Who discovered the first biological enzyme, Diastase, which breaks down starches into sugars? MCQ with Answer and Explanation

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Who discovered the first biological enzyme, Diastase, which breaks down starches into sugars?

A. Alexander Fleming

B. Hans Krebs

C. Louis Pasteur

D. Anselme Payen

Answer: Option D

Solution (By JKSSB Mock Tests)

French chemist Anselme Payen isolated diastase from barley malt in 1833, founding the scientific study of enzymes.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common mechanical device known as the industrial centrifugal cream separator was patented by whom?

A. James Watt

B. Eli Whitney

C. Gustaf de Laval

D. Cyrus McCormick

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Correct Answer: Option C

Explanation:
De Laval patented the high-speed continuous centrifugal cream separator in 1878, streamlining commercial dairy production.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered the mathematical value and formula for the Universal Gravitational Constant ($G$) using a torsion balance?

A. Robert Hooke

B. Albert Einstein

C. Isaac Newton

D. Henry Cavendish

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Correct Answer: Option D

Explanation:
Henry Cavendish measured the density of the Earth and effectively calculated the value of the gravitational constant $G$ in 1798.

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Question #3

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

A. László Bíró

B. John Loud

C. Lewis Waterman

D. Rowland Hill

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Correct Answer: Option A

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

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