Practice Quiz

ACT Science Exam Prep - Question List

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31. What is the function of the myelin sheath that surrounds neurons?
  1. Increase speed of impulses
  2. Maintain polarization
  3. Decrease friction
  4. Control growth of neurons
  5. Oxygen exchange
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32. The half-life of 32 grams of a radioactive substance is 6.5 hours. How many grams of the substance remain after 19.5 hours?
  1. 16 grams
  2. 8 grams
  3. 4 grams
  4. 2 grams
  5. 32 grams
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33. What term classifies a phase change from a solid directly to a gas?
  1. Vaporization
  2. Deposition
  3. Effervesence
  4. Fusion
  5. Sublimation
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34. Which of the following is an example of a vector quantity?
  1. A student walks 2.0 km north.
  2. An object has a mass of 10.5 kg.
  3. A 1.0 kg object moves at 18 m/s.
  4. A ball has an instantaneous speed of 15 m/s.
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35. Radio waves, visible light, and x-rays are examples of electromagnetic waves that always differ from each other in:
  1. Amplitude
  2. Intensity
  3. Temperature
  4. Wavelength
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