Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820? MCQ with Answer and Explanation

Question

Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820?

A. Michael Faraday

B. Hans Christian Ørsted

C. André-Marie Ampère

D. James Clerk Maxwell

Answer: Option B

Solution (By JKSSB Mock Tests)

Hans Christian Ørsted discovered electromagnetism when he noticed an electric current deflected a magnetic compass needle.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who invented the first practical electronic digital computer with binary logic architecture, known as the Z3?

A. Tommy Flowers

B. John von Neumann

C. Alan Turing

D. Konrad Zuse

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Correct Answer: Option D

Explanation:
German engineer Konrad Zuse completed the Z3 in 1941, recognized as the world's first functional program-controlled Turing-complete computer.

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Question #2

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Who invented the first successful gas mask used widely in industrial safety and military applications?

A. Nikola Tesla

B. Thomas Edison

C. Garrett Morgan

D. Alexander Fleming

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Correct Answer: Option C

Explanation:
African-American inventor Garrett Morgan patented the safety hood/smoke protector device in 1914, which laid the foundation for modern gas masks.

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Question #3

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The invention of the common medical diagnostic technology known as Ultrasound imaging is based on whose discovery of high-frequency sound physics?

A. Wilhelm Röntgen

B. René Laennec

C. Lazzaro Spallanzani and Pierre Curie

D. Alexander Fleming

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Correct Answer: Option C

Explanation:
Spallanzani studied bat echolocation, and the Curie brothers discovered piezoelectric crystallization, enabling high-frequency echography transducers.

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