Class VIII

What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?
  1. Charles Richter
  2. Hiram Walker
  3. Giuseppe Mercalli
  4. Joshua Rumble
What Benjamin Franklin invented?
  1. Bifocal spectacles
  2. Radio
  3. Barometer
  4. Hygrometer
Microphone is used to convert
  1. sound waves into electrical energy
  2. . sound waves into light rays
  3. electrical energy into sound waves
  4. D. sound waves into magnetic currents
What invention was first installed at a Hartford, Connecticut bank in 1889?
  1. Automatic teller machine
  2. Time-lock safe
  3. Burglar alarm
  4. Pay telephone
What Igor Sikorsky invented?
  1. Hydroplane
  2. Jet engine airplane
  3. Helicopter
  4. Glider
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