The type of resistor whose electrical resistance falls as its temperature rises was invented by
Answer: A
Samuel Ruben invented it.
The thermistor's resistance falls sharply as it warms, which makes it a sensitive temperature sensor and a means of limiting the surge of current when equipment is switched on. Ruben also invented the mercury battery.
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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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Who invented silicones?
Answer: B
Professor F.S. Kipping invented them.
Frederic Stanley Kipping worked on organosilicon compounds from 1899 and coined the word silicone. He thought them of no practical use; they became the basis of sealants, lubricants and medical implants.
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Volleyball, now an Olympic sport, was invented in 1895 by
Answer: B
William G. Morgan invented it.
A YMCA physical director at Holyoke, Massachusetts, he devised it in 1895 as a gentler alternative to basketball for older members, and called it mintonette. It became an Olympic sport in 1964.
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Who invented the first liquid-fuelled rocket and is known as the father of modern rocketry?
Answer: A
It was Robert H. Goddard.
He launched the first liquid-fuelled rocket in March 1926 and held 214 patents. Ridiculed by the press in 1920 for suggesting a rocket could reach the moon, he was vindicated when Apollo 11 landed; the newspaper printed a correction the day after the launch.
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First mechanical calculator was built in 1642 by
Answer: B
Blaise Pascal built it.
He made the Pascaline in 1642 at nineteen to help his father, a tax official, with his accounts. It added and subtracted by geared wheels with automatic carry, and about twenty were made.
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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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Telegraph Code was invented by-
Answer: D
Samuel F.B. Morse invented it.
With Alfred Vail he devised the code of dots and dashes, giving the shortest signals to the commonest letters by counting the type in a printer's case - which is why E is a single dot.
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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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Name of first popular web browser is
Answer: D
It was Mosaic.
Released in 1993 by Marc Andreessen and Eric Bina at the University of Illinois, it displayed images alongside text in the same window and ran on ordinary personal computers. It was the browser that made the Web popular, and Netscape grew out of it.
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