What Karl Benz invented?
Answer: A
Karl Benz invented the petrol-powered automobile.
His Patent-Motorwagen of 1885, a three-wheeler with a single-cylinder four-stroke engine, was patented in January 1886 and is reckoned the first true motor car. His wife Bertha made the first long road journey in it in 1888.
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Who was the first American female to patent her invention, a method of weaving straw with silk?
Answer: D
Mary Kies was the first.
She received a United States patent in 1809 for a method of weaving straw with silk or thread, used in making bonnets. Napoleon's embargo had cut off European straw hats, so the technique found a ready market.
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What did cardiologist Dr. Paul Zoll invent in Massachusetts in 1952?
Answer: D
He invented the pacemaker.
Paul Zoll demonstrated in 1952 that a stopped heart could be restarted and kept beating by electrical impulses delivered through the chest wall. The implantable pacemaker followed at the end of that decade.
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World's first mechanical air conditioner was invented and manufacture by
Answer: D
Willis Carrier invented it.
His machine of 1902 was designed to control humidity at a Brooklyn printing works, where damp paper was spoiling colour registration; cooling the air to condense moisture was the means. Comfort cooling came later.
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Radioactivity was discovered by
Answer: A
Henri Becquerel discovered radioactivity.
In 1896 he found that uranium salts fogged a photographic plate wrapped in black paper, without any exposure to light, so the radiation came from the element itself. He shared the 1903 Nobel Prize with the Curies.
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Who is often called the 'first African-American' inventor?
Answer: C
It is Benjamin Banneker.
A free African-American of Maryland, he built a striking wooden clock in 1753 from his own calculations, compiled almanacs with astronomical tables, and helped survey the boundaries of the District of Columbia.
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Who invented the mercury thermometer?
Answer: C
Daniel Fahrenheit invented it.
He made the first mercury thermometer in 1714, mercury being better than alcohol because it expands evenly and does not boil until 357 °C. He devised his scale with the same instrument.
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Integrated circuit was created by two engineers working separately in
Answer: C
It was created in 1958-59.
Jack Kilby built the first working integrated circuit at Texas Instruments in September 1958, on germanium with wire connections. Robert Noyce at Fairchild produced a silicon version months later with the connections printed on - the design the industry adopted.
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Who first found a practical method of freezing food?
Answer: A
Clarence Birdseye found it.
Working as a fur trader in Labrador, he saw fish frozen instantly in the Arctic air keep their taste and texture on thawing. He worked out that slow freezing forms large ice crystals that rupture the cells, and patented quick freezing in 1927.
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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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