Inventions Practice Test 29
Dewar Flask MCQ (Multiple Choice Questions) PDF - 29
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The MCQs: First thermos was patented by; "Dewar Flask" App Download (iOS & Android) with answers sir etienne montgolfier, sir james dewar, sir alfred nobel and sir henri giffard for school certificate. Practice inventions and inventors questions and answers, Google eBook to download free sample for online education.
Dewar Flask Questions and Answers PDF Download: Quiz 29
MCQ 141: The first thermos was patented by
- Sir James Dewar
- Sir Etienne Montgolfier
- Sir Alfred Nobel
- Sir Henri Giffard
MCQ 142: Which one of the following invents the traffic lights with three colors?
- Sir William Potts
- Dr Dennis Colonello
- Dr Larry wang
- Sir Norman Rolston
MCQ 143: In which one of the following country Silver photo was discovered?
- France
- Netherlands
- Australia
- America
MCQ 144: Which one of the following is an inventor of Ballpoint?
- Sir Laszlo Biro
- Sir John J. Loud
- Sir Michael Faraday
- both a and b
MCQ 145: The first laser was invented by an American engineer named as
- Sind ibn Ali
- Ibraim al Fazari
- Sir Theodore Maiman
- Sir Steven Sasson
Mock Tests: Inventions Course Prep
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