a.png" title="14a" width="119" height="99"></img>001<img src="14b.png" alt="14b.png" title="14b" width="112" height="93"></img>001<img src="14c.png" alt="14c.png" title="14c" width="109" height="95"></img>11001<img src="14d.png" alt="14d.png" title="14d" width="121" height="98"></img>001(2003) 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?10001Ellen should tell Robert that she cannot visit him until he gives away his pets.001Ellen should visit Sue who has a horse, a dog, a goldfish, and a hamster.001Ellen should call her doctor and insist that she needs shots for allergies.001Ellen should visit a friend who has only cats and one who has only parrots.11001<img src="33-4.png" alt="33-4.png" title="33-4" width="359" height="81"></img><br />(2004)Some snapdragon seeds were studied in the experiment above. The seeds were placed in a dish lined with a moist paper towel. Which of these is the independent (manipulated) variable in this experiment?10001The type of seed001The amount of water used001The number of sprouts001The temperature of each dish11001(2004) 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 <em>best </em>improve their experiment by —10001increasing the amount of salt added to the water each day001cooling the salt water before watering the plants001adding food color to see how far the salt penetrates the plants001watering half the plants with pure water and half with salt water11001<img src="39.png" alt="39.png" title="39" width="278" height="104" style="float: right;"></img>(2003) 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?10001Use the same shoe on each surface11001Use boards of the same thickness001Use the same shoe size for each type of shoe11001Use shoes with soles designed for sports001<img src="13-4.png" alt="13-4.png" title="13-4" width="235" height="256" style="float: right;"></img>(2004)This experiment was set up to test the hypothesis that plants grow faster in green light. The same amount of water and fertilizer were added to each pot. Which of these would improve the experiment?10001Use green lights for all three plants001Add more types of plants001Use the same kind of plant in all trials11001Use different pots for each plant<br /><br />001<img src="47.png" alt="47.png" title="47" width="395" height="145"></img>
Students conducted an investigation to determine if unknown liquids were acids or bases. What was the independent variable in this investigation?10001Sample11001Indicator001Color change001Identification001A student suspects that there is a relationship between the amount of sunny weather in a given state and the amount of solar energy used by its inhabitants. In order to find out if this idea is correct, the student will need which information for each state?10001The efficiency of solar technology used in that state001The location and type of solar cells used in that state001The percentage of days that have enough sunlight to power a solar water heater001The number of sunny days per year and the amount of solar power used per year11001Which of these would be the best way to prove that a pine stick is more flexible than an oak stick?10001<img src="23a.png" alt="23a.png" title="23a" width="257" height="151"></img>001<img src="23b.png" alt="23b.png" title="23b" width="251" height="164"></img>001<img src="23c.png" alt="23c.png" title="23c" width="265" height="151"></img>001<img src="23d.png" alt="23d.png" title="23d" width="260" height="157"></img>11001(2004) At what speed would a car have to move in order to travel 20 kilometers in two hours?100015 km/hr00110 km/hr1100120 km/hr00140 km/hr001(2003) The picture above illustrates the habitat of a population of animals and its distance from the nearest water source. How far does an animal have to travel to obtain water?<img src="43-3.png" alt="43-3.png" title="43-3" width="268" height="107" style="float: right;"></img>100016 centimeters00112 meters00150 meters001300 meters11001(2004) Which of the following is used to measure the mass of an object?10001Balance11001Metric ruler001Graduated cylinder001Barometer001<img src="4-4.png" alt="4-4.png" title="4-4" width="328" height="277" style="float: right;"></img>(2004) The diagram shows a graduated cylinder containing water. From which position will the most accurate measure of the volume of the water be made?10001Position 1001Position 2001Position 311001Position 4<br /><br /><br />001<img src="1-3.png" alt="1-3.png" title="1-3" width="302" height="204" style="float: right;"></img>(2003) The picture shows dinosaur tracks found in rocks. How many dinosaurs left their tracks here?1000120014110011400124<br /><br /><br />001(2003) 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. <img src="21.png" alt="21.png" title="21" width="216" height="245" style="float: right;"></img>100014—5 micrometers0017—8 micrometers1100110—11 micrometers00112—13 micrometers<br /><br /><br />001Which is an SI metric unit of measurement that is used to record the heat transfer of a solution in a classroom investigation?10001Liter001Newton001Volt001Degree Celsius11001<img src="5.png" alt="5.png" title="5" width="439" height="140"></img>
A lab group measured how far two rubber bands stretched when attached to 100-gram masses. Five measurements were made for each rubber band. What is the range of the data collected for rubber band B?100010.3 cm110010.5 cm0012.7 cm0012.8 cm001Which instrument would most accurately and precisely determine the mass of a toy car?10001An electronic light meter001A spring scale001A triple-beam balance11001A graduated cylinder001The average distance from Earth to the Moon is 384,401 km. How is the distance from Earth to the Moon expressed in scientific notation?10001<img src="12a.png" alt="12a.png" title="12a" width="87" height="25"></img>001<img src="12b.png" alt="12b.png" title="12b" width="90" height="19"></img>001<img src="12c.png" alt="12c.png" title="12c" width="89" height="23"></img>11001<img src="12d.png" alt="12d.png" title="12d" width="89" height="25"></img>001<img src="40.png" alt="40.png" title="40" width="259" height="193" style="float: right;"></img>
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?100010.38 m0013.8 m11001380 m0013,800 m001
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