Quiz2Know

Famous figures

Trailblazing Scientists and Inventors

Discover how well you know the revolutionary minds behind physics, biology, chemistry, and transformative technological inventions.

This is a free, 14-question multiple-choice quiz. Answer each question to see whether you got it right, with an explanation for every answer. There is no sign-up and no time limit — take it as many times as you like, and scroll down for the full answer key once you are done.

Question 1 of 14

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Who formulated the three laws of motion and the law of universal gravitation in his 1687 work 'Philosophiae Naturalis Principia Mathematica'?

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Answer key & explanations

Every question in this quiz, with the correct answer marked and an explanation of why it is right. Use it to revise before or after taking the quiz above.

  1. 1.Who formulated the three laws of motion and the law of universal gravitation in his 1687 work 'Philosophiae Naturalis Principia Mathematica'?

    • AGalileo Galilei
    • BJohannes Kepler
    • CIsaac Newton✓ Correct
    • DRobert Hooke

    Correct answer: Isaac Newton

    Sir Isaac Newton laid the classical foundation of mechanics, demonstrating that earthly and celestial bodies follow the same mathematical principles.

  2. 2.Which physicist proposed the special and general theories of relativity and won the 1921 Nobel Prize in Physics for the photoelectric effect?

    • AAlbert Einstein✓ Correct
    • BNiels Bohr
    • CMax Planck
    • DWerner Heisenberg

    Correct answer: Albert Einstein

    Albert Einstein revolutionized theoretical physics by describing the equivalence of mass and energy and the curvature of spacetime.

  3. 3.Who was the first person to win two Nobel Prizes in two different scientific fields (Physics and Chemistry)?

    • ALinus Pauling
    • BMarie Curie✓ Correct
    • CIrène Joliot-Curie
    • DDorothy Hodgkin

    Correct answer: Marie Curie

    Marie Skłodowska-Curie won in Physics in 1903 for research on radiation and in Chemistry in 1911 for discovering polonium and radium.

  4. 4.Which English naturalist published 'On the Origin of Species' in 1859, proposing evolution through natural selection?

    • AAlfred Russel Wallace
    • BThomas Henry Huxley
    • CCharles Lyell
    • DCharles Darwin✓ Correct

    Correct answer: Charles Darwin

    Charles Darwin gathered vital observations aboard HMS Beagle, developing a cohesive mechanism for how species adapt and diverge over time.

  5. 5.Who discovered the first widely used antibiotic, penicillin, after observing mold contaminating a petri dish of staphylococcus in 1928?

    • AAlexander Fleming✓ Correct
    • BHoward Florey
    • CErnst Chain
    • DEdward Jenner

    Correct answer: Alexander Fleming

    Alexander Fleming noticed that Penicillium notatum produced an antibacterial substance that dissolved surrounding bacterial colonies.

  6. 6.Which Serbian-American inventor developed the alternating current (AC) electrical system and the induction motor?

    • AThomas Edison
    • BNikola Tesla✓ Correct
    • CGeorge Westinghouse
    • DMichael Faraday

    Correct answer: Nikola Tesla

    Nikola Tesla patented key AC generation and transmission designs, which became the global standard for high-voltage power distribution.

  7. 7.Who is credited with creating the first widely accepted version of the Periodic Table of Elements in 1869, leaving gaps for undiscovered elements?

    • ADmitri Mendeleev✓ Correct
    • BAntoine Lavoisier
    • CJohn Newlands
    • DHenry Moseley

    Correct answer: Dmitri Mendeleev

    Dmitri Mendeleev organized elements by atomic weight and predicted the physical properties of then-unknown elements like gallium and germanium.

  8. 8.Which Scottish engineer patented a separate condenser in 1769 that dramatically improved the efficiency of the steam engine?

    • AThomas Newcomen
    • BJames Watt✓ Correct
    • CGeorge Stephenson
    • DRichard Trevithick

    Correct answer: James Watt

    James Watt prevented wasteful cooling and reheating of the engine cylinder, powering the industrial mechanization of factories and mines.

  9. 9.Who pioneered the use of the telescope for astronomical observation, discovering four major moons of Jupiter in 1610?

    • ATycho Brahe
    • BNicolaus Copernicus
    • CGalileo Galilei✓ Correct
    • DGiordano Bruno

    Correct answer: Galileo Galilei

    Galileo's telescopic discoveries of Jupiter's moons, lunar craters, and Venus's phases provided empirical evidence supporting heliocentrism.

  10. 10.Which French chemist and microbiologist disproved spontaneous generation and developed vaccines against rabies and anthrax?

    • ARobert Koch
    • BLouis Pasteur✓ Correct
    • CFerdinand Cohn
    • DJoseph Lister

    Correct answer: Louis Pasteur

    Louis Pasteur proved that microorganisms cause fermentation and disease, developing heat-treatment pasteurization to destroy pathogens in liquids.

  11. 11.Who is recognized as the world's first computer programmer for writing an algorithm intended for Charles Babbage's Analytical Engine?

    • AAda Lovelace✓ Correct
    • BGrace Hopper
    • CMary Somerville
    • DKatherine Johnson

    Correct answer: Ada Lovelace

    Ada Lovelace translated Luigi Menabrea's notes in 1843 and appended her own stepwise method to calculate Bernoulli numbers using the machine.

  12. 12.Which American brothers are credited with inventing, building, and flying the first successful motor-operated airplane in 1903?

    • AOrville and Wilbur Wright✓ Correct
    • BGlenn and Frank Curtiss
    • CCharles and Arthur Lindbergh
    • DJohn and James Montgomery

    Correct answer: Orville and Wilbur Wright

    The Wright brothers achieved the first controlled, sustained, and powered heavier-than-air flight at Kitty Hawk, North Carolina.

  13. 13.Who formulated the foundational equations of electromagnetism in the 1860s, showing that light is an electromagnetic wave?

    • AHeinrich Hertz
    • BJames Clerk Maxwell✓ Correct
    • CAndré-Marie Ampère
    • DHans Christian Ørsted

    Correct answer: James Clerk Maxwell

    James Clerk Maxwell unified electricity, magnetism, and optics into a coherent set of four partial differential equations.

  14. 14.Which Italian physicist invented the first chemical battery, known as the voltaic pile, in 1800?

    • ALuigi Galvani
    • BAlessandro Volta✓ Correct
    • CAmedeo Avogadro
    • DEvangelista Torricelli

    Correct answer: Alessandro Volta

    Alessandro Volta stacked alternating discs of zinc and copper separated by brine-soaked cloth, generating the first continuous electric current.

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