Practice Quiz

Praxis II General Science: Content Knowledge Exam Prep - Question List

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111.
Hydrologists are helping establish the variability of discharge on a particular river. They determine the average discharge of the river over the past 100 years using historical data. Which of the following is the best measure of the variability of this data set? 
  1. The median
  2. The standard deviation
  3. The mode
  4. The arithmetic mean
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112.
A researcher investigating the geologic history of a region collects data on the orientation of a limestone layer exposed along a highway. The convention for reporting the orientation of the limestone layer typically would include which of the following information?
  1. The meters below the land surface of different sections of the top of the exposed part of the limestone.
  2. The angle between an imaginary vertical line and the uppermost surface of the limestone.
  3. The degree measurements that show the strike and dip of the bedding plane of the limestone.
  4. The thickness of the limestone and how it has changed from its original horizontal position.
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113.
A hydrologist is collecting water samples to determine the dissolved oxygen content of a pond that has become choked with weeds. To most closely reflect the actual dissolved oxygen content of the pond water, which of the following methods should the hydrologist use to collect the water samples?
  1. The water should be collected from below the pond's surface in various locations, filling and then sealing the containers rapidly and recording the locations.
  2. The samples should be collected from the pond's surface near the outlet where the water is moving rapidly and few weeds are growing.
  3. The water should be collected from near the bottom, making sure to leave some air space in the container and including some of the organic matter found in the pond.
  4. The samples should be collected near the pond's inlet and should avoid including any organisms or debris that may be in the water.
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114.
A researcher is analyzing data collected for a study of climate change. Which of the following actions by the researcher would most strongly bias the analysis?
  1. Noting flaws in the research design that may have generated faulty data.
  2. Removing data that significantly differ from expected results.
  3. Altering the graphical presentation of the data set to make it more readable.
  4. Summarizing data collected on a daily basis into a weekly average.
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115.
A scientist is investigating the source of a petroleum contaminant in a high-yield drinking-water well. The well is deep and draws from a confined aquifer. Test wells drilled immediately to the north and to the east of the well are found to be contaminated. Test wells drilled to the south and west are not. The scientist concludes that the contaminant must be coming from the north and east. Which of the following factors would most reduce the validity of the scientist's conclusion?
  1. The contaminated test wells are on the up-gradient side of the drinking-water well where groundwater in the confined aquifer flows toward the well.
  2. The uncontaminated samples were collected when the pump for the drinking-water well was on, while the other samples were collected when it was off.
  3. The contaminated samples were collected on the same day by different people.
  4. The uncontaminated test wells were drilled to a depth that is above the confined aquifer supplying water to the drinking-water well.
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