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Sonar: Quiz

  
  
  

Question 1: The acoustic frequencies used in sonar systems vary from very low (________) to extremely high (ultrasonic).
ElephantInfrasoundVolcanoMicrobarom

Question 2: Another use of passive sonar is to determine the target's ________.
OrbitForceCometTrajectory

Question 3: In World War II, the Americans used the term SONAR for their systems, coined as the equivalent of ________.
Ultra high frequencyX bandWeather radarRadar

Question 4: Active sonar works the same way as ________: a signal is emitted.
RadarWeather radarUltra high frequencyX band

Question 5: Its name is because it was designed for patrol divers (combat ________ or Clearance Divers) to look for limpet mines in low visibility water.
Scuba divingRebreatherFrogmanDiving hazards and precautions

Question 6: The speed is determined by the water's bulk modulus and mass ________.
DensityCopperGoldIron

Question 7: Canadian ________, while working for the Submarine Signal Company in Boston, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U.S.
Reginald FessendenGuglielmo MarconiLee De ForestRadio

Question 8: A ________ frequently uses these databases to identify classes of ships, actions (i.e.
Central processing unitPersonal computerComputerLinux

Question 9: What does the following picture show?

  Cabin display of a fish finder sonar
  A Humpback whale
  Cabin display of a fish finder sonar
  Scuba diver using INSS hand-held sonar

Question 10: Water ________ also affects sound propagation: higher pressure increases the sound speed, which causes the sound waves to refract away from the area of higher sound speed.
ForceTemperaturePressurePressure measurement
















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