Who discovered the polio vaccine (Salk)? MCQ with Answer and Explanation

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Who discovered the polio vaccine (Salk)?

A. Albert Sabin

B. Louis Pasteur

C. Jonas Salk

D. Edward Jenner

Answer: Option C

Solution (By JKSSB Mock Tests)

Jonas Salk developed the inactivated polio vaccine.

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Who was the first to reach the deepest point in the ocean?

A. James Cameron

B. Jacques Piccard and Don Walsh

C. Victor Vescovo

D. Robert Ballard

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Correct Answer: Option B

Explanation:
They reached the Mariana Trench in the Trieste.

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Question #2

Which was the first country to issue postage stamps?

A. France

B. United States

C. United Kingdom

D. Germany

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Correct Answer: Option C

Explanation:
The United Kingdom issued the 'Penny Black', the world's first adhesive postage stamp, in 1840.

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Question #3

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

A. Expedition

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C. John Muir

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Correct Answer: Option B

Explanation:
1873 ascent.

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