Who invented the first operational stethoscope in 1816? MCQ with Answer and Explanation

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Who invented the first operational stethoscope in 1816?

A. René Laennec

B. Edward Jenner

C. Joseph Lister

D. Louis Pasteur

Answer: Option A

Solution (By JKSSB Mock Tests)

René Laennec invented the acoustic stethoscope because he felt uncomfortable placing his ear directly on female patients' chests.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The discovery of the restriction enzymes, which slice DNA at specific sequences, revolutionized genetic engineering under which scientist?

A. James Watson and Francis Crick

B. Paul Berg

C. Werner Arber, Hamilton Smith, and Daniel Nathans

D. Kary Mullis

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Correct Answer: Option C

Explanation:
These three scientists received the 1978 Nobel Prize for discovering restriction endonucleases and applying them to molecular genetics.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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The invention of the highly accurate atomic clock configuration using cesium resonance was completed by whom?

A. Albert Einstein

B. Lord Kelvin

C. Louis Essen and Jack Parry

D. Isidor Isaac Rabi

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Correct Answer: Option C

Explanation:
Essen and Parry constructed the first highly functional stable cesium atomic clock standard in 1955 at the National Physical Laboratory.

This question belongs to: Static General Knowledge Inventions and Discoveries