Who discovered that the genetic molecule DNA can transition between stable 'A' and 'B' structural forms depending on relative humidity levels? MCQ with Answer and Explanation
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Question #1
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The invention of the common household cleaning appliance known as the electric vacuum cleaner layout was patented by whom?
Correct Answer: Option B
Explanation:
Booth invented the large motorized vacuum pump rig in 1901, and Spangler patented the portable fan-and-bag layout which Hoover later commercialized.
Booth invented the large motorized vacuum pump rig in 1901, and Spangler patented the portable fan-and-bag layout which Hoover later commercialized.
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 B
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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Who invented the first successful gas mask used widely in industrial safety and military applications?
Correct Answer: Option A
Explanation:
African-American inventor Garrett Morgan patented the safety hood/smoke protector device in 1914, which laid the foundation for modern gas masks.
African-American inventor Garrett Morgan patented the safety hood/smoke protector device in 1914, which laid the foundation for modern gas masks.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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