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- Question
In which decade were the first successful diode and triode vacuum tubes invented?
Options- A. 1800s
- B. 1880s
- C. 1890s
- D. 1900s
- Correct Answer
- 1900s
ExplanationIn 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. - 1. Who invented the phonograph?
Options- A. Thomas Edison
- B. John Kruesi
- C. Jules Levy
- D. Alexander Graham Bell Discuss
- 2. In which decade was the ARRL founded?
Options- A. 1940s
- B. 1930s
- C. 1920s
- D. 1910s Discuss
- 3. Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent?
Options- A. Banjo
- B. Oboe
- C. Clarinet
- D. Harmonium Discuss
- 4. Who among the following invented the small pox vaccine?
Options- A. Robert Koch
- B. Edward Jenner
- C. Robert Hooke
- D. Louis Pasteur Discuss
- 5. For what does the world owe Almon Strowger a debt of gratitude?
Options- A. Parking Meters
- B. Vending Machines
- C. Automatic Telephone Exchanges
- D. Traffic Lights Discuss
- 6. The ELECTRIC BATTERY, who's charged with inventing this one?
Options- A. Hertz
- B. Amper
- C. Galvani
- D. Volta Discuss
- 7. What George Pullman invented?
Options- A. Sleeping (railway) car
- B. Airship
- C. Box car (railway)
- D. Air brakes Discuss
- 8. What Henry Bessemer invented?
Options- A. Aluminum
- B. Electroplating
- C. Steel Converter
- D. Steel rolling mill Discuss
- 9. Who was the first person to patent the JET ENGINE?
Options- A. F. Whittle
- B. C. Lindbergh
- C. W. Histell
- D. B. Owings Discuss
- 10. CORN FLAKES - Who made them first?
Options- A. Nabisco
- B. Kellogg
- C. Quaker
- D. Archers Discuss
Inventions problems
Search Results
Correct Answer: John Kruesi
Explanation:
John Kruesi was a mechanic for Edison, and Kruesi built the phonograph. Edison designed it, and later improved the phonograph.
Correct Answer: 1910s
Explanation:
On April 6, 1914, Hiram Percy Maxim proposed the formation of the American Radio Relay League.
Correct Answer: Harmonium
Explanation:
Ben also holds a lot of firsts - first U.S. ambassador, first political cartoonist, first American philosopher, organized the first fire department, and on and on.
Correct Answer: Edward Jenner
Correct Answer: Automatic Telephone Exchanges
Explanation:
He was an undertaker, and legend has it, he developed the automatic switch in 1889, to stop competitors from getting his work!
Correct Answer: Volta
Explanation:
Italian, Alessandro Volta discovered the first practical battery in 1800. Life would be very different without batteries.
Correct Answer: Sleeping (railway) car
Explanation:
Invented in 1857.
Correct Answer: Steel Converter
Explanation:
Invented in 1856.
Correct Answer: F. Whittle
Explanation:
British inventor Frank Whittle was the first to patent his design for a jet engine in 1930. Although an engine designed by Dr. Hans Von Ohain was the first to fly in 1939. Whittle's jet engine first flew in 1941.
Correct Answer: Kellogg
Explanation:
Will Keith Kellogg discovered the corn flake, by mistake, in 1906. They were the result of an experiment which went wrong.
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