The invention of the common military defensive structure known as Barbed Wire was patented in its definitive commercial form by whom? MCQ with Answer and Explanation

Question

The invention of the common military defensive structure known as Barbed Wire was patented in its definitive commercial form by whom?

A. Joseph Glidden

B. Cyrus McCormick

C. John Deere

D. Eli Whitney

Answer: Option A

Solution (By JKSSB Mock Tests)

Joseph Glidden patented the two-wire twisted barb lock mechanism in 1874, changing open-range farming and livestock control.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common household cooking device known as the Microwave Oven was an accidental discovery by whom?

A. Thomas Edison

B. Robert Watson-Watt

C. Theodore Maiman

D. Percy Spencer

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Correct Answer: Option D

Explanation:
Spencer noticed a candy bar melted in his pocket in 1945 while standing near an active military radar magnetron vacuum tube.

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Question #2

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Who discovered the optical law of refraction independently, which relates the angles of incidence and refraction?

A. Isaac Newton

B. Christiaan Huygens

C. René Descartes

D. Willebrord Snellius

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Correct Answer: Option D

Explanation:
Willebrord Snellius formulated the law of refraction (Snell's Law) in 1621, determining refractive index constants.

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Question #3

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Who discovered that light waves shift in frequency relative to the relative motion between the source and observer?

A. Edwin Hubble

B. Christian Doppler

C. Heinrich Hertz

D. Albert Einstein

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Correct Answer: Option B

Explanation:
Christian Doppler proposed the Doppler Effect in 1842, which applies uniformly to both acoustic sound pitch adjustments and optical stellar shifts.

This question belongs to: Static General Knowledge Inventions and Discoveries

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