Who discovered the phenomenon of radioactivity in 1896? MCQ with Answer and Explanation

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Who discovered the phenomenon of radioactivity in 1896?

A. Wilhelm Röntgen

B. Henri Becquerel

C. Ernest Rutherford

D. Marie Curie

Answer: Option B

Solution (By JKSSB Mock Tests)

Henri Becquerel discovered radioactivity in 1896 while working with uranium salts, for which he shared the 1903 Nobel Prize in Physics.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

Who discovered the specific mathematical constant linking the energy of a photon to its frequency?

A. Max Planck

B. Werner Heisenberg

C. Niels Bohr

D. Albert Einstein

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Correct Answer: Option A

Explanation:
Max Planck discovered Planck's constant ($h$) as part of his derivation of blackbody radiation energy laws.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

Who discovered that yellow fever is transmitted by a specific mosquito species rather than direct human contact?

A. Carlos Finlay

B. Ronald Ross

C. Walter Reed

D. Louis Pasteur

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Correct Answer: Option C

Explanation:
Major Walter Reed led the commission that experimentally proved Carlos Finlay's theory that yellow fever is transmitted by the Aedes aegypti mosquito.

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Question #3

The invention of the mechanical calculating machine named 'Pascaline' in 1642 was completed by whom?

A. Charles Babbage

B. René Descartes

C. Blaise Pascal

D. Gottfried Wilhelm Leibniz

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Correct Answer: Option C

Explanation:
Blaise Pascal invented the Pascaline to assist his father, a tax commissioner, in performing arithmetic addition and subtraction.

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