Inventions Practice Test 13
Letter Box Quiz Questions and Answers PDF - 13
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The Quiz: First letter-box was discovered by; "Letter Box" App Download (Free) with answers sir albert potts, sir jack kilby, sir hans von ohain and alexander fleming for online learning. Solve inventions and inventors questions and answers, Amazon eBook to download free sample for online learning.
Letter Box Questions and Answers PDF Download: Quiz 13
MCQ 61: The first letter-box was discovered by
- Sir Jack Kilby
- Sir Albert Potts
- Sir Hans von Ohain
- Alexander Fleming
MCQ 62: The Revolver was invented by
- Sir Samuel Colt
- Dr Raymond Lemieux
- Sir Robert Fulton
- Dr Dennis Colonello
MCQ 63: The ceiling fan was invented by an American electrical engineer named as
- Sir Nikola Tesla
- Sir Rudolf Diesel
- Sir Schuyler Skaats Wheeler
- Sir James Hillier
MCQ 64: Infomercial exercise was invented by a renowned inventor named as
- Sir Norman Rolston
- Sirr James Naismith
- Dr Dennis Colonello
- Sir Thomas L. Wilson
MCQ 65: Standard time was invented by
- Sir T.J Blachut
- Sir Cyril Duquet
- Sir Sanford Fleming
- Sir Reginald A. Fessenden
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