51. What African-American inventor received 5 patents in the field of shoemaking?
a.
b.
c.
d.

Option “B” is correct.
Jan Ernst Matzeliger received 5 patents in the field of shoemaking.
52. It travels over land and water. Who invented the hovercraft?
a.
b.
c.
d.

Option “C” is correct.
Christopher Cockerell invented the hovercraft in 1956. His early experiments with the idea involved a cat food tin, a coffee tin and an industrial blower.
53. In which decade was the AEEE (now the IEEE) founded?
a. 1850s
b. 1880s
c. 1930s
d. 1950s

Option “B” is correct.
The IEEE (Institute of Electrical and Electronics Engineers) was formed in 1963 by the merger of the Institute of Radio Engineers (IRE, founded 1912) and the American Institute of Electrical Engineers (AIEE, founded 1884).
54.
What type of system did Paul Nipkow, John Baird, and Charles Jenkins all invent?
a. Telephone
b.
c. Electricity
d. Television

Option “D” is correct.
All of the inventors mentioned invented an early mechanical television system.
55. What Sir Isaac Newton invented?
a.
b. Chronometer
c. Microscope
d. Spectacles

Option “C” is correct.
Sir Isaac Newton invented Chronometer.
56. What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?
a.
b.
c.
d.

Option “A” is correct.
The Richter scale was developed in 1935 by American seismologist Charles Richter (1891-1989) as a way of quantifying the magnitude, or strength, of earthquakes.
57. What James Watt invented?
a.
b.
c.
d.

Option “D” is correct.
James Watt invented rotary steam engine.
58. Where is the village of Branston, after which the famous pickle is named?
a. Yorkshire
b. Lancashire
c. Staffordshire
d. Norfolk

Option “C” is correct.
The village of Branston is in Staffordshire, just south of Burton-on-Trent.
59. Who invented Jet Engine?
a.
b.
c.
d.

Option “A” is correct.
Dr. Hans von Ohain and Sir Frank Whittle are recognized as the co-inventors of the jet engine. Each was working separately and knew nothing of the others work. Although Whittle started first, von Ohain was first to design and develop a turbojet engine to power an aircraft.
Of the many honors received by both, the most significant honor was probably “The Charles Draper Prize” in 1992 which was given to both Hans von Ohain and Sir Frank Whittle for their efforts and contributions to aviation and mankind. “The Charles Draper Prize” is recognized as the equivalent to the Nobel Prize in technology.
60. What invention caused many deaths while testing it?
a. Dynamite
b. Ladders
c.
d. Parachute

Option “D” is correct.
Many people who tried to test the first parachutes died by jumping from high places. One attempt was a parachute hat, but the inventor broke his neck while testing it. The first successful parachute was tested from a hot air balloon in 1797, in France, by Jacques Garnerin.
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