Practice Quiz

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

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36.
Astronomers use which of the following properties of stars to plot them on the Hertzsprung- Russell diagram?
  1. Proximity to Earth and age.
  2. Lifecycle stage and spectral class.
  3. Temperature and luminosity.
  4. Size and composition.
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37.
When a star such as the Sun reaches a late stage of its life, it typically becomes a:
  1. Neutron star comprising the nuclei of fused iron and carbon atoms.
  2. White dwarf comprising mainly carbon and oxygen.
  3. Black hole produced by compression of the extremely dense core.
  4. Cepheid variable star produced by instability in the star's dying core.
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38.
A main sequence star becomes a red giant when which of the following events occurs?
  1. The hydrogen in the star's core is used up.
  2. Expansion of the Core Causes It to Cool Down.
  3. The helium in the outer layers of the star begins to fuse.
  4. Combustion of gases on the star's surface causes it to expand.
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39.
An astronomer observes rapidly fluctuating radio signals from distant galaxies that occur as precisely spaced bursts of radiation. It is likely that the astronomer has located:
  1. An expanding planetary nebula.
  2. An oscillating black hole.
  3. A rotating neutron star.
  4. An eclipsing binary star system.
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40.
Which of the following best summarizes Newton's first law of motion as it relates to the Moon's orbit around Earth? 
  1. The Moon's inertia keeps it moving tangent to its orbit, while Earth's gravitational field deflects it from a straight path.
  2. The Moon's rotation keeps it on the same path, while its velocity is maintained by Earth's gravity.
  3. The Moon's acceleration is driven by its mass, while its circular motion is maintained by its gravitational attraction to Earth.
  4. The Moon's weight causes it to fall toward Earth, while centripetal force accelerates it away from Earth.
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