The structure of DNA was discovered in 1953 by James Watson and Francis Crick with the crucial aid of data from whom? MCQ with Answer and Explanation

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The structure of DNA was discovered in 1953 by James Watson and Francis Crick with the crucial aid of data from whom?

A. Dorothy Hodgkin

B. Barbara McClintock

C. Marie Curie

D. Rosalind Franklin

Answer: Option D

Solution (By JKSSB Mock Tests)

Rosalind Franklin's X-ray diffraction images (particularly Photo 51) were key to identifying the double-helix structure of DNA.

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Who discovered the phenomenon of radioactivity in 1896?

A. Ernest Rutherford

B. Wilhelm Röntgen

C. Marie Curie

D. Henri Becquerel

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Correct Answer: Option D

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

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Question #2

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The cell was first discovered and named by whom in 1665?

A. Anton van Leeuwenhoek

B. Matthias Schleiden

C. Theodor Schwann

D. Robert Hooke

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Correct Answer: Option D

Explanation:
Robert Hooke discovered plant cells in cork tissue under a primitive microscope in 1665 and coined the term 'cell'.

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Question #3

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The invention of the machine gun is historically associated with which American inventor?

A. John Browning

B. Samuel Colt

C. Oliver Winchester

D. Richard Gatling

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Correct Answer: Option D

Explanation:
Richard Gatling invented the Gatling gun, the first highly successful rapid-fire multi-barrel machine gun, during the American Civil War.

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