Who invented the slide rule, an analog computing tool used extensively before electronic calculators? MCQ with Answer and Explanation

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Who invented the slide rule, an analog computing tool used extensively before electronic calculators?

A. William Oughtred

B. Gottfried Leibniz

C. Blaise Pascal

D. John Napier

Answer: Option A

Solution (By JKSSB Mock Tests)

William Oughtred invented the circular and rectilinear slide rule in the 1620s based on John Napier's logarithms.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The discovery of the cosmic rays was rewarded with a Nobel Prize to which physicist?

A. Arthur Compton

B. Robert Millikan

C. Carl Anderson

D. Victor Hess

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Correct Answer: Option D

Explanation:
Victor Hess discovered cosmic radiation by taking ionization monitoring instruments up in high-altitude balloon flights between 1911 and 1913.

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Question #2

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

A. Beno Gutenberg

B. Charles Richter

C. Inge Lehmann

D. Andrija Mohorovičić

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Correct Answer: Option C

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

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3

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Who discovered the composition of water as a compound of hydrogen and oxygen gases?

A. Robert Boyle

B. Joseph Priestley

C. Henry Cavendish and Antoine Lavoisier

D. John Dalton

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Correct Answer: Option C

Explanation:
Henry Cavendish observed that burning hydrogen produces water, and Antoine Lavoisier correctly identified it as a compound rather than a base element.

This question belongs to: Static General Knowledge Inventions and Discoveries

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