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Inventions MCQs – Mock Test 174
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Free Laser MCQ App Download (iOS & Android): In which one of the following year the first laser was discovered?; MCQ with answers: 1940, 1950, 1960, and 1930. Practice inventions and inventors questions and answers, Apple Book to download free chapter to master technology history.
MCQ 866: In which one of the following year the first laser was discovered?
MCQ 867: In which one of the following year, internal combustion engine was discovered?
MCQ 868: Penicillin was discovered by:
MCQ 869: Patented food bar was designed to help burn fat by a pathologist in California named as:
MCQ 870: In which century, Pascaline calculator was patented?
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