Who discovered that the chemical element Calcium is isolated via electrolysis of lime and mercuric oxide mixtures? MCQ with Answer and Explanation

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Who discovered that the chemical element Calcium is isolated via electrolysis of lime and mercuric oxide mixtures?

A. Joseph Black

B. Antoine Lavoisier

C. Humphry Davy

D. Jöns Jacob Berzelius

Answer: Option C

Solution (By JKSSB Mock Tests)

Sir Humphry Davy isolated elemental calcium metal in 1808 using a mercury-cell electrolysis setup.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who invented the high-pressure industrial chemical synthesis of ammonia from raw nitrogen and hydrogen gases?

A. Fritz Haber and Carl Bosch

B. Wilhelm Ostwald

C. Antoine Lavoisier

D. Dmitri Mendeleev

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Correct Answer: Option A

Explanation:
The Haber-Bosch process synthesized ammonia efficiently on an industrial scale, revolutionizing agricultural fertilizers.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that elements display unique crystalline patterns when rapidly frozen from molten metal matrices, founding physical Metallurgy?

A. Antoine Lavoisier

B. Henry Bessemer

C. Henry Clifton Sorby

D. Dmitri Mendeleev

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Correct Answer: Option C

Explanation:
Sorby applied microscopic analysis to polished iron and steel samples, establishing microstructure phase boundaries.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who invented the first mass-market portable music device, the Walkman, introduced by Sony in 1979?

A. Akio Morita

B. Nobutoshi Kihara

C. Steve Jobs

D. Masaru Ibuka

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Correct Answer: Option B

Explanation:
Audio engineer Nobutoshi Kihara designed the Walkman under the direction of Sony co-founder Akio Morita.

This question belongs to: Static General Knowledge Inventions and Discoveries

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