Practice Quiz

Praxis II Physics Content Knowledge Exam Prep - Question List

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21. A racecar travels at an average speed of 80 m/s in a race. The total distance of the race is 640,000 m.

How long does it take the racecar to finish the race?
  1. 800 s
  2. 8,000 s
  3. 6,400,000 s
  4. 51,200,000 s
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22. Which of the following statements best describes the force of Earth’s gravity on a rocket moving upward?
  1. The gravitational force is constant for all altitudes.
  2. The gravitational force is weaker when the rocket is higher.
  3. The gravitational force is stronger when the rocket is higher.
  4. The gravitational force is zero when the altitude is greater than 10,000 miles.
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23. 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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24. Which of the following observations is a result of the Doppler effect?
  1. Noise from across a lake is louder at night than during the day
  2. A person walking notices that the pitch of a car’s engine decreases as the car passes by.
  3. Beats are produced when two tuning forks with different frequencies are heard together.
  4. A person hears the sound from a radio more clearly in certain areas of a room than in others.
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25. Which of the following statements best explains why drops of liquid form on the outside of a glass of ice water on a hot day?
  1. Water molecules in the air are attracted to the surface of the glass.
  2. Water molecules in the ice water lose energy as they transfer heat to the air.
  3. Water molecules in the air lose energy as they transfer heat to the cold glass.
  4. Water molecules in the ice water move through the glass pores to the outside of the glass.
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