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. J.J. Thomson

B. Robert Millikan

C. Ernest Rutherford

D. Max Planck

Answer: Option B

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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The discovery of the first gas giant exoplanet orbiting a sun-like star (51 Pegasi b) was made by whom?

A. Carl Sagan

B. Clyde Tombaugh

C. Edwin Hubble

D. Michel Mayor and Didier Queloz

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Correct Answer: Option D

Explanation:
Michel Mayor and Didier Queloz discovered 51 Pegasi b in 1995 using highly precise radial velocity measurements, winning a Nobel Prize.

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Question #2

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Who discovered that the speed of chemical reactions increases when specific non-consumed agents are added, coining the term 'Catalysis'?

A. Antoine Lavoisier

B. Jöns Jacob Berzelius

C. Robert Boyle

D. Wilhelm Ostwald

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Correct Answer: Option B

Explanation:
Berzelius identified chemical catalytic force in 1835, which Ostwald later formalized thermodynamically.

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Question #3

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Who invented the first practical mechanical television system?

A. Vladimir Zworykin

B. Guglielmo Marconi

C. Philo Farnsworth

D. John Logie Baird

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Correct Answer: Option D

Explanation:
John Logie Baird demonstrated the first working mechanical television system in the 1920s.

This question belongs to: Static General Knowledge Inventions and Discoveries

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