Who discovered the specific virus responsible for tobacco mosaic disease, launching the scientific discipline of Virology? MCQ with Answer and Explanation

Question

Who discovered the specific virus responsible for tobacco mosaic disease, launching the scientific discipline of Virology?

A. Alexander Fleming

B. Louis Pasteur

C. Robert Koch

D. Dmitri Ivanovsky and Martinus Beijerinck

Answer: Option D

Solution (By JKSSB Mock Tests)

Ivanovsky found that infected extracts remain contagious after chamber porcelain filtration; Beijerinck termed the fluid agent a 'virus'.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The invention of the lead-acid rechargeable battery in 1859, still used in automobiles today, was done by whom?

A. Thomas Edison

B. John Daniell

C. Gaston Planté

D. Alessandro Volta

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Correct Answer: Option C

Explanation:
French physicist Gaston Planté invented the lead-acid cell, the first chemical battery that could be recharged by reversing the current.

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Question #2

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Who invented the slide rule, an analog computing tool used extensively before electronic calculators?

A. Gottfried Leibniz

B. John Napier

C. Blaise Pascal

D. William Oughtred

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Correct Answer: Option D

Explanation:
William Oughtred invented the circular and rectilinear slide rule in the 1620s based on John Napier's logarithms.

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Question #3

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The invention of the common computing peripheral device known as the inkjet print mechanism was developed by which companies?

A. Canon and Hewlett-Packard teams

B. IBM

C. Xerox

D. Apple

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Correct Answer: Option A

Explanation:
Independent thermal bubble tracking research by Canon and HP in the late 1970s led to modern consumer inkjet printing.

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