Who discovered that elements display periodic physical attributes when arranged strictly by atomic weight values? MCQ with Answer and Explanation

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Who discovered that elements display periodic physical attributes when arranged strictly by atomic weight values?

A. Dmitri Mendeleev and Julius Lothar Meyer

B. Henry Moseley

C. Antoine Lavoisier

D. John Dalton

Answer: Option A

Solution (By JKSSB Mock Tests)

Mendeleev and Meyer independently formulated structural periodic tables, but Mendeleev gained fame by accurately predicting undiscovered elements.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared?

A. William Herschel

B. Johann Wilhelm Ritter

C. Wilhelm Röntgen

D. Heinrich Hertz

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Correct Answer: Option B

Explanation:
Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who is credited with inventing the modern ballpoint pen in 1938?

A. Rowland Hill

B. John Loud

C. Lewis Waterman

D. László Bíró

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Correct Answer: Option D

Explanation:
Hungarian journalist László Bíró invented the first commercially successful ballpoint pen, which bears his name ('Biro') in many countries.

This question belongs to: Static General Knowledge Inventions and Discoveries