Who discovered that certain types of biological viruses infect and replicate exclusively inside bacterial cell hosts, establishing 'Bacteriophages'? MCQ with Answer and Explanation

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Who discovered that certain types of biological viruses infect and replicate exclusively inside bacterial cell hosts, establishing 'Bacteriophages'?

A. Louis Pasteur

B. Frederick Twort and Félix d'Hérelle

C. Dmitri Ivanovsky

D. Robert Koch

Answer: Option B

Solution (By JKSSB Mock Tests)

Twort and d'Hérelle independently isolated filterable bacterial lysis agents, establishing early phage therapeutic concepts.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common marine engineering structure known as the modern offshore oil drilling rig platform was pioneered by whom?

A. Alden J. Laborde

B. Robert Fulton

C. John Ericsson

D. Charles Parsons

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Correct Answer: Option A

Explanation:
Laborde designed 'Mr. Charlie' in 1953, the first transportable, submersible offshore drilling rig that launched deep-sea oil exploration.

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Question #2

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The invention of the modern mechanical reaper, which automated grain harvesting, was patented by whom?

A. Eli Whitney

B. Cyrus McCormick

C. James Hargreaves

D. John Deere

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Correct Answer: Option B

Explanation:
Cyrus McCormick patented the horse-drawn mechanical reaper in 1834, transforming agricultural output.

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Question #3

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Who discovered that the speed of light is constant in all inertial frames of reference, forming the basis of Special Relativity?

A. Albert Michelson

B. Hendrik Lorentz

C. Max Planck

D. Albert Einstein

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Correct Answer: Option D

Explanation:
Albert Einstein postulated that the speed of light in a vacuum is invariant, irrespective of the motion of the source or observer.

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