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
When was barb wire patented?
  1. 1874
  2. 1840
  3. 1895
  4. 1900
When were bar code scanners invented?
  1. 1940s
  2. 1950s
  3. 1970s
  4. 1960s
Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?
  1. Golf tee
  2. Motorboat
  3. Water skis
  4. Hang glider
Who invented Bifocal Lens?
  1. Alfred B. Nobel
  2. Thomas Alva Edison
  3. Benjamin Franklin
  4. Rudolf Diesel
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