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. Karl Schwarzschild
B. Albert Einstein
C. Stephen Hawking
D. Subrahmanyan Chandrasekhar
Answer: Option A
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 safety razor with disposable stamped steel blades was introduced by whom?
A. Walter Hunt
B. King Camp Gillette
C. Elisha Otis
D. John Loud

Correct Answer: Option B


Explanation:
King Camp Gillette patented the safety razor system with cheap, replaceable double-edged blades in 1904.

Question #2 Report Error
The invention of the common computing peripheral device known as the inkjet print mechanism was developed by which companies?
A. IBM
B. Apple
C. Xerox
D. Canon and Hewlett-Packard teams

Correct Answer: Option D


Explanation:
Independent thermal bubble tracking research by Canon and HP in the late 1970s led to modern consumer inkjet printing.

Question #3 Report Error
Who discovered the law of conservation of mass in chemical reactions?
A. Antoine Lavoisier
B. Robert Boyle
C. Joseph Priestley
D. John Dalton

Correct Answer: Option A


Explanation:
Antoine Lavoisier formulated the Law of Conservation of Mass in 1789, proving that mass is neither created nor destroyed in chemical transformations.