World Wide Web was publicly introduced for first time in
Answer: B
It was introduced publicly in 1990.
Tim Berners-Lee wrote the first browser and server at CERN in late 1990, and the Web was opened outside CERN in 1991. CERN placed the technology in the public domain in 1993.
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First practical fluorescent lamp was invented in 1941 by
Answer: B
George Inman invented it.
He led the General Electric team that produced the first practical fluorescent lamp in 1938. A discharge through mercury vapour emits ultraviolet, which a phosphor coating converts to visible light - three times as efficient as a filament lamp.
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Which vehicle was invented about 3000 BCE?
Answer: D
It was the chariot.
The spoked-wheel chariot appeared on the Eurasian steppe about 2000 BC, and solid-wheeled carts a thousand years earlier. It transformed warfare, and remained the fastest thing on land for two thousand years.
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First car made with Teetor's cruise control method was the
Answer: B
It was the Chrysler Imperial.
Ralph Teetor, who was blind, devised cruise control after being irritated by his lawyer's uneven driving. It appeared on the 1958 Chrysler Imperial under the name Auto-Pilot.
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Which piece of clothing was invented by the French designer Louis Reard in 1946?
Answer: C
It was the bikini.
Louis Reard introduced it in Paris in July 1946 and named it after Bikini Atoll, where an atomic test had been conducted four days earlier - he expected the garment to make a comparable explosion.
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Who Invented Elevator Safety Brake ?
Answer: B
Elisha G. Otis invented it.
His device of 1852 used a wagon spring that engaged ratchets on the guide rails the moment rope tension was lost. He demonstrated it at the New York Crystal Palace in 1854 by having the rope cut while standing on the platform.
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The earliest version of the cathode ray tube, using a cold-cathode diode, was invented by which German physicist?
Answer: A
It was Ferdinand Braun.
He built the first cathode ray tube in 1897, using a cold cathode and a fluorescent screen - the Braun tube. Every television and oscilloscope before the flat panel descended from it. He shared the 1909 Nobel Prize with Marconi.
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Who invented the safety pin in 1849 ?
Answer: D
Correct answer: Walter Hunt
Walter Hunt patented the safety pin in 1849, reportedly designing it in a few hours to settle a debt, and sold the rights for four hundred dollars. Its coiled spring and guarded clasp are essentially unchanged today.
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The hovercraft travels over land and water. Who invented it?
Answer: D
Christopher Cockerell invented it.
The British engineer worked out in 1955 that a ring of air blown downward would trap a cushion beneath a craft, testing the idea with two tin cans and a hair dryer. The SR.N1 crossed the Channel in 1959.
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Nancy Johnson invented hand-cranked ice cream churn in
Answer: A
It was 1843.
Nancy Johnson patented the hand-cranked ice cream churn, in which a paddle inside a cylinder was turned by hand while the cylinder sat in a bucket of ice and salt. The design is still the basis of domestic ice cream makers.
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