Q. Compass is invented by

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Q. Cotton gin was invented by Eli Whitney in

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Q. Screw was invented in 3rd century B.C by

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Q. The Earth's largest ice volume is present in

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Q. Electric motor was invented by

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Q. Michael Faraday invented electric motor in

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Q. Electronic instrument which is used to measure alkalinity or acidity of a liquid was invented by

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Q. Electronic instrument of a liquid was invented in

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Q. Eyeglasses are invented in

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Q. Fiber glass is invented by Russell Games Slayter in

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Q. First practical fluorescent lamp was invented by

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Q. Fluxgate magnetometer was invented in

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Q. Fluxgate Magnetometer was invented by

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Q. Frequency modulation radio 'FM' was invented by

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Q. The 'FM' radio was invented in

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Q. John Froelich invented first gasoline-powered tractor in

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Q. The first graphical user interface was popularized as

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Q. First graphical user interface was introduced in

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Q. Gun powder was invented in

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Q. Gun powder was invented in

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