The invention of the common electronic LED (Light Emitting Diode) operating in the visible light spectrum was developed by whom? MCQ with Answer and Explanation
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Question #1
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Who discovered the antibiotic Streptomycin, the first effective cure for tuberculosis, winning a Nobel Prize in 1952?
Correct Answer: Option C
Explanation:
Selman Waksman discovered several antibiotics produced by soil microbes, including streptomycin.
Selman Waksman discovered several antibiotics produced by soil microbes, including streptomycin.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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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 #3
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The first practical automatic dishwasher was invented and patented by which female innovator in 1886?
Correct Answer: Option C
Explanation:
Josephine Cochrane designed the first successful hand-powered mechanical dishwasher because she wanted to protect her fine china from chipping.
Josephine Cochrane designed the first successful hand-powered mechanical dishwasher because she wanted to protect her fine china from chipping.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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