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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The theory of Evolution was produced by
Answer: D
Charles Darwin produced it.
On the Origin of Species appeared in 1859, proposing that species change through natural selection acting on inherited variation. Alfred Russel Wallace reached the same conclusion independently, which is what prompted Darwin to publish.
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By which country was Atomic bomb was first successfully developed
Answer: A
The United States developed it.
The Manhattan Project tested the first device at Alamogordo on 16 July 1945, and bombs were dropped on Hiroshima and Nagasaki the following month. The Soviet Union followed in 1949, Britain in 1952, France in 1960, China in 1964 and India in 1974.
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Which app to locate board examination centres for students was launched by which body?
Answer: A
It was launched by the CBSE.
The Central Board of Secondary Education released an app to let candidates find their examination centre by entering their roll number, showing the route and distance.
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Which item, originally called the Whirlwind, was invented by Ives McGaffey in 1869?
Answer: D
It was the vacuum cleaner.
Ives McGaffey patented his hand-cranked Whirlwind in 1869. It was hard to work - one hand turned the crank while the other pushed - and few were sold; the powered version came from Hubert Booth in 1901.
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Cinematography was invented by
Answer: B
Thomas Edison is credited with it.
His laboratory built the kinetograph camera and the kinetoscope viewer between 1889 and 1892, though W.K.L. Dickson did most of the work. The Lumiere brothers' cinematograph of 1895 first projected film to an audience.
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When was the Raggedy Ann doll patented?
Answer: A
The Raggedy Ann doll was patented in 1915.
Johnny Gruelle, a cartoonist, patented the rag doll with red yarn hair and named it after two poems by James Whitcomb Riley. The stories about her followed in 1918.
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Galileo was an Italian astronomer who
Answer: D
All of these.
Galileo found that a pendulum's period does not depend on the size of its swing; discovered the four large moons of Jupiter in 1610, which showed not everything orbits the earth; and improved the telescope to twenty times magnification for astronomical use.
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Which famous inventor ranks second in the number of patents registered?
Answer: A
Edwin Land ranks second.
The inventor of the Polaroid camera held 535 United States patents. Edison holds 1,093, the most of any individual American inventor.
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