Insulin was discovered by:
Answer: C
Frederick Banting discovered insulin.
With Charles Best at Toronto in 1921 he extracted it from dog pancreas and showed it controlled diabetes. He shared the 1923 Nobel Prize with J.J.R. Macleod and gave half his share to Best; the patent was sold to the university for one dollar.
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Who Invented Dynamite Explosive Material?
Answer: A
Alfred Nobel patented it.
Nitroglycerine was too unstable to handle safely; in 1867 he found that absorbing it in kieselguhr made it manageable, and patented the result as dynamite. The fortune it earned endowed the Nobel Prizes.
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Who Invented Contact Lens ?
Answer: C
Adolf Gaston Eugen Fick invented it.
The German ophthalmologist made the first contact lens in 1888, a heavy blown-glass shell that covered the whole eye and could be worn only for a few hours. Plastic corneal lenses came in the 1940s.
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Who invented the fountain pen?
Answer: B
Lewis E. Waterman invented it.
The insurance salesman patented a fountain pen with a capillary feed in 1884, which admitted air as ink flowed out and so prevented flooding.
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This African-American physical therapist worked with soldiers disabled in the Second World War and invented a device that fed a patient through a tube to a mouthpiece. Who was she?
Answer: A
She was Bessie Blount.
A physical therapist working with amputees after the Second World War, she invented a feeding device that delivered a mouthful of food through a tube at a bite. Unable to interest American authorities, she gave the patent to the French government in 1952.
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In which decade was the transistor invented?
Answer: A
It was invented in the 1940s.
John Bardeen and Walter Brattain made the point-contact transistor at Bell Labs in December 1947, and William Shockley followed with the junction transistor. The three shared the 1956 Nobel Prize in Physics.
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Who invented the first practical ballpoint pen ?
Answer: A
Correct answer: Laszlo Biro
The Hungarian journalist Laszlo Biro patented a workable ballpoint in 1938, having noticed that newspaper ink dried quickly and would not clog. His name is still the common word for the pen in Britain, India and much of the Commonwealth.
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Who invented the Seed Drill?
Answer: A
Jethro Tull invented the seed drill.
The English agriculturist built it in 1701. Sowing seed in straight rows at a set depth, instead of broadcasting it by hand, cut the quantity needed and raised yields sharply - one of the foundations of the agricultural revolution.
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Who invented the microwave oven?
Answer: A
Percy Spencer invented it.
An engineer at Raytheon, he noticed in 1945 that a chocolate bar in his pocket had melted while he stood near an active magnetron. He tried popcorn next, then an egg, which exploded. Raytheon sold the first Radarange in 1947.
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Which device determines an aircraft’s direction using the earth’s magnetic field and a rotating coil?
Answer: B
It is the earth inductor compass.
A coil rotated in the earth's magnetic field generates a current whose size depends on the aircraft's heading. Being electrical, it does not swing about in turns as a magnetic compass does; Charles Lindbergh used one across the Atlantic.
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