Who discovered the presence of the cosmic entity known as the black hole through mathematical solutions to General Relativity equations? MCQ with Answer and Explanation

Who discovered the presence of the cosmic entity known as the black hole through mathematical solutions to General Relativity equations?
A. Stephen Hawking
B. Albert Einstein
C. Subrahmanyan Chandrasekhar
D. Karl Schwarzschild
Answer: Option D
Solution (By JKExamLibrary)
Karl Schwarzschild derived the exact solution for spherical non-rotating point mass objects in 1915, outlining the event horizon radius.

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Practice More Inventions and Discoveries Questions

Question #1 Report Error
The invention of the common kitchen refrigeration insulation system known as the domestic electric refrigerator was scaled by which engineer?
A. Willis Carrier
B. Thomas Edison
C. James Dewar
D. Fred W. Wolf and Nathaniel B. Wales

Correct Answer: Option D


Explanation:
Wolf invented early air-cooled attachment refrigerator units in 1913, and Wales engineered units that Kelvinator mass-marketed.

Question #2 Report Error
Who discovered that solar light presentation presents distinct missing dark absorptive band lines, establishing the Fraunhofer Lines?
A. Robert Bunsen
B. Isaac Newton
C. Joseph von Fraunhofer and William Hyde Wollaston
D. Gustav Kirchhoff

Correct Answer: Option C


Explanation:
Wollaston observed early dark bands, and Fraunhofer mapped over 570 lines precisely using customized optical spectroscopes in 1814.

Question #3 Report Error
Who discovered that certain elements change identities through radioactive transmutation, establishing the laws of radioactive decay?
A. Marie Curie
B. Ernest Rutherford and Frederick Soddy
C. Henri Becquerel
D. Otto Hahn

Correct Answer: Option B


Explanation:
Rutherford and Soddy formulated the decay transformation principles, proving elements naturally break down into different elements.