Who discovered the law of thermal radiation stating that emissivity equals absorptivity at thermal equilibrium? MCQ with Answer and Explanation

Question
Who discovered the law of thermal radiation stating that emissivity equals absorptivity at thermal equilibrium?
A. Gustav Kirchhoff
B. Max Planck
C. Josef Stefan
D. Wilhelm Wien
Answer: Option A
Solution (By JKSSB Mock Tests)
Gustav Kirchhoff formulated Kirchhoff's Law of Thermal Radiation in 1859, standardizing spectroscopy and thermodynamic modeling.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who discovered that the planet Saturn has a prominent ring system and its largest moon, Titan?
A. William Herschel
B. Giovanni Cassini
C. Christiaan Huygens
D. Galileo Galilei
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Correct Answer: Option C

Explanation:
Christiaan Huygens correctly identified Saturn's rings in 1655 and discovered its largest moon, Titan.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who is credited with the invention of the telephone in 1876?
A. Elisha Gray
B. Alexander Graham Bell
C. Thomas Edison
D. Guglielmo Marconi
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Correct Answer: Option B

Explanation:
Alexander Graham Bell received the first US patent for the telephone in March 1876.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered that solar light presentation presents distinct missing dark absorptive band lines, establishing the Fraunhofer Lines?
A. Gustav Kirchhoff
B. Joseph von Fraunhofer and William Hyde Wollaston
C. Robert Bunsen
D. Isaac Newton
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Correct Answer: Option B

Explanation:
Wollaston observed early dark bands, and Fraunhofer mapped over 570 lines precisely using customized optical spectroscopes in 1814.
This question belongs to: Static General Knowledge Inventions and Discoveries
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