Rocket Engine was invented by-
Answer: A
Robert H. Goddard invented it.
He launched the first liquid-fuelled rocket in 1926 and patented the multi-stage rocket and the gyroscopic steering that all launch vehicles use. NASA's Goddard Space Flight Center is named after him.
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In which decade were the first successful diode and triode vacuum tubes invented?
Answer: D
They were invented in the 1900s.
John Ambrose Fleming patented the diode valve in 1904 and Lee de Forest added a third electrode to make the triode in 1906. The triode could amplify, which made radio, long-distance telephony and eventually electronic computing possible.
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D.D.T. was invented by
Answer: D
Paul Muller discovered the insecticidal action of DDT.
The Swiss chemist found it in 1939. DDT saved millions of lives from typhus and malaria, and won him the Nobel Prize in 1948; Rachel Carson's Silent Spring later exposed its effect on birds, and it was banned for agricultural use.
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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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Who Discovered The Nucleus of a Cell?
Answer: C
Robert Brown discovered it.
The Scottish botanist described the nucleus in orchid cells in 1831 and gave it that name. He is also remembered for Brownian motion, the random jitter of pollen grains in water that Einstein later explained.
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Electrons were discovered by
Answer: A
J.J. Thomson discovered the electron.
He showed in 1897 that cathode rays are particles far lighter than any atom, and identical whatever gas or electrode was used - so they must be a constituent of all matter. He won the Nobel Prize in 1906.
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What did Napier invent?
Answer: C
Napier invented logarithms.
John Napier published his tables in 1614, turning multiplication into addition and so transforming astronomical and navigational calculation. Laplace said they doubled the life of an astronomer. He also invented Napier's bones, an early calculating aid.
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In which decade was the first solid state integrated circuit demonstrated?
Answer: A
It was demonstrated in the 1950s.
Jack Kilby at Texas Instruments built the first working integrated circuit in September 1958, on a sliver of germanium. Robert Noyce at Fairchild produced a silicon version months later, and it was his planar design that the industry adopted.
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Nuclear power was used for first time to produce electricity in
Answer: D
It was 1951.
Experimental Breeder Reactor I in Idaho lit four light bulbs on 20 December 1951 - the first electricity generated from nuclear energy. The first station to supply a grid was Obninsk in the Soviet Union in 1954.
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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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