General Knowledge MCQs – Practice Test 7 (Chapter 14)
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Free "Technology Inventions Learning" App Download (Android & iOS): Chester Floyd Carlson invented the photocopier in; MCQ with answers: 1938, 1936, 1932, and 1934. Learn Cell Biology Quiz Questions, download Google Book (Free Chapter) for digital knowledge growth.
MCQ 31: Chester Floyd Carlson invented the photocopier in
MCQ 32: First personal computer controlled with a keyboard was invented in
MCQ 33: First solar cell was invented by
MCQ 34: First headset was invented by Nathaniel Baldwin in
MCQ 35: The Earth inductor compass was designed in
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