The first practical mechanical sewing machine was patented by whom in 1846? MCQ with Answer and Explanation

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The first practical mechanical sewing machine was patented by whom in 1846?

A. Isaac Singer

B. Walter Hunt

C. Eli Whitney

D. Elias Howe

Answer: Option D

Solution (By JKSSB Mock Tests)

Elias Howe patented the first practical lockstitch sewing machine in the United States in 1846.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

Who invented the first mass-produced synthetic plastic material, Bakelite, in 1907?

A. Leo Baekeland

B. John Wesley Hyatt

C. Wallace Carothers

D. Alexander Parkes

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Correct Answer: Option A

Explanation:
Belgian-American chemist Leo Baekeland invented Bakelite, the first fully synthetic plastic valued for its electrical non-conductivity.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

Who discovered that the Earth's core is divided into solid inner and liquid outer layers?

A. Charles Richter

B. Beno Gutenberg

C. Andrija Mohorovičić

D. Inge Lehmann

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Correct Answer: Option D

Explanation:
Danish seismologist Inge Lehmann discovered the Earth's solid inner core in 1936 by studying seismic wave travel paths.

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Question #3

The structure of DNA was discovered in 1953 by James Watson and Francis Crick with the crucial aid of data from whom?

A. Barbara McClintock

B. Rosalind Franklin

C. Marie Curie

D. Dorothy Hodgkin

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Correct Answer: Option B

Explanation:
Rosalind Franklin's X-ray diffraction images (particularly Photo 51) were key to identifying the double-helix structure of DNA.

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