Who discovered the biological presence of blood platelets and their exact role in physical blood coagulation? MCQ with Answer and Explanation

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Who discovered the biological presence of blood platelets and their exact role in physical blood coagulation?

A. Giulio Bizzozero

B. Marcello Malpighi

C. William Harvey

D. Karl Landsteiner

Answer: Option A

Solution (By JKSSB Mock Tests)

Italian pathologist Bizzozero identified blood platelets ('piastrine') in 1882, describing how they aggregate to plug damaged blood vessels.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who formulated the quantum theory, establishing that energy is emitted in discrete packets called quanta?

A. Werner Heisenberg

B. Max Planck

C. Albert Einstein

D. Louis de Broglie

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Correct Answer: Option B

Explanation:
Max Planck introduced quantum theory in 1900, originating Planck's constant ($h$), and won the 1918 Nobel Prize.

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Question #2

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

A. Dmitri Mendeleev

B. Henry Moseley

C. J.J. Thomson

D. Ernest Rutherford

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Correct Answer: Option B

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

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Question #3

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The invention of the common mechanical device known as the modern coin-operated parking meter was patented by whom?

A. James Ritty

B. Carl Magee

C. Garrett Morgan

D. Walter Hunt

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Correct Answer: Option B

Explanation:
Carl Magee patented the 'Park-O-Meter' in Oklahoma City in 1935 to regulate downtown vehicle traffic turnover.

This question belongs to: Static General Knowledge Inventions and Discoveries

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