First automobile powered by an internal combustion engine that is fuelled by hydrogen is invented in
Answer: A
It was 1807.
Francois Isaac de Rivaz of Switzerland built a vehicle driven by an internal combustion engine burning a mixture of hydrogen and oxygen, ignited by an electric spark - the first internal combustion vehicle of any kind.
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Who invented the microphone?
Answer: B
Alexander Graham Bell is credited with it.
His liquid transmitter of 1876 varied the resistance of a circuit with the sound waves striking a diaphragm. Emile Berliner and David Hughes developed the carbon microphone soon afterwards, and Edison improved it for telephone use.
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When were the first rockets launched?
Answer: B
They were launched in the 13th century.
Chinese armies used gunpowder rockets as fire arrows against the Mongols at the siege of Kaifeng in 1232. The technology spread west with the Mongol conquests and reached Europe within a few decades.
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World's first mechanical air conditioner was invented and manufacture by
Answer: D
Willis Carrier invented it.
His machine of 1902 was designed to control humidity at a Brooklyn printing works, where damp paper was spoiling colour registration; cooling the air to condense moisture was the means. Comfort cooling came later.
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Inventor who invented vulcanized rubber that is made by mixing latex with sulphur and is then heated is
Answer: A
Charles Goodyear invented it.
He found in 1839 that rubber heated with sulphur stayed elastic in heat and cold alike, instead of melting in summer and cracking in winter. The process is named after Vulcan, the god of fire.
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Who invented the diesel engine?
Answer: D
Rudolf Diesel invented it.
He patented the compression-ignition engine in 1892 and had a working model by 1897. Compressing air alone to a high ratio raises its temperature enough to ignite injected fuel, so no spark is needed - which is why it is more efficient than a petrol engine.
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Who first designed and demonstrated the ARPANET, the forerunner of the internet?
Answer: C
Leonard Kleinrock.
He developed the queueing theory behind packet switching and supervised the first ARPANET node at UCLA, from which the first message was sent on 29 October 1969.
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Who invented Ethernet?
Answer: C
Both Robert Metcalfe and David Boggs.
They designed Ethernet at Xerox PARC in 1973, borrowing the idea of listening before transmitting from the ALOHAnet radio network in Hawaii. Metcalfe named it after the luminiferous ether once thought to carry light.
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First graphical user interface used commercially after its introduction was popularized as
Answer: D
Both the Xerox Star and the Apple Lisa.
The Star of 1981 was the first commercial computer with a graphical interface, windows, icons and a mouse, and the Lisa of 1983 brought the idea to a wider market. Both drew on research at Xerox PARC in the 1970s.
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Airplane was invented by
Answer: A
The Wright brothers invented it.
They flew at Kitty Hawk on 17 December 1903. What set them apart was three-axis control - wing-warping for roll, a movable rudder for yaw and an elevator for pitch - which they worked out with a wind tunnel of their own making.
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