Practice Quiz

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

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31.
Which of the following provides evidence that the universe is expanding?
  1. The changing distance between stars in the Milky Way.
  2. The calculated distance to the cosmic horizon.
  3. The shifting of the spectral lines of galaxies.
  4. The emptiness of most regions of space.
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32.
Which of the following supported the scientific conclusion that the universe began with an inflationary expansion?
  1. The proportion of the different elements found in asteroids.
  2. The motion of galaxies receding from Earth in all directions.
  3. The variation in the density of different regions of space.
  4. The release of energy observed in nuclear fusion reactions.
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33.
Which of the following provides evidence of the existence of dark matter in the universe?
  1. The redshift of distant galaxies.
  2. The high energy emitted by quasars.
  3. The rotational velocity of galaxies.
  4. The size of superclusters.
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34.
Astronomers have speculated about what creates different types of galaxies. The leading hypothesis is that the:
  1. Collision of disk-like, relatively small galaxies produces larger spiral and elliptical galaxies.
  2. Presence or absence of a black hole determines whether a galaxy will develop into an elliptical or spiral type of galaxy.
  3. Gravitational attraction of the matter in galaxies causes them to change type as they age.
  4. Abundance or scarcity of heavy elements determines whether elliptical or spiral galaxies will form from preexisting gas clouds.
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35.
Redshift for some galaxies is larger than for other galaxies in different parts of the universe. This difference shows that galaxies are:
  1. Concentrated in the region of space closest to Earth.
  2. Developing at different rates depending on how their mass is distributed.
  3. Clustered in different regions of space by their age.
  4. Receding from each other at different rates depending on how far away they are.
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