The chemical element Fluorine was first isolated after many hazardous attempts by which French chemist? MCQ with Answer and Explanation

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The chemical element Fluorine was first isolated after many hazardous attempts by which French chemist?

A. Marie Curie

B. Joseph Louis Gay-Lussac

C. Henri Moissan

D. Antoine Lavoisier

Answer: Option C

Solution (By JKSSB Mock Tests)

Henri Moissan successfully isolated the highly reactive element fluorine in 1886 using electrolysis, winning the 1906 Nobel Prize in Chemistry.

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The invention of the common medical diagnostic technology known as Ultrasound imaging is based on whose discovery of high-frequency sound physics?

A. Wilhelm Röntgen

B. Alexander Fleming

C. René Laennec

D. Lazzaro Spallanzani and Pierre Curie

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Correct Answer: Option D

Explanation:
Spallanzani studied bat echolocation, and the Curie brothers discovered piezoelectric crystallization, enabling high-frequency echography transducers.

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Question #2

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The first practical high-pressure steam engine was constructed by which mechanical pioneer?

A. Richard Trevithick

B. James Watt

C. George Stephenson

D. Thomas Newcomen

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Correct Answer: Option A

Explanation:
Richard Trevithick built high-pressure industrial engines capable of generating high power outputs from lightweight boilers.

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The invention of the common mechanical thermometer scale fixed at 0 for freezing and 100 for boiling water was done by whom?

A. Anders Celsius

B. Daniel Gabriel Fahrenheit

C. René Antoine Ferchault de Réaumur

D. Lord Kelvin

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Correct Answer: Option A

Explanation:
Swedish astronomer Anders Celsius proposed the centigrade temperature scale in 1742.

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