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- Question
In which decade was the ARRL founded?
Options- A. 1940s
- B. 1930s
- C. 1920s
- D. 1910s
- Correct Answer
- 1910s
ExplanationOn April 6, 1914, Hiram Percy Maxim proposed the formation of the American Radio Relay League. - 1. 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
- 2. Who among the following invented the small pox vaccine?
Options- A. Robert Koch
- B. Edward Jenner
- C. Robert Hooke
- D. Louis Pasteur Discuss
- 3. 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
- 4. What toy was invented by Joshua Lionel Cowen around 1900?
Options- A. Raggedy Ann doll
- B. Yo-yo
- C. Electric train
- D. Tinkertoys Discuss
- 5. What Igor Sikorsky invented?
Options- A. Hydroplane
- B. Jet engine airplane
- C. Helicopter
- D. Glider Discuss
- 6. Who invented the phonograph?
Options- A. Thomas Edison
- B. John Kruesi
- C. Jules Levy
- D. Alexander Graham Bell Discuss
- 7. In which decade were the first successful diode and triode vacuum tubes invented?
Options- A. 1800s
- B. 1880s
- C. 1890s
- D. 1900s Discuss
- 8. The ELECTRIC BATTERY, who's charged with inventing this one?
Options- A. Hertz
- B. Amper
- C. Galvani
- D. Volta Discuss
- 9. What George Pullman invented?
Options- A. Sleeping (railway) car
- B. Airship
- C. Box car (railway)
- D. Air brakes Discuss
- 10. What Henry Bessemer invented?
Options- A. Aluminum
- B. Electroplating
- C. Steel Converter
- D. Steel rolling mill Discuss
Inventions problems
Search Results
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: Electric train
Explanation:
His middle name, Lionel, is the source of the Lionel Train brand name.
Correct Answer: Helicopter
Explanation:
Invented in 1939.
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: 1900s
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.
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.
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