Who discovered that the chemical element Argon exists as an unreactive atmospheric component, launching the noble gas group? MCQ with Answer and Explanation

Question

Who discovered that the chemical element Argon exists as an unreactive atmospheric component, launching the noble gas group?

A. Joseph Priestley

B. Lord Rayleigh and William Ramsay

C. Daniel Rutherford

D. Henry Cavendish

Answer: Option B

Solution (By JKSSB Mock Tests)

Rayleigh and Ramsay isolated argon in 1894 by removing all oxygen, nitrogen, and carbon dioxide from air samples.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who developed the first successful polio vaccine in 1955?

A. Louis Pasteur

B. Jonas Salk

C. Edward Jenner

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Correct Answer: Option B

Explanation:
Jonas Salk developed the first successful inactivated polio vaccine (IPV) in 1955, while Albert Sabin later developed the oral polio vaccine.

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Who discovered that the velocity of falling objects is completely independent of their weight in a vacuum?

A. Johannes Kepler

B. Aristotle

C. Isaac Newton

D. Galileo Galilei

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Correct Answer: Option D

Explanation:
Galileo mathematically disproved Aristotle's weight-proportional velocity model via rigorous acceleration measurements down inclined tracks.

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Question #3

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The Crescograph, a device to measure the growth and response of plants, was invented by whom?

A. Birbal Sahni

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Correct Answer: Option D

Explanation:
Sir Jagadish Chandra Bose invented the crescograph in the early 20th century to prove that plants have feelings and react to stimuli.

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