Practice Quiz

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

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41.
Which of the following groups of substances makes up most of a comet's nucleus? 
  1. Soot particles, sodium, and complex hydrocarbons.
  2. Nickel, iron, and hydrogen compounds.
  3. Methane, carbon, and elemental oxygen.
  4. Ice, carbonaceous dust, and frozen gases.
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42.
Which of the following is a characteristic of Venus that distinguishes it from the other seven planets?
  1. The temperature extremes on Venus are the greatest in the solar system.
  2. Venus's orbital path is well outside of the plane of the ecliptic.
  3. Venus's axial rotation is opposite in direction to its orbital path.
  4. The crust of Venus is primarily composed of iron and nickel.
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43.
The Oort cloud is a region in space that scientists have determined is:
  1. The source of most comets.
  2. An area where new stars form.
  3. The location of the asteroid belt.
  4. An area where a supernova occurred.
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44.
Scientists believe that the asteroids of the asteroid belt formed when:
  1. Debris from outside the solar system was captured by the Sun's gravity.
  2. Fragments of planetesimals failed to coalesce into one or more planets.
  3. Several moons orbiting Jupiter were destroyed by meteor impacts.
  4. Dust and ice in the early solar system clumped together.
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45.
The energy output of the Sun is maintained by which of the following processes?
  1. The conversion of hydrogen into helium in the core.
  2. The combustion of gases drawn into the chromosphere.
  3. The explosion of volatile compounds in the corona.
  4. The breakdown of high-energy particles in the photosphere.
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