Who discovered that cosmic celestial entities emit radio signals, establishing the branch of Radio Astronomy? MCQ with Answer and Explanation

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Who discovered that cosmic celestial entities emit radio signals, establishing the branch of Radio Astronomy?

A. Karl Jansky

B. Grote Reber

C. Edwin Hubble

D. Guglielmo Marconi

Answer: Option A

Solution (By JKSSB Mock Tests)

Jansky discovered radio emission noise origins from the galactic center in 1931 using directional rotating antenna arrays at Bell Labs.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who discovered insulin, saving millions of lives affected by diabetes?

A. Robert Koch

B. Edward Jenner

C. Alexander Fleming

D. Frederick Banting and Charles Best

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Correct Answer: Option D

Explanation:
Sir Frederick Banting, along with Charles Best and John Macleod, isolated insulin in 1921-1922.

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Question #2

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Who discovered that certain types of mold produce enzymes that slice viral genetic strains, known as CRISPR-Cas9 genome editing?

A. Alec Jeffreys

B. James Watson

C. Kary Mullis

D. Emmanuelle Charpentier and Jennifer Doudna

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Correct Answer: Option D

Explanation:
Charpentier and Doudna adapted the bacterial immune mechanism into an exceptionally precise genetic engineering tool, winning the 2020 Nobel Prize.

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Question #3

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The discovery of the charge-coupled device (CCD), which replaces film with digital sensor pixels in cameras, was made by whom?

A. Willard Boyle and George E. Smith

B. Fujio Masuoka

C. Charles Kao

D. Theodore Maiman

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Correct Answer: Option A

Explanation:
Boyle and Smith invented the CCD at Bell Labs in 1969, fundamentally altering digital imaging, which won them a 2009 Nobel Prize.

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