The invention of the mass spectrometer, used to separate isotopes and determine chemical composition, was developed by whom? MCQ with Answer and Explanation

Question

The invention of the mass spectrometer, used to separate isotopes and determine chemical composition, was developed by whom?

A. James Chadwick

B. Francis William Aston

C. Ernest Rutherford

D. J.J. Thomson

Answer: Option B

Solution (By JKSSB Mock Tests)

Francis William Aston built the first fully functional mass spectrograph in 1919 and discovered isotopes in non-radioactive elements.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The first practical steam-powered water pump, known as the 'Miner's Friend', was invented by whom in 1698?

A. Richard Trevithick

B. Thomas Newcomen

C. Thomas Savery

D. James Watt

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Correct Answer: Option C

Explanation:
Thomas Savery patented the first commercial steam-driven machine to pump water out of flooded mines.

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Question #2

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

A. James Watson and Francis Crick

B. Barbara McClintock

C. François Jacob and Jacques Monod

D. Gregor Mendel

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Correct Answer: Option C

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

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Question #3

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Who discovered the phenomenon of nuclear magnetic resonance (NMR), which forms the basis of modern MRI scanners?

A. Isidor Isaac Rabi

B. Felix Bloch

C. Peter Mansfield

D. Paul Lauterbur

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Correct Answer: Option A

Explanation:
Isidor Isaac Rabi discovered nuclear magnetic resonance in 1938, for which he was awarded the Nobel Prize in Physics in 1944.

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