71. For what does the world owe Almon Strowger a debt of gratitude?
a.
b.
c.
d.

Option “C” is correct.
He was an undertaker, and legend has it, he developed the automatic switch in 1889, to stop competitors from getting his work.
72. In which decade was the telegraph invented?
a. 1810s
b. 1840s
c. 1870s
d. 1890s

Option “B” is correct.
The system was completed and public use initiated on May 24, 1844, with transmission of the message, “What hath God wrought!” This inaugurated the telegraph era in the United States, which was to last more than 100 years. Key-type Morse telegraph transmitter from the 1840s. Morse telegraph register from the 1840s.
73. What inspired reflecting road lights to be invented?
a.
b.
c.
d.

Option “B” is correct.
In 1933, Englishman Percy Shaw was driving home when he saw a cat’s eyes reflecting. He had been headed straight towards a fence with the cat on it, but on the other side was a drop of hundreds of feet.
74. When were blue jeans invented?
a. 1900s
b. 1860s
c. 1870s
d. 1850s

Option “C” is correct.
On May 20, 1873, San Francisco businessman Levi Strauss and Reno, Nevada, tailor Jacob Davis are given a patent to create work pants reinforced with metal rivets, marking the birth of one of the world’s most famous garments: blue jeans.
75. Who invented Electric Generator?
a.
b.
c.
d.

Option “B” is correct.
The first electromagnetic generator, the Faraday disk, was invented in 1831 by British scientist Michael Faraday. Generators provide nearly all of the power for electric power grids.
76. What Karl Benz invented?
a.
b.
c. Glider
d.

Option “A” is correct.
Karl Benz gets the credit for inventing the automobile because his car was practical, used a gasoline-powered internal-combustion engine and worked like modern cars do today.
77. When were bar code scanners invented?
a. 1940s
b.
c. 1970s
d. 1960s

Option “C” is correct.
The first scanning of the now-ubiquitous Universal Product Code (UPC) barcode was on a pack of Wrigley Company chewing gum in June 1974 at a Marsh supermarket in Troy, Ohio, using scanner produced by Photographic Sciences Corporation. QR codes, a specific type of 2D barcode, have recently become very popular.
78. When was the game Frisbee invented?
a. 1920s
b. 1900s
c. 1870s
d. 1950s

Option “C” is correct.
The first Frisbee were pie tins from the Frisbee Pie Company in Connecticut. In the 1950s, the pie tins were changed to plastic plates. The name then became the Flying Saucer, but later changed to Frisbee.
79. What piece of clothing was invented by French fashion designer Louis Reard in 1946?
a.
b.
c. Bikini
d.

Option “C” is correct.
The bikini, a two-piece swimsuit named for the Bikini Atoll in the Pacific, made its debut on July 5, 1946.
80.
In which year was MIDI introduced?
a. 1987
b. 1983
c. 1973
d. 1977

Option “B” is correct.
The MIDI specification was published in August 1983. The MIDI standard was unveiled by Kakehashi and Smith, who received Technical Grammy Awards in 2013 for their work. In 1982, the first instruments were released with MIDI, the Roland Jupiter-6 and the Prophet 600.
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