Practice Quiz

MTEL Technology and Engineering - Question List

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51.
Which of the following best explains why electromagnetic waves, but not sound waves, can travel through interstellar space?
  1. Sound waves attenuate over distance more easily than electromagnetic waves.
  2. Sound waves require a gravitational force in order to propagate.
  3. Sound waves have a greater amplitude than electromagnetic waves.
  4. Sound waves are dependent on a carrying medium.
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52.
An optical cable has a critical angle of 40°. Which of the following best describes rays of light that strike the internal wall of the cable at angles closer than this to perpendicular?
  1. They are scattered.
  2. They are partially reflected.
  3. They are dispersed.
  4. They are totally reflected.
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53.
Which of the following is the best example of the Doppler effect?
  1. An ambulance's siren changes from high pitch to low pitch after passing an observer.
  2. An ambulance's siren changes from low pitch to high pitch after passing an observer.
  3. An ambulance's siren changes from high amplitude to low amplitude after passing an observer.
  4. An ambulance's siren changes from low amplitude to high amplitude after passing an observer.
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54.
The period of a wave is 30 seconds. What is its approximate frequency?
  1. 0.033 Hz
  2. 0.50 Hz
  3. 33 Hz
  4. 50 Hz
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55.
A sound wave having a frequency of 80 Hz interacts with a sound wave having a frequency of 90 Hz. The interaction will produce a beat frequency of:
  1. 0.9 Hz.
  2. 10 Hz.
  3. 85 Hz.
  4. 170 Hz.
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