Who invented the modern safety pin in 1849? MCQ with Answer and Explanation

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Who invented the modern safety pin in 1849?

A. Walter Hunt

B. Isaac Singer

C. Eli Whitney

D. Elias Howe

Answer: Option A

Solution (By JKSSB Mock Tests)

Walter Hunt invented the safety pin in 1849 and sold the patent rights for just 400 dollars to pay off a debt.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that certain elements always react in fixed small whole number proportions by weight, establishing the Law of Definite Proportions?

A. Antoine Lavoisier

B. Joseph Proust

C. John Dalton

D. Robert Boyle

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Correct Answer: Option B

Explanation:
French chemist Joseph Proust proved chemical compounds contain fixed constituent mass ratios, verifying early atomic tracking.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that biological chemical energy transfers are regulated by specific high-energy nucleotide molecules called ATP?

A. Eduard Buchner

B. Fritz Lipmann

C. Hans Krebs

D. Karl Lohmann

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Correct Answer: Option D

Explanation:
Karl Lohmann isolated Adenosine Triphosphate from muscle tissues in 1929, identifying it as the universal intracellular energy currency.

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Question #3

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The discovery of the charge-coupled device (CCD), which replaces film with digital sensor pixels in cameras, was made by whom?

A. Charles Kao

B. Willard Boyle and George E. Smith

C. Fujio Masuoka

D. Theodore Maiman

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Correct Answer: Option B

Explanation:
Boyle and Smith invented the CCD at Bell Labs in 1969, fundamentally altering digital imaging, which won them a 2009 Nobel Prize.

This question belongs to: Static General Knowledge Inventions and Discoveries

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