Inventions and Discoveries MCQs with Answers and Explanations

Question #1

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Who discovered the phenomenon of radioactivity in 1896?

A. Wilhelm Röntgen

B. Henri Becquerel

C. Ernest Rutherford

D. Marie Curie

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Correct Answer: Option B

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 electron was discovered in 1897 by which of the following physicists?

A. John Dalton

B. J.J. Thomson

C. James Chadwick

D. Ernest Rutherford

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Correct Answer: Option B

Explanation:
J.J. Thomson discovered the electron through his experiments with cathode ray tubes in 1897.

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Question #3

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Who is credited with the invention of the World Wide Web (WWW) in 1989?

A. Alan Turing

B. Tim Berners-Lee

C. Bill Gates

D. Vint Cerf

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Correct Answer: Option B

Explanation:
Tim Berners-Lee invented the World Wide Web in 1989 while working at CERN.

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Question #4

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The X-ray was discovered in 1895 by which Nobel laureate?

A. Albert Einstein

B. Wilhelm Röntgen

C. Max Planck

D. Niels Bohr

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Correct Answer: Option B

Explanation:
Wilhelm Röntgen discovered X-rays in 1895 and received the first-ever Nobel Prize in Physics in 1901.

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Question #5

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Who developed the first successful polio vaccine in 1955?

A. Louis Pasteur

B. Albert Sabin

C. Edward Jenner

D. Jonas Salk

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Correct Answer: Option D

Explanation:
Jonas Salk developed the first successful inactivated polio vaccine (IPV) in 1955, while Albert Sabin later developed the oral polio vaccine.

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Question #6

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

A. 1935

B. 1918

C. 1928

D. 1942

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Correct Answer: Option C

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

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Question #7

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Who formulated the Laws of Planetary Motion?

A. Galileo Galilei

B. Johannes Kepler

C. Isaac Newton

D. Nicolaus Copernicus

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Correct Answer: Option B

Explanation:
Johannes Kepler formulated the three laws of planetary motion in the early 17th century.

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Question #8

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The periodic table of elements was first proposed in its widely recognized chronological form by whom?

A. John Newlands

B. Antoine Lavoisier

C. Henry Moseley

D. Dmitri Mendeleev

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Correct Answer: Option D

Explanation:
Dmitri Mendeleev published the first widely recognized periodic table in 1869, arranging elements by atomic mass.

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Question #9

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Who invented the safety elevator in 1852, which prevented the cab from falling if the cable broke?

A. Thomas Edison

B. Henry Bessemer

C. James Watt

D. Elisha Otis

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Correct Answer: Option D

Explanation:
Elisha Otis invented the elevator safety brake in 1852, making skyscrapers practical and safe.

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Question #10

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The blood group system (A, B, O) was discovered by which scientist?

A. Karl Landsteiner

B. Robert Koch

C. William Harvey

D. Edward Jenner

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Correct Answer: Option A

Explanation:
Karl Landsteiner discovered the ABO blood groups in 1900, for which he received the Nobel Prize in Physiology or Medicine in 1930.

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Question #11

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Who discovered the neutron in the year 1932?

A. Niels Bohr

B. James Chadwick

C. Ernest Rutherford

D. J.J. Thomson

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Correct Answer: Option B

Explanation:
James Chadwick discovered the neutron in 1932, proving its existence as a neutral particle in the nucleus.

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Question #12

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The invention of the dynamite is credited to which Swedish chemist?

A. Alfred Nobel

B. Svante Arrhenius

C. Jöns Jacob Berzelius

D. Carl Wilhelm Scheele

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Correct Answer: Option A

Explanation:
Alfred Nobel invented dynamite in 1867, and later used his enormous fortune to institute the Nobel Prizes.

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Question #13

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Who discovered insulin, saving millions of lives affected by diabetes?

A. Robert Koch

B. Edward Jenner

C. Alexander Fleming

D. Frederick Banting and Charles Best

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Correct Answer: Option D

Explanation:
Sir Frederick Banting, along with Charles Best and John Macleod, isolated insulin in 1921-1922.

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Question #14

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Who invented the mercury thermometer in 1714?

A. Lord Kelvin

B. Daniel Gabriel Fahrenheit

C. Galileo Galilei

D. Anders Celsius

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Correct Answer: Option B

Explanation:
Daniel Gabriel Fahrenheit invented the mercury-in-glass thermometer in 1714 and developed the Fahrenheit scale.

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Question #15

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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. Barbara McClintock

B. Rosalind Franklin

C. Dorothy Hodgkin

D. Marie Curie

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Correct Answer: Option B

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

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Question #16

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Who invented the lightning rod and bifocal lenses?

A. Michael Faraday

B. Benjamin Franklin

C. Thomas Edison

D. Nikola Tesla

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Correct Answer: Option B

Explanation:
Benjamin Franklin invented the lightning rod, bifocal spectacles, and the Franklin stove.

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Question #17

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Who discovered circulation of blood in the human body?

A. Karl Landsteiner

B. William Harvey

C. Andreas Vesalius

D. Robert Hooke

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Correct Answer: Option B

Explanation:
William Harvey was an English physician who correctly described the systemic circulation and properties of blood being pumped to the brain and body by the heart.

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Question #18

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

A. Robert Hooke

B. Anton van Leeuwenhoek

C. Theodor Schwann

D. Matthias Schleiden

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Correct Answer: Option A

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 #19

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Who invented the first working internal combustion engine powered by gasoline?

A. Karl Benz

B. Henry Ford

C. Nikolaus Otto

D. Rudolf Diesel

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Correct Answer: Option A

Explanation:
Karl Benz is widely acknowledged as the inventor of the modern gasoline-powered automobile (1885/1886) using an internal combustion engine.

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Question #20

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Who discovered the law of hereditary transmission through experiments on pea plants?

A. Gregor Mendel

B. Thomas Hunt Morgan

C. Charles Darwin

D. Jean-Baptiste Lamarck

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Correct Answer: Option A

Explanation:
Gregor Mendel is known as the father of modern genetics for his discovery of the basic laws of heredity through breeding pea plants.

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