Who discovered that stable elements possess unique integer identifiers based on X-ray emission frequencies, restructuring atomic numbers? MCQ with Answer and Explanation

Question

Who discovered that stable elements possess unique integer identifiers based on X-ray emission frequencies, restructuring atomic numbers?

A. Dmitri Mendeleev

B. Ernest Rutherford

C. Henry Moseley

D. J.J. Thomson

Answer: Option C

Solution (By JKSSB Mock Tests)

Moseley proved that ordering chemical elements by nuclear charge (atomic number) resolved inconsistencies in Mendeleev's mass-ordered layout.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the common electronic operating layout known as the Graphical User Interface (GUI) was pioneered by which lab?

A. Microsoft

B. IBM Research

C. Apple Computers

D. Xerox PARC

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Correct Answer: Option D

Explanation:
Xerox Palo Alto Research Center (PARC) engineered the Alto computer featuring mouse-driven windows, menus, and file icons.

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Question #2

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

A. Rosalind Franklin

B. Dorothy Hodgkin

C. Barbara McClintock

D. Marie Curie

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Correct Answer: Option A

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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Question #3

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Who discovered the planet Neptune using mathematical calculations before it was verified by telescope?

A. Johannes Kepler

B. Urbain Le Verrier and John Couch Adams

C. William Herschel

D. Galileo Galilei

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Correct Answer: Option B

Explanation:
Urbain Le Verrier and John Couch Adams independently calculated the location of Neptune based on irregularities in Uranus's orbit.

This question belongs to: Static General Knowledge Inventions and Discoveries

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