Who discovered the exact value of the Earth's circumference using simple trigonometry and shadow lengths during solar eclipses? MCQ with Answer and Explanation
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Question #1
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The invention of the highly efficient multi-plate safety storage match box strip containing antimony trisulfide was pioneered where?
Correct Answer: Option C
Explanation:
Swedish manufacturing optimization made safety matches affordable and standard globally during the 19th century.
Swedish manufacturing optimization made safety matches affordable and standard globally during the 19th century.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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Who discovered that electrical currents pass through vacuum cavities via discrete streams named 'Cathode Rays'?
Correct Answer: Option D
Explanation:
Plücker observed early glow phenomena, and Crookes engineered highly evacuated discharge tubes to isolate ray behaviors.
Plücker observed early glow phenomena, and Crookes engineered highly evacuated discharge tubes to isolate ray behaviors.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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The invention of the common household incandescent light bulb configuration featuring durable tungsten filaments was patented by whom?
Correct Answer: Option B
Explanation:
Coolidge developed ductile tungsten wire processing, and Langmuir filled bulbs with inert gas, extending operation life dramatically.
Coolidge developed ductile tungsten wire processing, and Langmuir filled bulbs with inert gas, extending operation life dramatically.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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