Who discovered that light waves shift in frequency relative to the relative motion between the source and observer? MCQ with Answer and Explanation

Question
Who discovered that light waves shift in frequency relative to the relative motion between the source and observer?
A. Albert Einstein
B. Edwin Hubble
C. Heinrich Hertz
D. Christian Doppler
Answer: Option D
Solution (By JKSSB Mock Tests)
Christian Doppler proposed the Doppler Effect in 1842, which applies uniformly to both acoustic sound pitch adjustments and optical stellar shifts.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered the first known antibiotic substance produced by soil actinomycetes, Actinomycin?
A. Selman Waksman
B. Robert Koch
C. Louis Pasteur
D. Alexander Fleming
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Correct Answer: Option A

Explanation:
Selman Waksman and his student H. Boyd Woodruff isolated actinomycin in 1940, sparking targeted soil microbe screening programs.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
The invention of the iconic acoustic phonograph recording flat disc format (Gramophone) was developed by whom?
A. Emile Berliner
B. Thomas Edison
C. Alexander Graham Bell
D. Nikola Tesla
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Correct Answer: Option A

Explanation:
Emile Berliner introduced flat zinc discs with lateral groove tracking in 1887, outperforming Edison's hollow wax storage cylinders.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
The invention of the mechanical calculating machine named 'Pascaline' in 1642 was completed by whom?
A. Charles Babbage
B. Gottfried Wilhelm Leibniz
C. Blaise Pascal
D. René Descartes
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Correct Answer: Option C

Explanation:
Blaise Pascal invented the Pascaline to assist his father, a tax commissioner, in performing arithmetic addition and subtraction.
This question belongs to: Static General Knowledge Inventions and Discoveries
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