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

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

A. Heinrich Hertz

B. Christian Doppler

C. Albert Einstein

D. Edwin Hubble

Answer: Option B

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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Who discovered the planet Pluto in 1930 at the Lowell Observatory?

A. William Herschel

B. Edwin Hubble

C. Clyde Tombaugh

D. Percival Lowell

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Correct Answer: Option C

Explanation:
Clyde Tombaugh discovered Pluto by comparing photographic plates using a blink comparator instrument.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who discovered the existence of the Van Allen Radiation Belts surrounding the Earth?

A. Wernher von Braun

B. Carl Sagan

C. Robert Goddard

D. James Van Allen

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Correct Answer: Option D

Explanation:
James Van Allen discovered the zones of trapped charged particles around Earth using data from the Explorer 1 satellite in 1958.

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Question #3

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The fundamental principle of fluid mechanics stating that internal pressure drops as fluid velocity increases was discovered by whom?

A. Archimedes

B. Blaise Pascal

C. Isaac Newton

D. Daniel Bernoulli

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Correct Answer: Option D

Explanation:
Daniel Bernoulli published Bernoulli's Principle in his book 'Hydrodynamica' in 1738.

This question belongs to: Static General Knowledge Inventions and Discoveries

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