Who discovered the exact value of the charge of an electron through the famous Oil-Drop Experiment? MCQ with Answer and Explanation

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Who discovered the exact value of the charge of an electron through the famous Oil-Drop Experiment?

A. Max Planck

B. Ernest Rutherford

C. Robert Millikan

D. J.J. Thomson

Answer: Option C

Solution (By JKSSB Mock Tests)

Robert A. Millikan measured the elementary electric charge of electrons using balanced oil droplets in 1909.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered that the chemical element Iodine is isolated from seaweed ash matrices?

A. Bernard Courtois

B. Joseph Louis Gay-Lussac

C. Antoine Lavoisier

D. Humphry Davy

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Correct Answer: Option A

Explanation:
Bernard Courtois isolated violet iodine vapors accidentally in 1811 while adding excess sulfuric acid to seaweed extract solutions.

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Question #2

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

A. Birbal Sahni

B. C.V. Raman

C. Prafulla Chandra Ray

D. Jagadish Chandra Bose

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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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Question #3

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The expanding nature of the universe was discovered by which astronomer?

A. Edwin Hubble

B. Galileo Galilei

C. Johannes Kepler

D. Albert Einstein

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Correct Answer: Option A

Explanation:
Edwin Hubble discovered in 1929 that galaxies are moving away from each other, indicating that the universe is expanding.

This question belongs to: Static General Knowledge Inventions and Discoveries

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