Who discovered radioactivity? MCQ with Answer and Explanation

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Who discovered radioactivity?

A. Ernest Rutherford

B. Marie Curie

C. Pierre Curie

D. Henri Becquerel

Answer: Option D

Solution (By JKSSB Mock Tests)

Henri Becquerel discovered radioactivity in 1896.

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Question #1

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Who was the first to reach the summit of Mount Eisenhower?

A. Modern

B. Historical

C. Local

D. Expedition

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Correct Answer: Option C

Explanation:
Early ascents.

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Question #2

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Which was the first civilization to develop a calendar?

A. Babylonians

B. Mayans

C. Egyptians

D. Sumerians

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Correct Answer: Option C

Explanation:
The ancient Egyptians developed one of the first known calendars based on the flooding of the Nile.

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Question #3

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Who was the first person to calculate the speed of light?

A. Albert Einstein

B. Galileo Galilei

C. Ole Rømer

D. Isaac Newton

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Correct Answer: Option C

Explanation:
Ole Rømer made the first quantitative measurement of the speed of light in 1676.

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