Inventions Practice Test 73
WD-40 Quiz Questions and Answers PDF - 73
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The Quiz: WD-40 was patented by; "WD-40" App Download [Free] with answers: sir john fitch, sir nikolaus otto, sir norn larsen, and sir john barber for online certificate courses. Solve inventions and inventors questions and answers, Amazon eBook to download free sample for distance learning.
WD-40 Questions and Answers PDF Download: Quiz 73
WD-40 was patented by
- Sir Nikolaus Otto
- Sir John Fitch
- Sir John Barber
- Sir Norn Larsen
Electron tubes were invented by
- Sir Henry W. Seelay
- Sir Schuyler Skaats Wheeler
- Sir Samuel W. Francis
- Sir John Ambrose
The first Christmas lights were lit by the use of electricity in
- 1877
- 1882
- 1851
- 1862
In which one of the following dates World first practical helicopter took flight?
- 1888
- 1939
- 1760
- 1952
The first self-contained digital camera was invented in
- 1975
- 1989
- 1999
- 1956
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