First solar cell was invented in 1883 by
Answer: D
Charles Fritts made it.
He built the first solar cell in 1883 by coating selenium with a very thin layer of gold. Its efficiency was under one per cent, but it showed that light could be converted directly into electricity without heat or moving parts.
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Who was awarded the Nobel Prize for the discovery of vitamin K?
Answer: B
Doisy and Dam.
Henrik Dam discovered vitamin K in 1929 while studying cholesterol in chickens, and Edward Doisy determined its chemical structure. They shared the Nobel Prize in Physiology or Medicine in 1943. The K is for Koagulation.
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The pneumatic tyre was invented by ________.
Answer: C
Correct answer: John Boyd Dunlop
The Scottish veterinary surgeon John Boyd Dunlop devised the first practical pneumatic tyre in 1888, for his son’s tricycle. Robert Thomson had patented the idea decades earlier, but it was Dunlop’s version that reached production.
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Who invented Dynamite?
Answer: D
Alfred Nobel invented dynamite.
Nitroglycerine was dangerously unstable; in 1867 he found that absorbing it in kieselguhr, a porous earth, made it safe to handle. The fortune it earned endowed the Nobel Prizes.
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William Harvey discovered the
Answer: C
He discovered the circulation of the blood.
William Harvey showed in De Motu Cordis (1628) that the heart pumps blood round a closed circuit rather than the liver making it afresh, arguing from the volume the heart moves in an hour, which no organ could produce.
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What office item was invented by Bette Nesmith Graham in 1951?
Answer: C
It was Liquid Paper.
Bette Nesmith Graham, a typist at a Dallas bank, mixed white tempera paint in a kitchen blender to cover her mistakes, and sold the correction fluid from her garage. She sold the company to Gillette in 1979 for $47.5 million.
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In which decade was the ARRL founded?
Answer: D
The ARRL was founded in the 1910s.
Hiram Percy Maxim founded the American Radio Relay League in 1914 to relay amateur messages beyond the range of a single station. It remains the largest organisation of radio amateurs in the world.
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The four blood groups were discovered by
Answer: B
Karl Landsteiner discovered them.
He found in 1901 that mixing blood from different people sometimes caused clumping, and identified the groups A, B and O; AB was added by his students two years later. The discovery made transfusion safe and won him the Nobel Prize in 1930.
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First lock-stitch sewing machine was invented in 1833 by
Answer: D
Walter Hunt built it.
He made a lock-stitch machine about 1833 but did not patent it, fearing it would put seamstresses out of work. Elias Howe patented the principle in 1846, and Hunt's earlier work later cost him his claim.
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Elias Howe invented the
Answer: A
Elias Howe invented the sewing machine.
He patented the lockstitch machine in 1846, with the eye of the needle at its point and a shuttle carrying a second thread beneath. Isaac Singer built a more usable machine and was successfully sued by Howe for infringement.
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