Who discovered the presence of the cosmic entity known as the black hole through mathematical solutions to General Relativity equations? MCQ with Answer and Explanation
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Question #1
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The invention of the safety razor with disposable stamped steel blades was introduced by whom?
Correct Answer: Option B
Explanation:
King Camp Gillette patented the safety razor system with cheap, replaceable double-edged blades in 1904.
King Camp Gillette patented the safety razor system with cheap, replaceable double-edged blades in 1904.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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The invention of the common computing peripheral device known as the inkjet print mechanism was developed by which companies?
Correct Answer: Option D
Explanation:
Independent thermal bubble tracking research by Canon and HP in the late 1970s led to modern consumer inkjet printing.
Independent thermal bubble tracking research by Canon and HP in the late 1970s led to modern consumer inkjet printing.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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Who discovered the law of conservation of mass in chemical reactions?
Correct Answer: Option A
Explanation:
Antoine Lavoisier formulated the Law of Conservation of Mass in 1789, proving that mass is neither created nor destroyed in chemical transformations.
Antoine Lavoisier formulated the Law of Conservation of Mass in 1789, proving that mass is neither created nor destroyed in chemical transformations.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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