The first practical automatic dishwasher was invented and patented by which female innovator in 1886? MCQ with Answer and Explanation

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The first practical automatic dishwasher was invented and patented by which female innovator in 1886?

A. Grace Hopper

B. Stephanie Kwolek

C. Josephine Cochrane

D. Mary Anderson

Answer: Option C

Solution (By JKSSB Mock Tests)

Josephine Cochrane designed the first successful hand-powered mechanical dishwasher because she wanted to protect her fine china from chipping.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The electron was discovered in 1897 by which of the following physicists?

A. Ernest Rutherford

B. James Chadwick

C. J.J. Thomson

D. John Dalton

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Correct Answer: Option C

Explanation:
J.J. Thomson discovered the electron through his experiments with cathode ray tubes in 1897.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who invented the first operational hot air balloon, executing the first recorded human flight?

A. Otto Lilienthal

B. Wright Brothers

C. Count Ferdinand von Zeppelin

D. Montgolfier Brothers

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Correct Answer: Option D

Explanation:
Joseph-Michel and Jacques-Étienne Montgolfier developed and demonstrated the hot air balloon in France in 1783.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who discovered the precise genetic structure layout known as the operon model in bacterial gene regulation?

A. Barbara McClintock

B. James Watson and Francis Crick

C. Gregor Mendel

D. François Jacob and Jacques Monod

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Correct Answer: Option D

Explanation:
Jacob and Monod mapped the lac operon in E. coli, proving how cells inhibit or promote enzyme production based on nutrient environments.

This question belongs to: Static General Knowledge Inventions and Discoveries

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