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

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Who discovered the law of thermal radiation stating that emissivity equals absorptivity at thermal equilibrium?

A. Max Planck

B. Wilhelm Wien

C. Gustav Kirchhoff

D. Josef Stefan

Answer: Option C

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

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The ballistic missile (V-2 rocket) was primarily invented by which scientist?

A. Robert Goddard

B. Wernher von Braun

C. Hermann Oberth

D. Konstantin Tsiolkovsky

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Correct Answer: Option B

Explanation:
Wernher von Braun was the leading figure in the development of the V-2 rocket in Nazi Germany and later NASA space vehicles.

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Question #2

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The invention of the common lead pencil using graphite strips encased in wooden cylinders was patented in its modern form by whom?

A. Lewis Waterman

B. John Loud

C. Walter Hunt

D. Nicolas-Jacques Conté

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Correct Answer: Option D

Explanation:
Nicolas-Jacques Conté patented the process of mixing powdered graphite with clay and baking it to create modern pencil leads in 1795.

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Question #3

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Who invented the modern zipper mechanism with interlocking teeth in its final commercial form?

A. Whitcomb Judson

B. Elias Howe

C. Walter Hunt

D. Gideon Sundback

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Correct Answer: Option D

Explanation:
Gideon Sundback modified earlier primitive clasp locker designs into the modern 'Hookless Fastener' or zipper in 1913.

This question belongs to: Static General Knowledge Inventions and Discoveries

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