What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?
A. Charles Richter
B. Hiram Walker
C. Giuseppe Mercalli
D. Joshua Rumble
Answer: Option A
A. Charles Richter
B. Hiram Walker
C. Giuseppe Mercalli
D. Joshua Rumble
Answer: Option A
Who invented the ballpoint pen?
A. Biro Brothers
B. Waterman Brothers
C. Bicc Brothers
D. Write Brothers
In which decade was the first solid state integrated circuit demonstrated?
A. 1950s
B. 1960s
C. 1970s
D. 1980s
A. Pneumatic rubber tire
B. Automobile wheel rim
C. Rubber boot
D. Model airplanes
Which scientist discovered the radioactive element radium?
A. Isaac Newton
B. Albert Einstein
C. Benjamin Franklin
D. Marie Curie
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