Answer & Explanation Answer: Option C Explanation: The Electric Drill was the invention of Arthur James Arnot. On 20 August 1889 he patented his design while working for the Union Electric Company in Melbourne. His original design was meant primarily for drilling rock to find coal!
104. Who among the following invented the small pox vaccine?
Answer & Explanation Answer: Option B Explanation: No answer description available for this question. Let us discuss.
105. What George Westinghouse invented?
A.Light bulb B.Electric razor C.Refrigerator D.Railway air brakes
Answer & Explanation Answer: Option C Explanation: Invented in 1868.
106. Who is the only U.S. President to invent and patent something?
A.Abraham Lincoln B.Theodore Roosevelt C.Thomas Jefferson D.Rutherford B. Hayes
Answer & Explanation Answer: Option B Explanation: In 1849 Honest Abe invented a method to aid ships that got stuck on sandbars. He called it A Device for Buoying Vessels Over Shoals. It was never used.
107. What furniture item was invented by California furniture designer Charles Prior Hall in 1968?
A.Sofa bed B.Captain’s chair C.Waterbed D.Hammock
Answer & Explanation Answer: Option C Explanation: No answer description available for this question. Let us discuss.
108. The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?
A.Robert Oppenheimer B.James B. Conant C.Leslie R. Groves D.Vannevar Bush
Answer & Explanation Answer: Option D Explanation: Leslie R. Groves, however, was the military head of the project and the overall supremo, while Robert Oppenheimer was the scientific director. The world’s first atomic bomb was exploded in the New Mexico desert on July 16, 1945.
109. When was the first lawn mower invented?
A.1830 B.1854 C.1835 D.1849
Answer & Explanation Answer: Option C Explanation: The first lawn mowers were not engine powered. Invented in 1830 by Edwin Budding of England, the mowers were turning blades on wooden sticks used to cut grass. Engine powered mowers were not invented until 1919 by an American Army colonel, who used the motor from a washing machine.
110. In which decade were the first successful diode and triode vacuum tubes invented?
A.1800s B.1880s C.1890s D.1900s
Answer & Explanation Answer: Option C Explanation: In 1904, John Ambrose Fleming invented the first practical electron tube called the ‘Fleming Valve’, which is a diode rectifier. In 1906, Lee de Forest invented the audion later called the triode, which provided signal amplification.
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These questions are useful for any competitive exam like IAS, Bank PO, SSC CGL, RAS, CDS, UPSC exams, and all state-related exams. You can attempt them for fun too.