Who discovered that the Earth's core is divided into solid inner and liquid outer layers? MCQ with Answer and Explanation

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Who discovered that the Earth's core is divided into solid inner and liquid outer layers?

A. Beno Gutenberg

B. Inge Lehmann

C. Andrija Mohorovičić

D. Charles Richter

Answer: Option B

Solution (By JKSSB Mock Tests)

Danish seismologist Inge Lehmann discovered the Earth's solid inner core in 1936 by studying seismic wave travel paths.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

Who discovered the first human virus ever identified, the Yellow Fever virus?

A. Louis Pasteur

B. Robert Koch

C. Dmitri Ivanovsky

D. Walter Reed and his team

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Correct Answer: Option D

Explanation:
The U.S. Army Yellow Fever Commission led by Walter Reed isolated and proved the disease was caused by a filterable virus vector.

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Question #2

Who discovered the fundamental principle of inheritance known as the Law of Independent Assortment?

A. Charles Darwin

B. Francis Crick

C. Gregor Mendel

D. Thomas Hunt Morgan

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Correct Answer: Option C

Explanation:
Gregor Mendel discovered the laws of segregation and independent assortment through careful calculation of pea hybrid phenotypes.

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Question #3

The invention of the common mechanical device known as the marine depth tracker Echo Sounder was patented by whom?

A. Heinrich Hertz

B. Alexander Behm

C. Guglielmo Marconi

D. Robert Watson-Watt

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Correct Answer: Option B

Explanation:
German physicist Alexander Behm patented the sonic echo sounder depth locator apparatus in 1912 to prevent marine collisions.

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