Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared? MCQ with Answer and Explanation

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Who discovered ultraviolet radiation in 1801, shortly after Herschel's discovery of infrared?

A. Heinrich Hertz

B. Johann Wilhelm Ritter

C. Wilhelm Röntgen

D. William Herschel

Answer: Option B

Solution (By JKSSB Mock Tests)

Johann Wilhelm Ritter discovered 'chemical rays' (ultraviolet light) by observing how silver chloride reacted to invisible rays past the violet spectrum.

This question belongs to: Static General Knowledge Inventions and Discoveries

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The invention of the common maritime navigation safety equipment known as the Fresnel Lens was optimized for what?

A. Telescopes

B. Sailing sextants

C. Submarines

D. Lighthouses

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Correct Answer: Option D

Explanation:
Augustin-Jean Fresnel engineered stepped composite rings that focused lighthouse lamp light into parallel beams visible across oceans.

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Question #2

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Who invented the electrocardiogram (ECG/EKG) device, winning a Nobel Prize in 1924?

A. Willem Einthoven

B. Alexander Fleming

C. Hans Berger

D. Robert Koch

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Correct Answer: Option A

Explanation:
Willem Einthoven invented the first practical electrocardiogram in 1903 and received the Nobel Prize for it.

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Question #3

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Who discovered the presence of the cosmic entity known as the black hole through mathematical solutions to General Relativity equations?

A. Karl Schwarzschild

B. Subrahmanyan Chandrasekhar

C. Stephen Hawking

D. Albert Einstein

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Correct Answer: Option A

Explanation:
Karl Schwarzschild derived the exact solution for spherical non-rotating point mass objects in 1915, outlining the event horizon radius.

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