Who discovered that the element Uranium emits invisible energy streams, opening the radioactive field before Marie Curie? MCQ with Answer and Explanation

Question

Who discovered that the element Uranium emits invisible energy streams, opening the radioactive field before Marie Curie?

A. Henri Becquerel

B. Ernest Rutherford

C. J.J. Thomson

D. Wilhelm Röntgen

Answer: Option A

Solution (By JKSSB Mock Tests)

Becquerel left uranium compounds in a dark desk drawer with unexposed photographic plates, discovering they fogged without light exposure.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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Who discovered that magnetic fields can split atomic spectral emission lines, a phenomenon known as the Zeeman Effect?

A. Pieter Zeeman

B. Johannes Stark

C. Hendrik Lorentz

D. Max Planck

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Correct Answer: Option A

Explanation:
Zeeman discovered the magnetic line splitting in 1896, which Lorentz explained theoretically, earning them a shared 1902 Nobel Prize.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Alexander Fleming discovered penicillin, the world's first effective antibiotic, in which year?

A. 1935

B. 1928

C. 1918

D. 1942

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Correct Answer: Option B

Explanation:
Sir Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital, London, after noticing a mold contaminating a petridish of staphylococci.

This question belongs to: Static General Knowledge Inventions and Discoveries