The invention of the standard mechanical typewriter carbon paper mechanism to replicate text was patented by whom? MCQ with Answer and Explanation
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Question #1
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The invention of the common matchstick containing phosphorus triggered by friction was developed by whom?
Correct Answer: Option A
Explanation:
English chemist John Walker invented the first friction match in 1826 by coating cardboard or wooden splints with sulfide pastes.
English chemist John Walker invented the first friction match in 1826 by coating cardboard or wooden splints with sulfide pastes.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom?
Correct Answer: Option A
Explanation:
African-American inventor John Lee Love patented the simple, functional portable mechanical sharpener layout ('Love Sharpener') in 1897.
African-American inventor John Lee Love patented the simple, functional portable mechanical sharpener layout ('Love Sharpener') in 1897.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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Who discovered that light waves can be deflected and focused by intense gravitational fields, a phenomenon known as gravitational lensing?
Correct Answer: Option B
Explanation:
Albert Einstein predicted gravitational lensing under his General Theory of Relativity, which was later observed observationally.
Albert Einstein predicted gravitational lensing under his General Theory of Relativity, which was later observed observationally.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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