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

Question
Who discovered that the Earth's core is divided into solid inner and liquid outer layers?
A. Beno Gutenberg
B. Charles Richter
C. Andrija Mohorovičić
D. Inge Lehmann
Answer: Option D
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 that biological chromosomes carry the unique hereditary factor tracking layouts, establishing Chromosome Theory?
A. Gregor Mendel
B. Thomas Hunt Morgan
C. Walter Sutton and Theodor Boveri
D. James Watson
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Correct Answer: Option C

Explanation:
Sutton and Boveri independently identified in 1902 that chromosome pairing and separation match Mendelian inheritance laws.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered that the genetic molecule DNA can transition between stable 'A' and 'B' structural forms depending on relative humidity levels?
A. Francis Crick
B. Rosalind Franklin
C. Maurice Wilkins
D. James Watson
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Correct Answer: Option B

Explanation:
Franklin's meticulous control of humidity during X-ray diffraction isolation yielded the highly detailed 'B-form' structural patterns.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered the biological mechanism of vector cloning known as Polymerase Chain Reaction (PCR)?
A. Kary Mullis
B. Alec Jeffreys
C. Francis Crick
D. James Watson
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Correct Answer: Option A

Explanation:
Kary Mullis conceived the thermal cycling enzyme replication process to rapidly amplify specific DNA strands in 1983.
This question belongs to: Static General Knowledge Inventions and Discoveries
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