The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom? MCQ with Answer and Explanation

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The invention of the common mechanical pencil sharpener layout with internal planetary gears was patented by whom?

A. John Lee Love

B. Christopher Sholes

C. Nicolas Conté

D. Walter Hunt

Answer: Option A

Solution (By JKSSB Mock Tests)

African-American inventor John Lee Love patented the simple, functional portable mechanical sharpener layout ('Love Sharpener') in 1897.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered the specific mathematical formula detailing gas density variation relative to molecular weight, known as the diffusion law?

A. Thomas Graham

B. Amadeo Avogadro

C. John Dalton

D. Robert Boyle

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Correct Answer: Option A

Explanation:
Graham's Law states that the rate of effusion or diffusion of a gas is inversely proportional to the square root of its molecular mass.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered that light rays produce specialized structural ring patterns when passing through convex lenses resting on flat glass sheets?

A. Isaac Newton

B. Christiaan Huygens

C. Robert Hooke

D. Thomas Young

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Correct Answer: Option A

Explanation:
Newton's Rings are an interference pattern caused by the reflection of light between two surfaces, which Newton documented in detail.

This question belongs to: Static General Knowledge Inventions and Discoveries