Who invented the gramophone?
Answer: A
Thomas Alva Edison is credited with it.
He invented the phonograph in 1877, recording on tinfoil around a cylinder. Emile Berliner's gramophone of 1887 used a flat disc instead, which could be stamped in quantity and so became the standard.
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Railroad locomotive was invented in
Answer: C
It was invented in 1825.
George Stephenson's Locomotion No. 1 hauled the first train on the Stockton and Darlington Railway on 27 September 1825, the first public railway worked by steam. Richard Trevithick had run a locomotive on rails in 1804.
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Dr. Robert H. Goddard invented first liquid-fueled rocket in
Answer: A
It was 16 March 1926.
Robert Goddard launched a rocket burning petrol and liquid oxygen from his aunt's farm at Auburn, Massachusetts. It rose 12.5 m and flew for 2.5 seconds, but it proved that liquid-fuel rocketry worked.
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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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Playing cards were invented in the ninth century in
Answer: A
They were invented in Tang dynasty China.
The earliest reference is to a princess of the Tang court playing a leaf game in 868. Cards reached Europe by the 1370s, probably through Egypt, and acquired their present suits in France about 1480.
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Transistors that are used in every electronic product of modern era was invented by
Answer: B
John Bardeen and Walter Brattain built it.
They demonstrated the point-contact transistor at Bell Labs in December 1947. William Shockley, who led the group, went on to invent the junction transistor, and the three shared the Nobel Prize in 1956.
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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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In what year was the ball bearing patented?
Answer: A
It was patented in 1794.
Philip Vaughan, a Welsh ironmaster, patented a design in which balls ran in a grooved track on a carriage axle - the first radial ball bearing. Leonardo had sketched the idea three centuries earlier.
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Name of first personal computer controlled with a keyboard is
Answer: C
It was the IBM 610.
Introduced in 1957 and called the Auto-Point Computer, it was the first computer meant to be operated by one person at a keyboard rather than by a team feeding cards. About 180 were sold, at $55,000 each.
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Railroad locomotive was invented by
Answer: A
George Stephenson invented it.
He built Locomotion No. 1 for the Stockton and Darlington in 1825 and the Rocket, which won the Rainhill trials in 1829 with its multi-tubular boiler and blast pipe - the pattern of every steam locomotive after it. Richard Trevithick had built the first rail locomotive in 1804.
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